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200
136
60
60
60
60
75
25
DR FUEL DELIVERY - GAS (Continued)
FUEL DELIVERY - GAS
14 - 5
DESCRIPTION
Map Sensor Mounting
Screws - 4.7L
Map Sensor Mounting
Screws - 5.9L
Map Sensor Mounting
Screws - 8.0L
PCM-to-Mounting Bracket
Mounting Screws
Power Steering Pressure
Switch - 3.7L
Power Steering Pressure
Switch - 4.7L
TPS Mounting Screws -
3.7L
TPS Mounting Screws -
4.7L
TPS Mounting Screws -
5.9L
TPS Mounting Screws -
8.0L
Throttle Body Mounting
Bolts - 3.7L
Throttle Body Mounting
Bolts - 4.7L
Throttle Body Mounting
Bolts - 5.7L
Throttle Body Mounting
Bolts - 5.9L
Throttle Body Mounting
Bolts - 8.0L
Oxygen Sensors
SPECIAL TOOLS
FUEL SYSTEM
N-m
Ft. Lbs.
In. Lbs.
14-22
14-22
11
12
12
23
22
30
22
25
25
20
35
124-195
124-195
60
60
60
60
100
105
105
200
192
FUELPRESSURETESTER-#8978
TESTKIT,FUELPRESSURE,8.0LENGINE-#5069
FUEL DELIVERY - GAS
14 - 6
FUEL DELIVERY - GAS (Continued)ADAPTERS,FUELPRESSURETEST,8.0L-#6539
AND/OR#6631
DR
FUEL FILTER/PRESSURE REGULATOR DESCRIPTION
A combination fuel filter and fuel pressure regula- tor (Fig. 2) is used on all engines. It is located on the top of the fuel pump module. A separate frame mounted fuel filter is not used with any engine.
Both fuel filters (at bottom of fuel pump module and within fuel pressure regulator) are designed for extended service. They do not require normal sched- uled maintenance. Filters should only be replaced if a diagnostic procedure indicates to do so.
SPANNERWRENCH-#6856
FITTING,AIRMETERING-#6714
Fig.2SIDEVIEW-FILTER/REGULATOR
1 - INTERNAL FUEL FILTER 2 - FUEL FLOW TO FUEL INJECTORS 3 - FUEL FILTER/FUEL PRESSURE REGULATOR 4 - EXCESS FUEL BACK TO TANK 5 - FUEL INLET 6 - RUBBER GROMMET 7 - TOP OF PUMP MODULE
O2S(OXYGENSENSOR)REMOVER/INSTALLER-
#C-4907
OPERATION
Fuel Pressure Regulator Operation: The pres- sure regulator is a mechanical device that is not con- trolled by engine vacuum or the Powertrain Control Module (PCM).
The regulator is calibrated to maintain fuel system operating pressure of approximately 339 kPa ± 34
kPa (49.2 psi ± 5 psi) at the fuel injectors. It contains a diaphragm, calibrated springs and a fuel return valve. The internal fuel filter (Fig. 2) is also part of the assembly.Fuel is supplied to the filter/regulator by the elec- tric fuel pump through an opening tube at the bot- tom of filter/regulator (Fig. 2).
The regulator acts as a check valve to maintain some fuel pressure when the engine is not operating. This will help to start the engine. A second check valve is located at the outlet end of the electric fuel
DR FUEL FILTER/PRESSURE REGULATOR (Continued)
FUEL DELIVERY - GAS
14 - 7
pump. Refer to Fuel Pump - Description and Operation for more information.
If fuel pressure at the pressure regulator exceeds approximately 49.2 psi, an internal diaphragm opens and excess fuel pressure is routed back into the tank through the bottom of pressure regulator.
Both fuel filters (at bottom of fuel pump module and within fuel pressure regulator) are designed for extended service. They do not require normal sched- uled maintenance. Filters should only be replaced if a diagnostic procedure indicates to do so.
FUEL LEVEL SENDING UNIT / SENSOR DESCRIPTION
The fuel gauge sending unit (fuel level sensor) is attached to the side of the fuel pump module. The sending unit consists of a float, an arm, and a vari- able resistor track (card).
OPERATION
The fuel pump module has 4 different circuits (wires). Two of these circuits are used for the fuel gauge sending unit for fuel gauge operation, and for certain OBD II emission requirements. The other 2
wires are used for electric fuel pump operation.For Fuel Gauge Operation: A constant current source is supplied to the resistor track on the fuel gauge sending unit. This is fed directly from the Powertrain Control Module (PCM). NOTE: For diagnostic purposes, this 12V power source can only be verified with the circuit opened (fuel pump module electrical connector unplugged). With the connectors plugged, output voltages will vary from about 0.6 volts at FULL, to about 8.6 volts at EMPTY (about 8.6 volts at EMPTY for Jeep models, and about 7.0 volts at EMPTY for Dodge Truck models). The resistor track is used to vary the voltage (resistance) depending on fuel tank float level. As fuel level increases, the float and arm move up, which decreases voltage. As fuel level decreases, the float and arm move down, which increases voltage. The varied voltage signal is returned back to the PCM through the sensor return circuit.
Both of the electrical circuits between the fuel gauge sending unit and the PCM are hard-wired (not multi-plexed). After the voltage signal is sent from the resistor track, and back to the PCM, the PCM will interpret the resistance (voltage) data and send a message across the multi-plex bus circuits to the instrument panel cluster. Here it is translated into the appropriate fuel gauge level reading. Refer to Instrument Panel for additional information.
For OBD II Emission Monitor Requirements: The PCM will monitor the voltage output sent from the resistor track on the sending unit to indicate fuel level. The purpose of this feature is to prevent the OBD II system from recording/setting false misfire and fuel system monitor diagnostic trouble codes. The feature is activated if the fuel level in the tank is less than approximately 15 percent of its rated capacity. If equipped with a Leak Detection Pump (EVAP system monitor), this feature will also be acti- vated if the fuel in the tank is more than approximately 85 percent of its rated capacity.
level
REMOVAL
The fuel level sending unit (fuel level sensor) and float assembly is located on the side of the fuel pump module (Fig. 3).
(1) Remove fuel pump module from fuel tank.
Refer to Fuel Pump Module Removal/Installation.
(2) To remove sending unit from pump module, lift on plastic locking tab (Fig. 4) while sliding sending unit tracks.
(3) Disconnect 4–wire electrical connector (Fig. 3) from fuel pump module. Separate necessary sending unit wiring from connector using terminal pick / removal tool. Refer to Special Tools in 8W Wiring for tool part numbers.
Fig.3LOCATION-FUELGAUGESENDINGUNIT
1 - FUEL FILTER / FUEL PRESSURE REGULATOR 2 - FUEL PUMP MODULE ASSEMBLY 3 - 4-WAY ELEC. CONNECT. 4 - FLOAT ARM 5 - ELEC. FUEL PUMP 6 - INLET FILTER 7 - FUEL GAUGE SENDING UNIT 8 - GASKET (SEAL)
FUEL DELIVERY - GAS
14 - 8
FUEL LEVEL SENDING UNIT / SENSOR (Continued)DR
prevent the edge of the clamp from cutting into the hose. Only these rolled edge type clamps may be used in this system. All other types of clamps may cut into the hoses and cause high-pressure fuel leaks.
Use new original equipment type hose clamps.
QUICK CONNECT FITTING DESCRIPTION
Different types of quick-connect fittings are used to attach various fuel system components, lines and tubes. These are: a single-tab type, a two-tab type or a plastic retainer ring type. Some are equipped with safety latch clips. Some may require the use of a spe- cial tool for disconnection and removal. Refer to Quick-Connect Fittings Removal/Installation for more information.
