Lamps JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual

NOTE: When servicing the exhaust system, replace
the factory installed uni-clamp with standard u-bolt
clamps.
(2) Position the catalytic converter onto the
exhaust pipe flange connection. Tighten retaining
nuts to 28 N´m (250 in. lbs.). (Fig. 16)
(3) Coat the oxygen sensor with anti-seize com-
pound. Install the sensor and tighten the nut to 48
N´m (35 ft. lbs.) torque (Fig. 13).
(4) Lower the vehicle.
(5) Start the engine and inspect for exhaust leaks
and exhaust system contact with the body panels.
Adjust the alignment, if needed.
(6) After initial start-up, check the engine exhaust
manifold to exhaust pipe nuts for proper torque.
Fig. 14 Catalytic ConverterÐRemoval
1 - EXHAUST PIPE WITH FLANGE
2 - NUTS (3)
3 - CATALYTIC CONVERTER
Fig. 15 Exhaust Pipe 4.7L
1 - EXHAUST PIPE HANGER
A - NUTS (4)
3 - EXHAUST PIPE
B - BOLTS (4)
Fig. 16 Installing Exhaust Clamps
1 - CATALYTIC CONVERTER
2 - MUFFLER
WJEXHAUST SYSTEM 11 - 11
EXHAUST PIPE - 4.7L (Continued)

TAILPIPE
DESCRIPTION
The tailpipe is also made of stainless steel. (Fig.
18) .
OPERATION
The Tailpipe channels the exhaust out of the muf-
fler and out from under the vehicle to control noise
and prevent exhaust gas fumes from entering the
passenger compartment
Fig. 19 Installing Exhaust Clamps
1 - CATALYTIC CONVERTER
2 - MUFFLER
Fig. 20 Muffler and Tailpipe
1 - CATALYTIC CONVERTER
2 - TAILPIPE HANGER
3 - TAILPIPE
4 - MUFFLER
WJEXHAUST SYSTEM 11 - 13
MUFFLER (Continued)

STANDARD PROCEDURE - FUEL SYSTEM
PRESSURE RELEASE
Use following procedure if the fuel injector
rail is, or is not equipped with a fuel pressure
test port.
(1) Remove fuel fill cap.
(2) Remove fuel pump relay from Power Distribu-
tion Center (PDC). For location of relay, refer to label
on underside of PDC cover.
(3) Start and run engine until it stalls.
(4) Attempt restarting engine until it will no
longer run.
(5) Turn ignition key to OFF position.
CAUTION: Steps 1, 2, 3 and 4 must be performed to
relieve high pressure fuel from within fuel rail. Do
not attempt to use following steps to relieve this
pressure as excessive fuel will be forced into a cyl-
inder chamber.
(6) Unplug connector from any fuel injector.
(7) Attach one end of a jumper wire with alligator
clips (18 gauge or smaller) to either injector terminal.(8) Connect other end of jumper wire to positive
side of battery.
(9) Connect one end of a second jumper wire to
remaining injector terminal.
CAUTION: Powering an injector for more than a few
seconds will permanently damage the injector.
(10) Momentarily touch other end of jumper wire
to negative terminal of battery for no more than a
few seconds.
(11) Place a rag or towel below fuel line quick-con-
nect fitting at fuel rail.
(12) Disconnect quick-connect fitting at fuel rail.
Refer to Quick-Connect Fittings.
(13) Return fuel pump relay to PDC.
(14) One or more Diagnostic Trouble Codes (DTC's)
may have been stored in PCM memory due to fuel
pump relay removal. The DRBtscan tool must be
used to erase a DTC.
SPECIFICATIONS
FUEL SYSTEM PRESSURE
339 kPa   34 kPa (49.2 psi   5 psi).
TORQUE - FUEL DELIVERY
DESCRIPTION N-m Ft. Lbs. In. Lbs.
Accelerator Pedal Bracket Mounting Nuts
(without adjustable pedals)12  2 - 105  20
Fuel Filter/Fuel Press. Reg. Bolts 3 - 26
Fuel Hose Clamps 3 - 26
Fuel Injector Rail Mounting Bolts -4.0L Engine 11 - 100
Fuel Injector Rail Mounting Bolts -4.7L V-8
Engine11 - 100
Fuel Pump Module Locknut 74 55 -
Fuel Tank Filler Tube-to-Body Mounting Bolts 2 - 15
Fuel Tank-to-Body Mounting Bolts 88 65 -
Fuel Tank Support Bracket Bolts (large brackets) 88 65 -
Fuel Tank Support Bracket Bolts (small bracket) 5 - 45
Fuel Tank Support Bracket Nuts (large brackets) 61 45 -
Fuel Tank Heat Shield Nuts (shield-to-tank) 9 - 85
Fuel Tank Heat Shield Nuts (shield-to-body) 3 - 25
14 - 4 FUEL DELIVERYWJ
FUEL DELIVERY (Continued)

(1) Remove fuel tank. Refer to Fuel Tank Removal/
Installation.(2) Remove fuel pump module. Refer to Fuel Pump
Module Removal/Installation.
(3) Remove electrical wire connector at sending
unit terminals.
(4) Press upward on release tab (Fig. 7) to remove
sending unit from pump module.
INSTALLATION
The fuel gauge sending unit (fuel level sensor) and
float assembly is located on the side of fuel pump
module (Fig. 6). The fuel pump module is located
within the fuel tank.
(1) Position sending unit to pump module and
snap into place.
(2) Connect electrical connector to terminals.
(3) Install fuel pump module. Refer to Fuel Pump
Module Removal/Installation.
(4) Install fuel tank. Refer to Fuel Tank Removal/
Installation.
FUEL LINES
DESCRIPTION
Also refer to Quick-Connect Fittings.
WARNING: THE FUEL SYSTEM IS UNDER A CON-
STANT PRESSURE (EVEN WITH THE ENGINE OFF).
BEFORE SERVICING ANY FUEL SYSTEM HOSES,
FITTINGS OR LINES, THE FUEL SYSTEM PRES-
SURE MUST BE RELEASED. REFER TO THE FUEL
SYSTEM PRESSURE RELEASE PROCEDURE IN
THIS GROUP.
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
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.
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.
Fig. 6 Fuel Gauge Sending Unit Location
1 - FUEL PUMP MODULE
2 - FUEL GAUGE FLOAT
3 - ELECTRIC FUEL PUMP
4 - INLET FILTER
5 - FUEL GAUGE SENDING UNIT
6 - PIGTAIL HARNESS
Fig. 7 Fuel Gauge Sending Unit Release Tab
1 - ELECTRICAL CONNECTOR
2 - FUEL GAUGE SENDING UNIT
3 - RELEASE TAB
4 - FUEL PUMP MODULE
14 - 8 FUEL DELIVERYWJ
FUEL LEVEL SENDING UNIT / SENSOR (Continued)

CAUTION: The left and right fuel rails are replaced
as an assembly. Do not attempt to separate rail
halves at connector tube (Fig. 22). 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.
(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 wiring at rear of generator.
(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 vacuum lines at throttle body.(9) Disconnect electrical connectors at all 8 fuel
injectors. To remove connector refer to (Fig. 23). 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 throttle
body.
(11) Disconnect electrical connectors at MAP and
IAT sensors.
Fig. 21 Fuel Injector Rail/Fuel DamperÐ4.0L Engine
1 - INJ. #1
2 - INJ. #2
3 - INJ. #3
4 - INJ. #4
5 - INJ. #5
6 - INJ. #6
7 - FUEL INJECTOR RAIL
8 - FUEL DAMPER
9 - PRESSURE TEST PORT CAP
10 - MOUNTING BOLTS (4)
11 - QUICK-CONNECT FITTING
Fig. 22 FUEL INJECTOR RAIL - 4.7L V-8 EN
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 CAP
14 - 16 FUEL DELIVERYWJ
FUEL RAIL (Continued)