CAUTION: The interior components (o-rings, clips) of quick-connect fittings are not serviced sepa- rately, but new plastic spacers are available for some types. If service parts are not available, do not attempt to repair the damaged fitting or fuel line (tube). If repair is necessary, replace the complete fuel line (tube) assembly.
STANDARD PROCEDURE - QUICK-CONNECT FITTINGS
Also refer to Fuel Tubes/Lines/Hoses and Clamps. Different types of quick-connect fittings are used to attach various fuel system components, lines and tubes. These are: a single-tab type, a two-tab type or a plastic retainer ring type. Safety latch clips are used on certain components/lines. Certain fittings may require use of a special tool for disconnection.
Fig.4FUELGAUGESENDINGUNIT-R/I
1 - SENDING UNIT 2 - LOCK TAB 3 - TRACKS 4 - NOTCH
INSTALLATION
(1) Connect necessary wiring into electrical con- nectors. Connect 4–wire electrical connector to pump module.
(2) Position sending unit to pump module. Slide
and snap into place.
(3) Install fuel pump module. Refer to Fuel Pump
Module Removal/Installation.
FUEL LINES DESCRIPTION
Also refer to Quick-Connect Fittings.
DISCONNECTING
WARNING: THE FUEL SYSTEM MAY BE UNDER A CONSTANT PRESSURE (EVEN WITH THE ENGINE OFF). BEFORE SERVICING ANY FUEL SYSTEM HOSES, FITTINGS, LINES, OR MOST COMPO- NENTS, FUEL SYSTEM PRESSURE MUST BE RELEASED. REFER TO THE FUEL SYSTEM PRES- SURE RELEASE PROCEDURE.
The lines/tubes/hoses used on fuel injected vehicles are of a special construction. This is due to the higher fuel pressures and the possibility of contami- nated fuel in this system. If it is necessary to replace these lines/tubes/hoses, only those marked EFM/EFI may be used.
If equipped: The hose clamps used to secure rub- ber hoses on fuel injected vehicles are of a special rolled edge construction. This construction is used to
WARNING: THE FUEL SYSTEM IS UNDER A CON- STANT PRESSURE (EVEN WITH ENGINE OFF). BEFORE SERVICING ANY FUEL SYSTEM HOSE, FITTING OR LINE, FUEL SYSTEM PRESSURE MUST BE RELEASED. REFER TO FUEL SYSTEM PRES- SURE RELEASE PROCEDURE.
CAUTION: The interior components (o-rings, spac- ers) of some types of quick-connect fitting are not serviced separately. If service parts are not avail- able, do not attempt to repair a damaged fitting or fuel If repair is necessary, replace complete fuel line assembly.
line.
(1) Perform fuel pressure release procedure. Refer
to Fuel Pressure Release Procedure.
DR QUICK CONNECT FITTING (Continued)
FUEL DELIVERY - GAS
14 - 9
(2) Disconnect negative battery cable from battery. (3) Clean fitting of any foreign material before dis-
assembly.
(4) 2–Button Type Fitting: This type of fitting is equipped with a push-button located on each side of quick-connect fitting (Fig. 5). Press on both buttons simultaneously for removal. Special tools are not required for disconnection.
Fig.6PINCHTYPEQUICK-CONNECTFITTING
1 - QUICK-CONNECT FITTINGS 2 - PINCH TABS
Fig.52-BUTTONTYPEFITTING
1 - QUICK-CONNECT FITTING 2 - PUSH-BUTTONS (2)
(5) Pinch-Type Fitting: This fitting is equipped with two finger tabs. Pinch both tabs together while removing fitting (Fig. 6). Special tools are not required for disconnection.
(6) Single-Tab Type Fitting: This type of fitting is equipped with a single pull tab (Fig. 7). The tab is removable. After tab is removed, quick-connect fitting can be separated from fuel system component. Spe- cial tools are not required for disconnection.
(a) Press release tab on side of fitting to release pull tab (Fig. 8). If release tab is not pressed prior to releasing pull tab, pull tab will be damaged.
(b) While pressing release tab on side of fitting,
use screwdriver to pry up pull tab (Fig. 8).
(c) Raise pull tab until it separates from quick-
connect fitting (Fig. 9). (7) Two-Tab Type Fitting: This type of fitting is equipped with tabs located on both sides of fitting (Fig. 10). The tabs are supplied for disconnecting quick-connect fitting from component being serviced. (a) To disconnect quick-connect fitting, squeeze plastic retainer tabs (Fig. 10) against sides of quick-connect fitting with your fingers. Tool use is
Fig.7SINGLE-TABTYPEFITTING
1 - PULL TAB 2 - QUICK-CONNECT FITTING 3 - PRESS HERE TO REMOVE PULL TAB 4 - INSERTED TUBE END
not required for removal and may damage plastic retainer.
(b) Pull
fitting from fuel system component
being serviced.
(c) The plastic retainer will remain on compo- nent being serviced after fitting is disconnected. The o-rings and spacer will remain in quick-con- nect fitting connector body.
FUEL DELIVERY - GAS
14 - 10
QUICK CONNECT FITTING (Continued)DR
Fig.8DISCONNECTINGSINGLE-TABTYPEFITTING 1 - PULL TAB 2 - SCREWDRIVER 3 - QUICK-CONNECT FITTING
Fig.10TYPICAL2–TABTYPEFITTING
1 - TAB(S) 2 - QUICK-CONNECT FITTING
Fig.9REMOVINGPULLTAB
1 - FUEL TUBE OR FUEL SYSTEM COMPONENT 2 - PULL TAB 3 - QUICK-CONNECT FITTING 4 - FUEL TUBE STOP
(8) Plastic Retainer Ring Type Fitting: This type of fitting can be identified by the use of a full- round plastic retainer ring (Fig. 11) usually black in color.
(a) To release fuel system component from quick- connect fitting, firmly push fitting towards compo- nent being serviced while firmly pushing plastic retainer ring into fitting (Fig. 11). With plastic ring depressed, pull fitting from component. The plas- tic retainer ring must be pressed squarely into fitting body. If this retainer is cocked during removal, it may be difficult to discon- nect fitting. Use an open-end wrench on shoulder of plastic retainer ring to aid in dis- connection.
Fig.11PLASTICRETAINERRINGTYPEFITTING
1 - FUEL TUBE 2 - QUICK CONNECT FITTING 3 - PUSH 4 - PLASTIC RETAINER 5 - PUSH 6 - PUSH 7 - PUSH 8 - PUSH
(b) After disconnection, plastic retainer ring will
remain with quick-connect fitting connector body.
(c) Inspect fitting connector body, plastic retainer for damage.
ring and fuel system component Replace as necessary. (9) Latch Clips: Depending on vehicle model and engine, 2 different types of safety latch clips are used
DR QUICK CONNECT FITTING (Continued)
FUEL DELIVERY - GAS
14 - 11
Fig.12LATCHCLIP-TYPE1
1 - TETHER STRAP 2 - FUEL LINE 3 - SCREWDRIVER 4 - LATCH CLIP 5 - FUEL RAIL
Fig.14FUELLINEDISCONNECTIONUSING
SPECIALTOOL
1 - SPECIAL FUEL LINE TOOL 2 - FUEL LINE 3 - FUEL RAIL
(c) Slide latch clip toward fuel rail while lifting
with screwdriver.
(d) Insert special fuel line removal tool (Snap-On number FIH 9055-1 or equivalent) into fuel line (Fig. 14). Use tool to release locking fingers in end of line.
(e) With special tool still inserted, pull fuel line
from fuel rail.
(f) After disconnection, locking fingers will remain
within quick-connect fitting at end of fuel line. (10) Disconnect quick-connect fitting from fuel sys-
tem component being serviced.
CONNECTING
(1) Inspect quick-connect fitting body and fuel sys-
tem component for damage. Replace as necessary.
(2) Prior to connecting quick-connect
fitting to component being serviced, check condition of fitting and component. Clean parts with a lint-free cloth. Lubricate with clean engine oil.
(3) Insert quick-connect fitting into fuel tube or fuel system component until built-on stop on fuel tube or component rests against back of fitting.
(4) Continue pushing until a click is felt. (5) Single-tab type fitting: Push new tab down
until it locks into place in quick-connect fitting.
(6) Verify a locked condition by firmly pulling on
fuel tube and fitting (15-30 lbs.).
(7) Latch Clip Equipped: Install latch clip (snaps into position). If latch clip will not fit, this indi- cates fuel line is not properly installed to fuel rail (or other fuel line). Recheck fuel line con- nection.
(8) Connect negative cable to battery. (9) Start engine and check for leaks.
Fig.13LATCHCLIP-TYPE2
1 - LATCH CLIP
(Fig. 12) or (Fig. 13). Type-1 is tethered to fuel line and type-2 is not. A special tool will be necessary to disconnect fuel line after latch clip is removed. The latch clip may be used on certain fuel line/fuel rail connection, or to join fuel lines together.
(a) Type 1: Pry up on latch clip with a screw-
driver (Fig. 12).
(b) Type 2: Separate and unlatch 2 small arms on end of clip (Fig. 13) and swing away from fuel line.
14 - 12
FUEL DELIVERY - GAS
DR
BEFORE SERVICING THE FUEL PUMP MODULE, THE FUEL SYSTEM PRESSURE MUST BE RELEASED.
(1) Drain and remove fuel tank. Refer to Fuel
Tank Removal/Installation.
(2) The plastic fuel pump module locknut (Fig. 15) is threaded onto fuel tank. Install Special Tool 6856
to locknut and remove locknut (Fig. 16). The fuel pump module will spring up slightly when locknut is removed.(3) Remove module from fuel tank.
FUEL PUMP DESCRIPTION
The electric fuel pump is located inside of the fuel pump module. A 12 volt, permanent magnet, electric motor powers the fuel pump. The electric fuel pump is not a separate, serviceable component.
OPERATION
Voltage to operate the electric pump is supplied
through the fuel pump relay.
Fuel is drawn in through a filter at the bottom of the module and pushed through the electric motor gearset to the pump outlet.
Check Valve Operation: The bottom section of the fuel pump module contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when pump is not operational. It is also used to keep the fuel supply line full of gasoline when pump is not operational. After the vehicle has cooled down, fuel pressure may drop to 0 psi (cold fluid contracts), but liquid gasoline will remain in fuel supply line injectors. Fuel between the check valve and fuel pressure that has dropped to 0 psi on a cooled down vehicle (engine off) is a normal condition. The electric fuel pump is not a separate, service-
able component.
FUEL PUMP MODULE DESCRIPTION
The fuel pump module assembly is located on the top of the fuel tank (Fig. 1). The complete assembly contains the following components: † A combination fuel filter/fuel pressure regulator † A separate fuel pick-up, or inlet filter † An electric fuel pump † A lockring to retain pump module to tank † A soft gasket between tank flange and module † A fuel gauge sending unit (fuel level sensor) † Fuel line connection The fuel gauge sending unit may be serviced sepa- rately. If the electrical fuel pump, primary inlet filter, fuel filter or fuel pressure regulator require service, the fuel pump module must be replaced.
OPERATION
Refer to Fuel Pump, Inlet Filter, Fuel Filter / Fuel
Pressure Regulator and Fuel Gauge Sending Unit.
REMOVAL
Fig.15FUELPUMPMODULE(TOP)
1 - FUEL FILTER / FUEL PRESSURE REGULATOR 2 - ALIGNMENT ARROW 3 - TOP OF PUMP MODULE 4 - LOCKNUT 5 - ALIGNMENT MARKS
Fig.16LOCKNUTREMOVAL/INSTALLATION-
TYPICAL
WARNING: THE FUEL SYSTEM IS UNDER A CON- STANT PRESSURE (EVEN WITH THE ENGINE OFF).
1 - SPECIAL TOOL 6856
2 - LOCKNUTDR FUEL PUMP MODULE (Continued) INSTALLATION
CAUTION: Whenever the fuel pump module is ser- viced, the rubber gasket must be replaced.
(1) Using a new gasket, position fuel pump module
into opening in fuel tank.
(2) Position locknut over top of fuel pump module.
Install locknut finger tight.
(3) Rotate module until embossed alignment arrow (Fig. 15) points to center alignment mark. This step must be performed to prevent float from contacting side of fuel tank. Also be sure fitting on fuel filter/ fuel pressure regulator is pointed to drivers side of vehicle.
(4) Install Special Tool 6856 (Fig. 16) to locknut. (5) Tighten locknut. Refer to Torque Specifications. (6) Install fuel tank. Refer to Fuel Tank Removal/
Installation.
FUEL RAIL DESCRIPTION
The fuel injector rail is used to mount the fuel
injectors to the engine.
OPERATION
High pressure from the fuel pump is routed to the fuel rail. The fuel rail then supplies the necessary fuel to each individual fuel injector.
A quick-connect fitting with a safety latch clip is
used to attach the fuel line to the fuel rail.
The fuel rail is not repairable.
CAUTION: The left and right sections of the fuel rail are connected with either a flexible connecting hose, or joints. Do not attempt to separate the rail halves at these connecting hose or joints. Due to the design of the connecting hose or joint, it does not use any clamps. Never attempt to install a clamping device of any kind to the hose or joint. When removing the fuel rail assembly for any rea- son, be careful not to bend or kink the connecting hose or joint.
REMOVAL
3.7L V-6
WARNING: THE FUEL SYSTEM IS UNDER CON- STANT PRESSURE EVEN WITH ENGINE OFF. BEFORE SERVICING FUEL RAIL, FUEL SYSTEM PRESSURE MUST BE RELEASED.
FUEL DELIVERY - GAS
14 - 13
CAUTION: The left and right fuel rails are replaced as an assembly. Do not attempt to separate rail halves at connector tubes (Fig. 18). Due to design of tubes, it does not use any clamps. Never attempt to install a clamping device of any kind to tubes. When removing fuel rail assembly for any reason, be careful not to bend or kink tubes.
(1) Remove fuel tank filler tube cap. (2) Perform Fuel System Pressure Release Proce-
dure.
body.
(3) Remove negative battery cable at battery. (4) Remove air duct at throttle body air box. (5) Remove air box at throttle body. (6) Remove air resonator mounting bracket at
front of throttle body (2 bolts).
(7) Disconnect fuel line latch clip and fuel line at fuel rail. A special tool will be necessary for fuel line disconnection. Refer to Quick-Connect Fittings.
(8) Remove necessary vacuum lines at
throttle
(9) Disconnect electrical connectors at all 6 fuel injectors. To remove connector refer to (Fig. 17). Push red colored slider away from injector (1). While push- ing slider, depress tab (2) and remove connector (3) from injector. The factory fuel injection wiring har- ness is numerically tagged (INJ 1, INJ 2, etc.) for injector position identification. If harness is not tagged, note wiring location before removal.
(10) Disconnect electrical connectors at all throttle
body sensors.
Removal/Installation.
(11) Remove 6 ignition coils. Refer to Ignition Coil
(12) Remove 4 fuel rail mounting bolts (Fig. 18). (13) Gently rock and pull left side of fuel rail until fuel injectors just start to clear machined holes in cylinder head. Gently rock and pull right side of rail until injectors just start to clear cylinder head holes. Repeat this procedure (left/right) until all injectors have cleared cylinder head holes.