(19) Disconnect fuel return line at fuel filter/fuel
pressure regulator (Fig. 36). Refer to Quick-Connect
Fittings for procedures.
(20) Disconnect fuel pressure line at fuel filter/fuel
pressure regulator (Fig. 36). Refer to Quick-Connect
Fittings for procedures.
(21) Disconnect EVAP canister vent line near front
of tank (Fig. 36).
(22) Disconnect fuel pump module electrical con-
nector (pigtail harness) near front of tank (Fig. 36).
Harness connector is clipped to body.
(23) Remove left / front tank support bracket bolt
at frame (Fig. 37).
(24)WITHOUT TRAILER HITCH:Remove tank-
to-frame mounting bolts (Fig. 39). Remove rear tank
support bracket bolts at frame (Fig. 38). Carefully
lower tank until clear of vehicle. Place tank on floor.
(25)WITH TRAILER HITCH:Remove tank /
hitch mounting bolts (Fig. 40). Carefully lower tank
until clear of vehicle. Place tank on floor.
(26) If necessary, separate skid plate from fuel
tank by removing 2 fuel tank strap nuts (Fig. 39) and
remove 2 tank straps.
(27) If fuel pump module removal is necessary,
refer to Fuel Pump Module Removal/Installation.
(28) If hoses are to be removed at fuel tank end,
note painted alignment (indexing) markings on
hoses, and molded indexing tangs on tank before
removal. Remove hoses.
(29) If necessary, remove 3 fuel filler tube assem-
bly mounting bolts (Fig. 41) and remove fuel filler
tube.
INSTALLATION
CAUTION: HANDLE EVAP, LDP AND ORVR VAPOR /
VACUUM LINES VERY CAREFULLY. THESE LINES
AND HOSES MUST BE FIRMLY CONNECTED.
CHECK THE VAPOR/VACUUM LINES AT THE LDP,
LDP FILTER, EVAP CANISTER, EVAP CANISTER
PURGE SOLENOID AND ORVR COMPONENTS FOR
DAMAGE OR LEAKS. IF A LEAK IS PRESENT, A
DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET.
(1) If necessary, position fuel filler tube assembly
to body. Install 3 bolts and tighten to 2 N´m (15 in.
lbs.) torque.
(2) If necessary, connect quick-connect fittings to
fuel pump module.
(3) If fuel pump module is being installed, refer to
Fuel Pump Module Removal/Installation.
(4) Install fuel fill/vent hoses to tank fittings. To
prevent hoses from kinking, rotate each hose until
painted indexing mark on hose is aligned to molded
indexing tang on tank.
(5) Install hose clamps to hoses. Refer to Torque
Specifications.(6) If necessary, position fuel tank into skid plate.
Install 2 tank straps and 2 strap nuts (Fig. 39). Refer
to Torque Specifications.
(7) Position fuel tank / skid plate assembly to
hydraulic jack.
(8) Raise tank into position to frame.
(9)WITH TRAILER HITCH:Position trailer
hitch and tow hooks (Fig. 40) to bottom of fuel tank.
Install bolts and nuts loosely.
(10)WITHOUT TRAILER HITCH:Install 2 rear
tank support brackets and bolts (Fig. 38). Install
tank-to-frame bolts. Do not tighten bolts / nuts at
this time.
(11) Install 1 left / front tank support bracket and
bolts / nuts (Fig. 37). Do not tighten bolts / nuts at
this time.
(12) Be sure fuel tank is properly aligned to frame
and body. Tighten all tank, tow hook and trailer
hitch bolts / nuts except for 3 support brackets.
Tighten all 3 (2 rear and 1 left / front) support
bracket bolts / nuts last. Refer to Torque Specifica-
tions.
(13)
(14) Connect fuel pump module pigtail harness
electrical connector near front of tank.
(15) Connect both fuel lines to fuel filter/fuel pres-
sure regulator. Refer to Quick-Connect Fittings for
procedures.
(16) Connect EVAP hose near front of tank.
(17) Position rear axle vent hose and install new
tie strap (Fig. 32).
(18) Install heat shield nuts / bolts (Fig. 35). Refer
to Torque Specifications.
(19) Connect ORVR hose elbow (Fig. 33) to top of
EVAP canister.
(20) Connect fuel vent hose to fuel vent tube (Fig.
32).
(21) Install fuel fill hose and clamp to fuel fill tube
(Fig. 32).
(22) Install 3 LDP mounting bolts (Fig. 29).
(23) While raising support bracket, connect LDP
wiring clip (Fig. 31). Install front section of two-piece
support bracket to rear section with 3 attaching bolts
located on bottom of support bracket (Fig. 30).
(24) Install support bracket brace bolt (Fig. 30).
(25) Tighten 2 support bracket nuts at frame rail
(Fig. 29).
(26) Install fuel tank-to-rear bumper fascia clips
(Fig. 34).
(27) Using new plastic rivets, install stone shield
behind left/rear wheel (Fig. 28).
(28) Install left rear wheel/tire.
(29) Lower vehicle and connect negative battery
cable to battery.
(30) Fill tank with fuel and check for leaks.
14 - 20 FUEL DELIVERYWJ
FUEL TANK (Continued)