(14) Remove fuel rail
(with injectors attached)
from engine.
(15) If fuel injectors are to be removed, refer to
Fuel Injector Removal/Installation.
4.7L V-8
WARNING: THE FUEL SYSTEM IS UNDER CON- STANT PRESSURE EVEN WITH ENGINE OFF. BEFORE SERVICING FUEL RAIL, FUEL SYSTEM PRESSURE MUST BE RELEASED.
FUEL DELIVERY - GAS
14 - 14
FUEL RAIL (Continued)DR
CAUTION: The left and right fuel rails are replaced as an assembly. Do not attempt to separate rail halves at connector tubes (Fig. 19). Due to design of tubes, it does not use any clamps. Never attempt to install a clamping device of any kind to tubes. When removing fuel rail assembly for any reason, be careful not to bend or kink tubes.
Fig.17REMOVE/INSTALLINJECTORCONNECTOR
(1) Remove fuel tank filler tube cap. (2) Perform Fuel System Pressure Release Proce-
dure.
body.
(3) Remove negative battery cable at battery. (4) Remove air duct at throttle body air box. (5) Remove air box at throttle body. (6) Remove air resonator mounting bracket at
front of throttle body (2 bolts).
(7) Disconnect fuel line latch clip and fuel line at fuel rail. A special tool will be necessary for fuel line disconnection. Refer to Quick-Connect Fittings.
(8) Remove necessary vacuum lines at
throttle
(9) Disconnect electrical connectors at all 8 fuel injectors. To remove connector refer to (Fig. 17). Push red colored slider away from injector (1). While push- ing slider, depress tab (2) and remove connector (3) from injector. The factory fuel injection wiring har- ness is numerically tagged (INJ 1, INJ 2, etc.) for injector position identification. If harness is not tagged, note wiring location before removal.
(10) Disconnect electrical connectors at all throttle
body sensors.
Removal/Installation.
(11) Remove 8 ignition coils. Refer to Ignition Coil
(12) Remove 4 fuel rail mounting bolts (Fig. 19). (13) Gently rock and pull left side of fuel rail until fuel injectors just start to clear machined holes in cylinder head. Gently rock and pull right side of rail until injectors just start to clear cylinder head holes. Repeat this procedure (left/right) until all injectors have cleared cylinder head holes.
(14) Remove fuel rail
(with injectors attached)
from engine.
(15) If fuel injectors are to be removed, refer to
Fuel Injector Removal/Installation.
Fig.18FUELRAILREMOVE/INSTALL-3.7LV-6
5.7L V-8
1 - MOUNTING BOLTS (4) 2 - QUICK-CONNECT FITTING 3 - FUEL RAIL 4 - INJ. #1
5 - INJ. #3
6 - INJ. #5
7 - INJ. #2
8 - INJ. #4
9 - INJ. #6
10 - CONNECTOR TUBEWARNING: THE FUEL SYSTEM IS UNDER CON- STANT PRESSURE EVEN WITH ENGINE OFF. BEFORE SERVICING FUEL RAIL, FUEL SYSTEM PRESSURE MUST BE RELEASED.
DR FUEL RAIL (Continued)
FUEL DELIVERY - GAS
14 - 15
cable routing tray. Note original cable positions while removing (Fig. 22).
(7) Remove spark plug cable tray from engine by releasing 4 retaining clips (Fig. 21). Remove tray and cables from engine as an assembly.
(8) Disconnect electrical connectors at all 8 igni- tion coils. Refer to Ignition Coil Removal/Installation. (9) Disconnect fuel line latch clip and fuel line at fuel rail. A special tool will be necessary for fuel line disconnection. Refer to Quick-Connect Fittings.
(10) Disconnect electrical connectors at all 8 fuel injectors. To remove connector refer to (Fig. 17). Push red colored slider away from injector (1). While push- ing slider, depress tab (2) and remove connector (3) from injector. The factory fuel injection wiring har- ness is numerically tagged (INJ 1, INJ 2, etc.) for injector position identification. If harness is not tagged, note wiring location before removal.
(11) Disconnect electrical connectors at all throttle
body sensors.
own clamps (Fig. 20).
(12) Remove 4 fuel rail mounting bolts and hold-
(13) Gently rock and pull left side of fuel rail until fuel injectors just start to clear machined holes in intake manifold. Gently rock and pull right side of rail until injectors just start to clear intake manifold head holes. Repeat this procedure (left/right) until all injectors have cleared machined holes.
(14) Remove fuel rail
(with injectors attached)
from engine.
(15) If fuel injectors are to be removed, refer to
Fuel Injector Removal/Installation.
5.9L V-8
WARNING: THE FUEL SYSTEM IS UNDER A CON- STANT PRESSURE (EVEN WITH ENGINE TURNED OFF). BEFORE SERVICING FUEL RAIL ASSEMBLY, FUEL SYSTEM PRESSURE MUST BE RELEASED.
To release fuel pressure, refer to Fuel System Pres-
sure Release Procedure found in this group.
CAUTION: The left and right fuel rails are replaced as an assembly. Do not attempt to separate the rail halves at the connecting hose (Fig. 24). Due to the design of this connecting hose, it does use any clamps. Never attempt to install a clamping device of any kind to the hose. When removing the fuel rail assembly for any reason, be careful not to bend or kink the connecting hose.
(1) Remove negative battery cable at battery. (2) Remove air cleaner. (3) Perform fuel pressure release procedure. (4) Remove throttle body from intake manifold.
Refer to Throttle Body Removal/Installation.
Fig.19FUELRAILREMOVE/INSTALL-4.7LV-8
1 - MOUNTING BOLTS (4) 2 - INJ.#7
3 - INJ.#5
4 - QUICK-CONNECT FITTING 5 - INJ.#3
6 - FUEL INJECTOR RAIL 7 - INJ.#1
8 - CONNECTOR TUBE 9 - INJ.#2
10 - INJ.#4
11 - INJ.#6
12 - INJ.#8
13 - PRESSURE TEST PORT CAPCAUTION: The left and right fuel rails are replaced as an assembly. Do not attempt to separate rail halves at connector tube (Fig. 20). Due to design of tube, it does not use any clamps. Never attempt to install a clamping device of any kind to tube. When removing fuel rail assembly for any reason, be care- ful not to bend or kink tube.
(1) Remove fuel tank filler tube cap. (2) Perform Fuel System Pressure Release Proce-
dure.
engine).
(3) Remove negative battery cable at battery. (4) Remove flex tube (air
cleaner housing to
(5) Remove air resonator box at throttle body. (6) Disconnect all spark plug cables from all spark plugs and ignition coils. Do not remove cables from
FUEL DELIVERY - GAS
14 - 16
FUEL RAIL (Continued)DR
(6) Disconnect electrical connectors at all
fuel injectors. To remove connector refer to (Fig. 17). Push red colored slider away from injector (1). While push- ing slider, depress tab (2) and remove connector (3) from injector. The factory fuel injection wiring har- ness is numerically tagged (INJ 1, INJ 2, etc.) for injector position identification. If harness is not tagged, note wiring location before removal.
(7) Disconnect fuel tube (line) at side of fuel rail.
Refer to Quick-Connect Fittings for procedures,
(8) Remove the remaining fuel rail mounting bolts. (9) Gently rock and pull the left fuel rail until the fuel injectors just start to clear the intake manifold. Gently rock and pull the right fuel rail until the fuel injectors just start to clear the intake manifold. Repeat this procedure (left/right) until all fuel injec- tors have cleared the intake manifold.
(10) Remove fuel rail
(with injectors attached)
from engine.
Fig.205.7LFUELRAIL
1 - FUEL RAIL 2 - MOUNTING BOLT 3 - HOLDOWN CLAMPS 4 - CONNECTOR TUBE
8.0L V-10
WARNING: THE FUEL SYSTEM IS UNDER A CON- STANT PRESSURE EVEN WITH THE ENGINE OFF. BEFORE SERVICING FUEL RAIL, FUEL SYSTEM PRESSURE MUST BE RELEASED.
(1) Remove negative battery cable at battery. (2) Remove air cleaner housing and tube. (3) Perform fuel pressure release procedure. Refer
to Fuel Delivery System section of this group.
(4) Disconnect throttle body linkage and remove throttle body from intake manifold. Refer to Throttle Body removal in this group.
(5) Remove ignition coil pack and bracket assem- bly (Fig. 25) at intake manifold and right engine valve cover (four bolts).
(6) Remove upper half of intake manifold. Refer to
Engines for procedures.
(7) Disconnect electrical connectors at all
fuel injectors. To remove connector refer to (Fig. 26). Push red colored slider away from injector (1). While push- ing slider, depress tab (2) and remove connector (3) from injector. The factory fuel injection wiring har- ness is numerically tagged (INJ 1, INJ 2, etc.) for injector position identification.
(8) Disconnect fuel
line quick-connect fitting at left-rear end of fuel rail. A special 3/8 inch fuel line disconnection tool will be necessary.
(9) Remove the six fuel rail mounting bolts from
the lower half of intake manifold (Fig. 27).
(10) Gently rock and pull the left fuel rail until the fuel injectors just start to clear the intake mani- fold. Gently rock and pull the right fuel rail until the fuel injectors just start to clear the intake mani- fold. Repeat this procedure (left/right) until all fuel injectors have cleared the intake manifold.
Fig.215.7LSPARKPLUGCABLEROUTINGTRAY 1 - SPARK PLUG CABLES 2 - RETAINING CLIP 3 - SPARK PLUG CABLE ROUTING TRAY
(5) If equipped with air conditioning, remove the A-shaped A/C compressor-to-intake manifold support bracket (three bolts) (Fig. 23).
DR FUEL RAIL (Continued)
FUEL DELIVERY - GAS
14 - 17
Fig.225.7LSPARKPLUGCABLEROUTING
1 - #8 COIL-TO- #5 SPARK PLUG (MARKED 5/8) 2 - #5 COIL-TO- #8 SPARK PLUG (MARKED 5/8) 3 - #7 COIL-TO- #4 SPARK PLUG (MARKED 4/7) 4 - #3 COIL-TO- #2 SPARK PLUG (MARKED 2/3) 5 - #1 COIL-TO- #6 SPARK PLUG (MARKED 1/6) 6 - CLIPS (TRAY-TO-MANIFOLD RETENTION)
7 - CABLE TRAY 8 - CLIPS (SPARK PLUG CABLE-TO-TRAY- RETENTION) 9 - #2 COIL-TO- #3 SPARK PLUG (MARKED 2/3) 10 - #6 COIL-TO- #1 SPARK PLUG (MARKED 1/6) 11 - #4 COIL-TO- #7 SPARK PLUG (MARKED 4/7)
Fig.23A/CCOMPRESSORSUPPORTBRACKET-
5.9LV-8
1 - AIR CONDITIONING COMPRESSOR SUPPORT BRACKET 2 - MOUNTING BOLTS
(11) Remove fuel rail
(with injectors attached)
from engine.
(12) If fuel injectors are to be removed, refer to
Fuel Injector Removal/Installation.
Fig.24FUELRAILREMOVE/INSTALL-5.9LV-8
1 - FUEL RAIL CONNECTING HOSE 2 - FUEL RAIL 3 - MOUNTING BOLTS (4)
FUEL DELIVERY - GAS
14 - 18
FUEL RAIL (Continued)DR
Fig.25IGNITIONCOILPACKANDMOUNTING
BRACKET-8.0LV-10
1 - COIL PACKS AND BRACKET 2 - MOUNTING BOLTS (4)
Fig.27FUELRAILMOUNTINGBOLTS-8.0LV-10-
TYPICAL
1 - FUEL RAIL 2 - ELECTRICAL CONNECTOR 3 - MOUNTING BOLTS (6) 4 - INTAKE MANIFOLD LOWER HALF 5 - FUEL PRESSURE TEST PORT 6 - FUEL INJECTORS (10)
INSTALLATION
3.7L V-6
(1) If fuel injectors are to be installed, refer to Fuel
Injector Removal/Installation.
fuel
injector machined bores in
(2) Clean out intake manifold.
(3) Apply a small amount of engine oil to each fuel injector o-ring. This will help in fuel rail installation. injector assembly to
(4) Position fuel
rail/fuel
machined injector openings in cylinder head.
(5) Guide each injector into cylinder head. Be care-
ful not to tear injector o-rings.
(6) Push right side of fuel rail down until fuel injectors have bottomed on cylinder head shoulder. Push left fuel rail down until injectors have bot- tomed on cylinder head shoulder.
(7) Install 4 fuel rail mounting bolts and tighten.
Refer to torque specifications.
(8) Install 6 ignition coils. Refer to Ignition Coil
Removal/Installation.
(9) Connect electrical connectors to throttle body. (10) Connect electrical connectors at all fuel injec- tors. To install connector, refer to (Fig. 17). Push con- nector onto injector (1) and then push and lock red colored slider (2). Verify connector is locked to injec- tor by lightly tugging on connector.
Fig.26REMOVE/INSTALLFUELINJECTOR
CONNECTOR
DR FUEL RAIL (Continued)
FUEL DELIVERY - GAS
14 - 19
(11) Connect necessary vacuum lines to throttle
(5) Guide each injector into intake manifold. Be
body.
(12) Install air resonator mounting bracket near
front of throttle body (2 bolts).
(13) Connect fuel line latch clip and fuel line to
fuel rail. Refer to Quick-Connect Fittings.
(14) Install air box to throttle body. (15) Install air duct to air box. (16) Connect battery cable to battery. (17) Start engine and check for leaks.
4.7L V-8
(1) If fuel injectors are to be installed, refer to Fuel
Injector Removal/Installation.
fuel
injector machined bores in
(2) Clean out intake manifold.
(3) Apply a small amount of engine oil to each fuel injector o-ring. This will help in fuel rail installation. injector assembly to
(4) Position fuel
rail/fuel
machined injector openings in cylinder head.
(5) Guide each injector into cylinder head. Be care-
ful not to tear injector o-rings.
(6) Push right side of fuel rail down until fuel injectors have bottomed on cylinder head shoulder. Push left fuel rail down until injectors have bot- tomed on cylinder head shoulder.
(7) Install 4 fuel rail mounting bolts and tighten.
careful not to tear injector o-rings.
(6) Push right side of fuel rail down until fuel injectors have bottomed on shoulders. Push left fuel rail down until injectors have bottomed on shoulders. (7) Install 4 fuel rail holdown clamps and 4 mount-
ing bolts. Refer to Torque Specifications.
(8) Position spark plug cable tray and cable assem- bly to intake manifold. Snap 4 cable tray retaining clips into intake manifold.
(9) Install all cables to spark plugs and ignition
coils.
(10) Connect electrical connector to throttle body. (11) Install electrical connectors to all 8 ignition
coils. Refer to Ignition Coil Removal/Installation.
(12) Connect electrical connector to throttle body. (13) Connect electrical connectors at all fuel injec- tors. To install connector, refer to (Fig. 17). Push con- nector onto injector (1) and then push and lock red colored slider (2). Verify connector is locked to injec- tor by lightly tugging on connector.
(14) Connect fuel line latch clip and fuel line to
fuel rail. Refer to Quick-Connect Fittings.
(15) Install air resonator to throttle body (2 bolts). (16) Install flexible air duct to air box. (17) Connect battery cable to battery. (18) Start engine and check for leaks.