INLET FILTER
REMOVAL
The fuel pump inlet filter (strainer) is located on
the bottom of fuel pump module (Fig. 42). The fuel
pump module is located on top of fuel tank.
The fuel pump inlet filter (strainer) is located on
the bottom of fuel pump module (Fig. 42). The fuel
pump module is located on top of fuel tank.
(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 prying from 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 fuel pump module (Fig. 42). The fuel
pump module is located on top of fuel tank.
(1) Snap new filter to bottom of module.
(2) Install fuel pump module. Refer to Fuel Pump
Module Removal/Installation.
(3) Install fuel tank. Refer to Fuel Tank Removal/
Installation.
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 special tool for dis-
connection and removal. Refer to Quick-Connect Fit-
tings 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.
DISCONNECTING
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 line. If repair is necessary, replace complete
fuel line assembly.
(1) Perform fuel pressure release procedure. Refer
to Fuel Pressure Release Procedure.
(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. 43). Press on both buttons
simultaneously for removal. Special tools are not
required for disconnection.
Fig. 42 Fuel Pump Inlet Filter
1 - FUEL PUMP MODULE
2 - FUEL PUMP INLET FILTER
WJFUEL DELIVERY 14 - 27

SPECIFICATIONS
TORQUE - FUEL INJECTION
DESCRIPTION N-m Ft. Lbs. In. Lbs.
Air Cleaner Housing Mount. Nuts 10 93
Air Cleaner Air Duct Clamps 4 35
Air Cleaner Resonator Bolts 4 35
Engine Coolant Temperature SensorÐ4.0L Engine 11 96
Engine Coolant Temperature SensorÐ4.7L Engine 11 96
Fuel Hose Clamps 1 10
IAC Motor-To-Throttle Body BoltsÐ4.0L Engine 7860
IAC Motor-To-Throttle Body BoltsÐ4.7L Engine 7 60
Intake Manifold Air Temp. SensorÐ4.0L Engine 28 20
Intake Manifold Air Temp. SensorÐ4.7L Engine 28 20
MAP Sensor Mounting ScrewsÐ4.0L Engine 3 25
MAP Sensor Mounting ScrewsÐ4.7L Engine 3 25
Oxygen SensorÐAll Engines 30 22
PCM-to-Mounting Bracket Screws 3 25
PCM-to-Mounting Bracket Screws 9 80
Radiator Cooling Fan Relay Bolts 3 25
Throttle Body Mounting BoltsÐ4.0L Engine 11 100
Throttle Body Mounting BoltsÐ4.7L Engine 12 105
TPS Mounting ScrewsÐ4.0L Engine 7 60
TPS Mounting ScrewsÐ4.7L Engine 7 60
ACCELERATOR PEDAL
REMOVAL
The accelerator pedal is connected to the throttle
body linkage by the throttle cable. The cable is pro-
tected by a plastic sheathing and is connected to the
throttle body linkage by a ball socket. It is connected
to the accelerator pedal arm by a plastic retainer
(clip) (Fig. 16). This retainer (clip) snaps into the top
of the accelerator pedal arm. A retainer clip (Fig. 16)
is also used to fasten cable to dash panel.
CAUTION: Be careful not to damage or kink the
cable core wire (within the cable sheathing) while
servicing accelerator pedal or throttle cable.
(1) From inside vehicle, hold up accelerator pedal.
Remove plastic cable retainer (clip) and throttle cable
core wire from upper end of pedal arm. Plastic cable
retainer (clip) snaps into pedal arm.
(2) Remove accelerator pedal bracket nuts. Remove
accelerator pedal assembly.
INSTALLATION
The accelerator pedal is connected to the throttle
body linkage by the throttle cable. The cable is pro-
tected by a plastic sheathing and is connected to the
throttle body linkage by a ball socket. It is connected
to the accelerator pedal arm by a plastic retainer
(clip) (Fig. 16) . This retainer (clip) snaps into the top
of the accelerator pedal arm. A retainer clip (Fig. 16)
is also used to fasten cable to dash panel.
(1) Place accelerator pedal assembly over studs
protruding from floor pan. Tighten mounting nuts to
12 N´m   2 N´m (105 in. lbs.   20 in. lbs.) torque.
(2) Slide throttle cable into opening in top of pedal
arm. Push plastic cable retainer (clip) into pedal arm
opening until it snaps into place.
(3) Before starting engine, operate accelerator
pedal to check for any binding.
WJFUEL INJECTION 14 - 39