Refer to torque specifications.
(8) Install 8 ignition coils. Refer to Ignition Coil
5.9L V-8
Removal/Installation.
(9) Connect electrical connectors to throttle body. (10) Connect electrical connectors at all fuel injec- tors. To install connector, refer to (Fig. 17). Push con- nector onto injector (1) and then push and lock red colored slider (2). Verify connector is locked to injec- tor by lightly tugging on connector.
(11) Connect necessary vacuum lines to throttle
body.
(1) If fuel injectors are to be installed, refer to Fuel
Injector Removal/Installation.
(2) Apply a small amount of engine oil to each fuel injector o-ring. This will help in fuel rail installation. injector machined bores in
fuel
(3) Clean out intake manifold.
(4) Position fuel rail/fuel injector assembly to injec-
tor openings on intake manifold.
(5) Guide each injector into intake manifold. Be
(12) Install air resonator mounting bracket near
careful not to tear injector o-ring.
front of throttle body (2 bolts).
(13) Connect fuel line latch clip and fuel line to
fuel rail. Refer to Quick-Connect Fittings.
(14) Install air box to throttle body. (15) Install air duct to air box. (16) Connect battery cable to battery. (17) Start engine and check for leaks.
5.7L V-8
(1) If fuel injectors are to be installed, refer to Fuel
Injector Removal/Installation.
fuel
injector machined bores in
(2) Clean out intake manifold.
(3) Apply a small amount of engine oil to each fuel injector o-ring. This will help in fuel rail installation. injector assembly to
(4) Position fuel
rail/fuel
machined injector openings in intake manifold.
(6) Push the right fuel rail down until fuel injec- tors have bottomed on injector shoulder. Push the left fuel rail down until fuel injectors have bottomed on injector shoulder.
(7) Install fuel rail mounting bolts. Refer to Torque
Specifications.
(8) Connect electrical connector to intake manifold
air temperature sensor.
(9) Connect electrical connectors at all fuel injec- tors. To install connector, refer to (Fig. 17). Push con- nector onto injector (1) and then push and lock red colored slider (2). Verify connector is locked to injec- tor by lightly tugging on connector.
(10) Install fuel tube (line) at side of fuel rail.
Refer to Quick-Connect Fittings for procedures.
(11) Install air cleaner resonator to throttle body. (12) Connect battery cable to battery.
FUEL DELIVERY - GAS
14 - 20
FUEL RAIL (Continued)(13) Start engine and check for leaks.
8.0L V-10
(1) Apply a small amount of engine oil to each fuel injector o-ring. This will help in fuel rail installation. injector(s) and injector clip(s) to fuel
(2) Install
rail.
NOTE: The fuel injector electrical connectors on all 10 injectors should be facing to right (passenger) side of vehicle (Fig. 27).
(3) Position fuel rail/fuel injector assembly to injec-
tor openings on intake manifold.
(4) Guide each injector into intake manifold. Be
careful not to tear injector o-ring.
(5) Push the right fuel rail down until fuel injec- tors have bottomed on injector shoulder. Push the left fuel rail down until fuel injectors have bottomed on injector shoulder.
(6) Install six fuel rail mounting bolts into lower half of intake manifold. Tighten bolts to 15 N·m (136
in. lbs.) torque.(7) Connect electrical connectors at all fuel injec- tors. To install connector, refer to (Fig. 26). Push con- nector onto injector (1) and then push and lock red colored slider (2). Verify connector is locked to injec- tor by lightly tugging on connector. The injector wir- ing harness is numerically tagged.
(8) Install upper half of intake manifold. Refer to
Engines for procedures.
Quick-Connect Fittings for procedures.
(10) Install ignition coil pack and bracket assem- bly at intake manifold and right engine valve cover (four bolts).
(11) Install throttle body to intake manifold. Refer
to Throttle Body Removal / Installation.
(12) Install throttle body linkage to throttle body. (13) Install air cleaner tube and housing. (14) Install negative battery cable at battery. (15) Start engine and check for leaks.
FUEL TANK DESCRIPTION
The fuel tank is constructed of a plastic material. Its main functions are for fuel storage and for place- ment of the fuel pump module, and (if equipped) cer- tain ORVR components.
OPERATION
All models pass a full 360 degree rollover test without fuel leakage. To accomplish this, fuel and vapor flow controls are required for all fuel tank con- nections.
DR
Two check (control) valves are mounted into the top of the fuel tank. Refer to Fuel Tank Check Valve for additional information.
An evaporation control system is connected to the fuel tank to reduce emissions of fuel vapors into the atmosphere. When fuel evaporates from the fuel tank, vapors pass through vent hoses or tubes to a charcoal canister where they are temporarily held. When the engine is running, the vapors are drawn into the intake manifold. Certain models are also equipped with a self-diagnosing system using a Leak Detection Pump (LDP) and/or an On-Board Refueling Vapor Recovery (ORVR) system. Refer to Emission Control System for additional information.
REMOVAL- EXCEPT DIESEL
Fuel Tank Draining
WARNING: THE FUEL SYSTEM MAY BE UNDER CONSTANT FUEL PRESSURE EVEN WITH THE ENGINE OFF. PRESSURE MUST BE RELEASED BEFORE SERVICING FUEL TANK.
THIS
Two different procedures may be used to drain fuel tank: through the fuel fill fitting on tank, or using the DRBt scan tool. Due to a one-way check valve installed into the fuel fill opening fitting at the tank, the tank cannot be drained conventionally at the fill cap.
The quickest draining procedure involves removing
As an alternative procedure, the electric fuel pump may be activated allowing tank to be drained at fuel rail connection. Refer to DRB scan tool for fuel pump activation procedures. Before disconnecting fuel line at fuel rail, release fuel pressure. Refer to the Fuel System Pressure Release Procedure for procedures. Attach end of special test hose tool number 6541, 6539, 6631 or 6923 at fuel rail disconnection (tool number will depend on model and/or engine applica- tion). Position opposite end of this hose tool to an approved gasoline draining station. Activate fuel pump and drain tank until empty.
If electric fuel pump is not operating, fuel must be drained through fuel fill fitting at tank. Refer to fol- lowing procedures.
(1) Release fuel system pressure. (2) Raise vehicle. (3) Thoroughly clean area around fuel fill fitting
and rubber fuel fill hose at tank.
(4) If vehicle is equipped with 4 doors and a 6 foot
(short) box, remove left-rear tire/wheel.
(5) Loosen clamp (Fig. 28) and disconnect rubber fuel fill hose at tank fitting. Using an approved gas holding tank, drain fuel tank through this fitting.
(9) Connect main fuel line at fuel rail. Refer to
the rubber fuel fill hose.
DR FUEL TANK (Continued) Tank Removal
(1) Loosen clamp and disconnect rubber fuel vent
hose (Fig. 28) at tank fitting.
(2) Support tank with a hydraulic jack. (3) Remove 2 fuel tank strap nuts (Fig. 29) and
remove both tank support straps.
(4) Carefully lower tank a few inches and discon- nect fuel pump module electrical connector (Fig. 30) at top of tank. To disconnect electrical connector: Push upward on red colored tab to unlock. Push on black colored tab while removing connector.
FUEL DELIVERY - GAS
14 - 21
(5) Disconnect fuel line at fuel filter / fuel pressure regulator (Fig. 30) by pressing on tabs at side of quick-connect fitting.
(6) Disconnect EVAP line at top of tank (Fig. 1). (7) Continue to lower tank for removal. (8) If fuel tank is to be replaced, remove fuel pump module from tank. Refer to Fuel Pump Module Removal/Installation procedures.
1 - BEZEL SCREWS 2 - FUEL FILL BEZEL 3 - HOSE CLAMPS
Fig.28FUELTANKFILL/VENTHOSES
4 - VENT HOSE 5 - FUEL TANK 6 - FILL HOSE
FUEL DELIVERY - GAS
14 - 22
FUEL TANK (Continued)DR
Fig.29FUELTANKMOUNTING
4 - MOUNTING STRAPS 5 - STRAP NUTS
1 - FUEL TANK 2 - STRAP MOUNTING STUDS 3 - VEHICLE FRAME
INSTALLATION - EXCEPT DIESEL
(1) If fuel tank is to be replaced, install fuel pump module into tank. Refer to Fuel Pump Module Removal/Installation procedures.
(2) Disconnect clamps and remove rubber fuel fill hose and fuel vent hose at fuel fill tube. Install these 2 hoses to 2 fuel tank fittings. Rotate hoses until paint marks on hoses line up with alignment marks (Fig. 31). Tighten both clamps.
(3) Position fuel tank to hydraulic jack. (4) Raise tank until positioned near body. (5) Connect EVAP line at tank (Fig. 1). (6) Connect fuel pump module electrical connector
(Fig. 30) at top of tank.
(7) Connect fuel line quick-connect fitting to fuel
filter / fuel pressure regulator (Fig. 1) or (Fig. 30).
(8) Continue raising tank until positioned snug to
body.
(9) Install and position both tank support straps. Install 2 fuel tank strap nuts (Fig. 29) and tighten. Tighten rear strap nut first. Refer to Torque Spec- ifications.
(10) Connect rubber fill and vent hoses to fuel fill
tube and tighten clamps.
(11) Lower vehicle. (12) Fill fuel tank with fuel.
DR FUEL TANK (Continued)
FUEL DELIVERY - GAS
14 - 23
INLET FILTER REMOVAL
The fuel pump inlet filter (strainer) is located on the bottom of the fuel pump module (Fig. 32). The fuel pump module is located inside of fuel tank.
Fig.30FUELPUMPMODULECONNECTIONS
1 - TOP OF FUEL TANK 2 - FUEL PUMP MODULE 3 - FUEL FILTER / FUEL PRESSURE REGULATOR 4 - ELEC. CONNECT.
Fig.32FUELPUMPINLETFILTER
(13) Start engine and check for fuel leaks near top
of module.
1 - FUEL PUMP INLET FILTER 2 - LOCK TABS (2) 3 - FUEL PUMP MODULE (BOTTOM)
(1) Remove fuel tank. Refer to Fuel Tank Removal/
Installation.
(2) Remove fuel pump module. Refer to Fuel Pump
Module Removal/Installation.
(3) Remove filter by carefully prying 2 lock tabs at bottom of module with 2 screwdrivers. Filter is snapped to module.
(4) Clean bottom of pump module.
INSTALLATION
The fuel pump inlet filter (strainer) is located on the bottom of the fuel pump module (Fig. 32). The fuel pump module is located inside of fuel tank.
(1) Snap new filter to bottom of module. Be sure
o-ring is in correct position.
(2) Install fuel pump module. Refer to Fuel Pump
Module Removal/Installation.
(3) Install fuel tank. Refer to Fuel Tank Removal/
Installation.
Fig.31HOSEALIGNMENTMARKS
1 - ALIGNMENT MARKS (MARK FOR FILL HOSE IS LOCATED ON FUEL TANK - MARK FOR VENT HOSE IS LOCATED ON FITTING) 2 - PAINT MARKS ON RUBBER HOSES
14 - 24
FUEL INJECTION - GAS
FUEL INJECTION - GAS
TABLE OF CONTENTS
page
DR
page
ACCELERATOR PEDAL
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 24ACCELERATOR PEDAL POSITION SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 25
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 25CRANKSHAFT POSITION SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 26
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 30FUEL INJECTOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 32
OPERATIONOPERATION - FUEL INJECTOR OPERATION - PCM OUTPUT
. . . . . . . . . . 32
. . . . . . . . . . . . 32
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 33FUEL PUMP RELAY
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 33
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 33IDLE AIR CONTROL MOTOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 33
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34ACCELERATOR PEDAL REMOVAL
The following procedure applies only to vehicles
without the Adjustable Pedal Package (code XAP).
The accelerator pedal
is serviced as a complete
assembly including the bracket.
The accelerator cable is connected to the upper the accelerator pedal arm by a plastic part of retainer (clip) (Fig. 1). This plastic retainer snaps into the top of the accelerator pedal arm.
(1) From inside the vehicle, hold up accelerator pedal. Remove plastic cable retainer (clip) and throt- tle cable core wire from upper end of accelerator pedal arm (Fig. 1). Plastic cable retainer (clip) snaps into pedal arm.
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 35
INTAKE AIR TEMPERATURE SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 36
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 38MAP SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 39
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 42OXYGEN SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 43
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 45THROTTLE BODY
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 45
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 47THROTTLE CONTROL CABLE
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 51THROTTLE POSITION SENSOR
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 52
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 54(2) Remove 2 accelerator pedal mounting bracket
nuts. Remove accelerator pedal assembly.
INSTALLATION
(1) Place accelerator pedal assembly over 2 studs. (2) Install and tighten 2 mounting nuts. Refer to
Torque Specifications.
(3) Slide throttle cable into opening slot in top of
pedal arm.
(4) Push plastic cable retainer (clip) into accelera-
tor pedal arm opening until it snaps into place.
(5) Before starting engine, operate accelerator
pedal to check for any binding.
DR ACCELERATOR PEDAL (Continued)
FUEL INJECTION - GAS
14 - 25
REMOVAL
The APPS is serviced (replaced) as one assembly including the sensor, plastic housing and cable. The APPS assembly is located under the vehicle battery tray (Fig. 2). Access to APPS is gained from over top of left / front tire.
(1) Disconnect negative battery cable at battery. (2) Disconnect APPS cable at accelerator pedal.
Refer to Accelerator Pedal Removal / Installation.
(3) Remove wheel house liner at left / front wheel.
Refer to Body.
(4) Gain access to APPS electrical connector by opening swing-down door (Fig. 3). Disconnect electri- cal connector.
(5) Remove 3 mounting bolts (Fig. 3). (6) Remove APPS assembly from battery tray. (7) If cable is to be separated at APPS, unsnap cable clip from ball socket (Fig. 4). Release cable from plastic housing by pressing on small cable release tab (Fig. 3).
Fig.1ACCELERATORPEDALMOUNTING
1 - ACCELERATOR CABLE 2 - PLASTIC RETAINER (CLIP) 3 - THROTTLE PEDAL ARM 4 - PEDAL / BRACKET ASSEMBLY 5 - CABLE CLIP
ACCELERATOR PEDAL POSITION SENSOR DESCRIPTION
The Accelerator Pedal Position Sensor (APPS) assembly is located under the vehicle battery tray. A cable connects the assembly to the accelerator pedal. A plastic cover with a movable door is used to cover the assembly.
The APPS is used only with the 5.7L V-8 engine.
OPERATION
The Accelerator Pedal Position Sensor (APPS) is a linear potentiometer. It provides the Powertrain Con- trol Module (PCM) with a DC voltage signal propor- tional to the angle, or position of the accelerator pedal. The APPS signal is translated (along with other sensors) to place the throttle plate (within the throttle body) to a pre-determined position.
A mechanical cable is used between the accelerator pedal and the APPS assembly. Although a cable is used between the pedal and APPS, a mechanical cable is not used at the throttle body. Throttle plate position is electrically determined.
Fig.2APPSLOCATION
1 - BATTERY TRAY 2 - APPS LOCATION 3 - APPS MOUNTING BOLTS
INSTALLATION
(1) Install Accelerator Pedal Position Sensor (APPS) cable to accelerator pedal. Refer to Accelera- tor Pedal Removal / Installation.