HOSES - 4.7L
DESCRIPTION
DESCRIPTION - 1/2º PRESSURE HOSE
The hose consists of two metal ends and a rubber
center with quick connect nuts at both ends. The
hose connects the power steering pump to the
hydraulic fan motor and is clipped to the fan shroud
(Fig. 8). Lubrication must be used on the quick con-
nect nuts and o-rings when installing.
DESCRIPTION - 1/2º RETURN HOSE
The fan motor return line is a molded rubber hose
that is clamped at the hydraulic motor and the power
steering reservoir (Fig. 9).
DESCRIPTION - 3/8º PRESSURE HOSE
The hose consists of two metal ends and two rub-
ber sections one of which contains a tuning cable
(Fig. 10). The hose is clipped in two places to the fan
shroud. Lubrication must be used on the o-rings
when installing.
DESCRIPTION - 3/8º GEAR OUTLET HOSE
The gear outlet line consists of a metal section that
connects to the gear and a rubber section that clamps
to the steering cooler inlet tube (Fig. 11).
DESCRIPTION - 3/8º RETURN HOSE
The return hose is a formed rubber hose that con-
nects the steering cooler outlet tube to the power
steering reservoir (Fig. 12). It is clamped at both
ends.
OPERATION
OPERATION - 1/2º PRESSURE HOSE
The 1/2º pressure hose is used to transfer high
pressure power steering fluid from the power steer-
ing pump to the engine cooling fan motor (Fig. 8).
OPERATION - 1/2º RETURN HOSE
The power steering return line returns low pres-
sure excess flow from the hydraulic fan motor back to
the power steering pump (Fig. 9).
Fig. 8 1/2(PRESSURE HOSE
1 - 1/29PRESSURE HOSE
2 - POWER STEERING PUMP
3 - STEERING GEAR
Fig. 9 1/2(RETURN HOSE
1 - 1/29RETURN HOSE
2 - HOSE CLAMP
Fig. 10 3/8(PRESSURE HOSE
1 - 3/89PRESSURE HOSE
2 - STEERING GEAR
19 - 38 PUMPWJ

(8) Install the transmission in the vehicle.
(9) Fill the transmission with the recommended
fluid.
TRANSMISSION CONTROL
RELAY
DESCRIPTION
The relay is supplied fused B+ voltage, energized
by the TCM, and is used to supply power to the sole-
noid pack when the transmission is in normal oper-
ating mode.
OPERATION
When the relay is ªoffº, no power is supplied to the
solenoid pack and the transmission is in ªlimp-inº
mode. After a controller reset, the TCM energizes the
relay. Prior to this, the TCM verifies that the con-
tacts are open by checking for no voltage at the
switched battery terminals. After this is verified, the
voltage at the solenoid pack pressure switches is
checked. After the relay is energized, the TCM mon-
itors the terminals to verify that the voltage is
greater than 3 volts.
TRANSMISSION RANGE
SENSOR
DESCRIPTION
The Transmission Range Sensor (TRS) is part of
the solenoid module, which is mounted to the top of
the valve body inside the transmission.
The Transmission Range Sensor (TRS) has five
switch contact pins that:
²Determine shift lever position
²Supply ground to the Starter Relay in Park and
Neutral only.
²Supply +12 V to the backup lamps in Reverse
only.
The TRS also has an integrated temperature sen-
sor (thermistor) that communicates transmission
temperature to the TCM and PCM.
OPERATION
The Transmission Range Sensor (TRS) communi-
cates shift lever position to the TCM as a combina-
tion of open and closed switches. Each shift lever
position has an assigned combination of switch states
(open/closed) that the TCM receives from four sense
circuits. The TCM interprets this information and
determines the appropriate transmission gear posi-
tion and shift schedule.
There are many possible combinations of open and
closed switches (codes). Seven of these possible codes
are related to gear position and five are recognized
as ªbetween gearº codes. This results in many codes
which shouldnever occur. These are called
ªinvalidº codes. An invalid code will result in a DTC,
and the TCM will then determine the shift lever
position based on pressure switch data. This allows
reasonably normal transmission operation with a
TRS failure.
GEAR C5 C4 C3 C2 C1
ParkCL OP OP CL CL
Temp 1CL OP OP CL OP
ReverseOP OP OP CL OP
Temp 2OP OP CL CL OP
Neutral 1OP OP CL CL CL
Neutral 2OP CL CL CL CL
Temp 3OP CL CL CL OP
DriveOP CL CL OP OP
Temp 4OP CL OP OP OP
Manual 2CL CL OP OP OP
Temp 5CL OP OP OP OP
Manual 1CL OP CL OP OP
Fig. 117 Checking Torque Converter Seating-Typical
1 - SCALE
2 - STRAIGHTEDGE
21 - 270 AUTOMATIC TRANSMISSION - 545RFEWJ
TORQUE CONVERTER (Continued)