(2) Connect electrical connector to APPS. (3) If necessary, connect cable to APPS lever ball
socket (snaps on).
(4) Snap APPS cable cover closed.
FUEL INJECTION - GAS
14 - 26
ACCELERATOR PEDAL POSITION SENSOR (Continued)DR
(5) Position APPS assembly to bottom of battery tray and install 3 bolts. Refer to Torque Specifica- tions.
(6) Install wheelhouse liner. Refer to Body. (7) Perform the following procedure:
(a) Connect negative battery cable to battery. (b) Turn ignition switch ON, but do not crank
engine.
(c) Leave ignition switch ON for a minimum of 10 seconds. This will allow PCM to learn electrical parameters. (8) If the previous step is not performed, a Diag-
nostic Trouble Code (DTC) will be set.
(9) If necessary, use DRB IIIt Scan Tool to erase
any Diagnostic Trouble Codes (DTC’s) from PCM.
Fig.3APPSREMOVE/INSTALL
1 - BOTTOM OF BATTERY TRAY 2 - ELECTRICAL CONNECTOR 3 - APPS 4 - SWING-DOWN DOOR 5 - CABLE (TO PEDAL) 6 - CABLE RELEASE TAB
Fig.4APPSCABLE
1 - APPS LEVER 2 - BALL SOCKET 3 - SWING-DOWN DOOR 4 - CABLE CLIP 5 - CABLE
CRANKSHAFT POSITION SENSOR DESCRIPTION
3.7L V-6
The Crankshaft Position (CKP) sensor is mounted into the right rear side of the cylinder block. It is positioned and bolted into a machined hole.
4.7L V-8
The Crankshaft Position (CKP) sensor is mounted into the right rear side of the cylinder block. It is positioned and bolted into a machined hole.
5.7L V-8
The Crankshaft Position (CKP) sensor is mounted into the right rear side of the cylinder block. It is positioned and bolted into a machined hole.
5.9L V-8 Gas
The Crankshaft Position (CKP) sensor is located near the outer edge of the flywheel (starter ringear). It is bolted to the rear of the engine.
8.0L V-10
The Crankshaft Position (CKP) sensor is located on the right-lower side of the cylinder block, forward of the right engine mount, just above the oil pan rail.
OPERATION
3.7L V-6
Engine speed and crankshaft position are provided through the CKP (Crankshaft Position) sensor. The sensor generates pulses that are the input sent to the Powertrain Control Module (PCM). The PCM inter- prets the sensor input to determine the crankshaft position. The PCM then uses this position, along with
DR CRANKSHAFT POSITION SENSOR (Continued)
FUEL INJECTION - GAS
14 - 27
other inputs, to determine injector sequence and igni- tion timing.
The sensor is a hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.
A tonewheel (targetwheel) is bolted to the engine (Fig. 5). This tonewheel has sets of
crankshaft notches at its outer edge (Fig. 5).
The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input to the PCM.
Fig.6CKPSENSOROPERATIONANDTONEWHEEL
-4.7LV-8
1 - TONEWHEEL 2 - NOTCHES 3 - CRANKSHAFT POSITION SENSOR 4 - CRANKSHAFT
5.7L V-8
Engine speed and crankshaft position are provided through the crankshaft position sensor. The sensor generates pulses that are the input sent to the pow- ertrain control module (PCM). The PCM interprets the sensor input to determine the crankshaft posi- tion. The PCM then uses this position, along with other inputs, to determine injector sequence and igni- tion timing.
The sensor is a hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.
On the 5.7L V–8 engine, a tonewheel is bolted to the engine crankshaft. This tonewheel has sets of notches at its outer edge (Fig. 7).
The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input to the PCM.
5.9L V-8 Gas
Engine speed and crankshaft position are provided through the CKP sensor. The sensor generates pulses that are the input sent to the Powertrain Control Module (PCM). The PCM interprets the sensor input to determine the crankshaft position. The PCM then uses this position, along with other inputs, to deter- mine injector sequence and ignition timing.
Fig.5CKPOPERATION-3.7LV-6
1 - TONEWHEEL 2 - NOTCHES 3 - CRANKSHAFT POSITION SENSOR 4 - CRANKSHAFT
4.7L V-8
Engine speed and crankshaft position are provided through the crankshaft position sensor. The sensor generates pulses that are the input sent to the pow- ertrain control module (PCM). The PCM interprets the sensor input to determine the crankshaft posi- tion. The PCM then uses this position, along with other inputs, to determine injector sequence and igni- tion timing.
The sensor is a hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.
On the 4.7L V–8 engine, a tonewheel is bolted to the engine crankshaft (Fig. 6). This tonewheel has sets of notches at its outer edge (Fig. 6).
The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input to the PCM.
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CRANKSHAFT POSITION SENSOR (Continued)DR
Fig.7CKPSENSOROPERATIONANDNOTCHES-
5.7LV-8
1 - RIGHT / REAR SIDE OF CYLINDER BLOCK 2 - MACHINED HOLE 3 - NOTCHES
Fig.8CKPSENSOROPERATION–5.9LV-8
1 - CRANKSHAFT POSITION SENSOR 2 - NOTCHES 3 - FLYWHEEL
The sensor is a hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.
On 5.9L V-8 engines, the flywheel/drive plate has 8
single notches, spaced every 45 degrees, at its outer edge (Fig. 8).The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input to the PCM. For each engine revolution, there are 8
pulses generated on V-8 engines.The engine will not operate if the PCM does not
receive a CKP sensor input.
8.0L V-10
The Crankshaft Position (CKP) sensor detects notches machined into the middle of the crankshaft (Fig. 9).
There are five sets of notches. Each set contains two notches. Basic ignition timing is determined by the position of the last notch in each set of notches. Once the Powertrain Control Module (PCM) senses the last notch, it will determine crankshaft position (which piston will next be at Top Dead Center). An input from the camshaft position sensor is also needed. It may take the module up to one complete engine revolution to determine crankshaft position during engine cranking.
Fig.9CKPSENSOROPERATION–8.0LV-10
ENGINE
1 - CRANKSHAFT NOTCHES 2 - CRANKSHAFT 3 - CRANKSHAFT POSITION SENSOR
The PCM uses the signal from the camshaft posi- tion sensor to determine fuel injector sequence. Once crankshaft position has been determined, the PCM begins energizing a ground circuit to each fuel injec- tor to provide injector operation.
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DR CRANKSHAFT POSITION SENSOR (Continued) REMOVAL
3.7L V-6
The Crankshaft Position (CKP) sensor is mounted into the right rear side of the cylinder block (Fig. 10). It is positioned and bolted into a machined hole.
(1) Raise vehicle. (2) Disconnect sensor electrical connector. (3) Remove sensor mounting bolt (Fig. 10). (4) Carefully twist sensor from cylinder block. (5) Check condition of sensor o-ring.
Fig.11CKPREMOVAL/INSTALLATION-4.7L
1 - CRANKSHAFT POSITION SENSOR 2 - MOUNTING BOLT
(2) Disconnect CKP electrical connector at sensor. (3) Remove CKP mounting bolt (Fig. 11). (4) Carefully twist sensor from cylinder block. (5) Remove sensor from vehicle. (6) Check condition of sensor o-ring.
5.7L V-8
Fig.10CKPREMOVAL/INSTALLATION-3.7L
1 - MOUNTING BOLT 2 - CKP SENSOR 3 - O-RING
4.7L V-8
The Crankshaft Position (CKP) sensor is located at the right-rear side of the engine cylinder block (Fig. 11). It is positioned and bolted into a machined hole in the engine block. (1) Raise vehicle.
