1988 JEEP CHEROKEE automatic transmission

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child seat jack points automatic transmission buttons oil capacity dashboard

Page 775 of 1378

JEEP CHEROKEE 1988 Service Repair Manual mounted on throttle body and senses angle of throttle blade opening.
A voltage signal of up to 5 volts at wide open throttle is
produced by TPS. Voltage varies with throttle angle changes. Th

mounted on throttle body and senses angle of throttle blade opening.
A voltage signal of up to 5 volts at wide open throttle is
produced by TPS. Voltage varies with throttle angle changes. This
signal is transmitted to ECU where it is used to adjust air/fuel
ratio during acceleration, deceleration, idle, and wide open throttle
conditions.
A dual TPS is used on models with automatic transmissions.
This dual TPS not only provides ECU with input voltages but also
supplies automatic transmission control unit with input signals
relative to throttle position.
Knock Sensor
Knock sensor (detonation sensor) is located on lower left
side of cylinder block just above oil pan. Knock sensor picks up
detonation vibration from engine and converts it to an electrical
signal for use by ECU.
ECU uses this information to determine when a change in
ignition timing is required. Knock sensor allows for engine operation
on either "premium" unleaded or "regular" unleaded fuel.
When knock occurs, ECU retards ignition timing in one or
more cylinders until detonation is eliminated.
Speed Sensor
Speed sensor is secured by special shouldered bolts to
flywheel/drive plate housing. Speed sensor is nonadjustable and
preset at factory. Speed sensor senses TDC and engine speed by
detecting flywheel teeth as they pass pick-up coil during engine
operation. See Fig. 2.
Flywheel has a large trigger tooth and notch located 12
small teeth before each TDC position. When a small tooth and notch
pass the magnetic core in sensor, concentration and collapse of the
magnetic field created induces a small voltage spike into sensor
pick-up coil windings. These small voltage spikes are sent to ECU,
allowing ECU to count the teeth as they pass sensor.
When a large tooth and notch pass magnetic core in sensor,
increased concentration and collapse of the magnetic field induces a
higher voltage spike than smaller teeth. Higher spike indicates to
ECU that a piston will soon be at TDC position, 12 teeth later.
Ignition timing for cylinder is either advanced or retarded by ECU
based upon "sensor input".
Fig. 2: Speed Sensor Operation
Courtesy of Chrysler Motors.
Engine Switches
Several switches provide operating information to ECU. These

Page 776 of 1378

JEEP CHEROKEE 1988 Service Repair Manual include Park/Neutral switch (automatic transmission only), air
conditioning clutch, and Sync Pulse switch. When A/C or Park/Neutral
switches supply ECU with an "on" signal, module signals ISS motor to

include Park/Neutral switch (automatic transmission only), air
conditioning clutch, and Sync Pulse switch. When A/C or Park/Neutral
switches supply ECU with an "on" signal, module signals ISS motor to
change idle speed to a specific RPM.
With A/C on and throttle blade above a specific angle, ECU
de-energizes A/C relay, preventing A/C clutch from engaging until
throttle blade angle is reduced.
Sync pulse switch, located within distributor, generates a
signal to ECU, helping to properly synchronize sequential fuel
injection opening with intake valve opening.
ADJUSTMENTS
NOTE: Idle speed and air/fuel mixture are controlled by ECU and
are non-adjustable. On-car adjustment procedures for other
components should not be necessary during normal vehicle
operation or maintenance. Adjustments of components should
only be required when a faulty component is replaced with a
new one.
THROTTLE POSITION SENSOR (TPS)
1) Turn ignition on. Check throttle position sensor input
voltage. Connect voltmeter negative lead to terminal "B" (M/T), or
terminal "D" (A/T) of sensor connector. Connect voltmeter positive
lead to terminal "A" (M/T and A/T) of sensor connector.
NOTE: On (A/T) models, connector terminals are identified by
letters molded into back of connector. On all models, do not
disconnect TPS harness connector. Insert voltmeter test
leads through back of wire harness connector. On some
models, it may be necessary to remove throttle body from
intake manifold to gain access to sensor wire harness.
2) Move and close throttle plate completely (M/T and A/T).
Ensure throttle linkage contacts stop. Note voltmeter reading. Input
voltage at terminals "B" and "A" (M/T), or terminals "A" and "D"
(A/T) should be 5 volts.
3) Return throttle plate to closed throttle position (M/T
and A/T). Check sensor output voltage. To do so, disconnect voltmeter
positive lead from terminal "A" and connect it to terminal "C" (M/T),
or terminal "B" (A/T).
4) Maintain throttle plate in closed position (M/T and A/T).\
Ensure throttle linkage contacts stop. Note voltmeter reading. Output
voltage should be .8 volt (M/T), or 4.2 volts (A/T).
5) If output voltage is incorrect, loosen bottom sensor
retaining screw and pivot sensor in adjustment slot for a coarse
adjustment. Loosen top sensor retaining screw for fine adjustments.
Tighten screws after adjustment.
TESTING & TROUBLE SHOOTING
PRELIMINARY CHECKS & PRECAUTIONS
Subsystem Checks
The following systems and components must be in good
condition and operating properly before assuming a fuel injection
system malfunction.
* Air filter.
* All support systems and wiring.

Page 904 of 1378

JEEP CHEROKEE 1988 Service Repair Manual * Cold Climate Operation
* Towing Or Heavily Loading
* Severe Dust Conditions
* Sustained High Speed Operation
* Off-Road Driving
* Hot Weather, Stop-And

* Cold Climate Operation
* Towing Or Heavily Loading
* Severe Dust Conditions
* Sustained High Speed Operation
* Off-Road Driving
* Hot Weather, Stop-And-Go Driving
* Extensive Idling Conditions (Taxi Or Delivery Type Service)
Normal Service
* Driven More Than 10 Miles Daily
* No Severe Service Operating Conditions
CAMSHAFT TIMING BELT REPLACEMENT INFORMATION (TURBO-DIESEL)
CAUTION: Failure to replace a faulty camshaft timing belt may result
in serious engine damage.
The condition of camshaft drive belts should always be
checked on vehicles which have more than 50,000 miles. Although some
manufacturers do not recommend belt replacement at a specified
mileage, others require it at 60,000-100,000 miles. A camshaft drive
belt failure may cause extensive damage to internal engine components
on most engines, although some designs do not allow piston-to-valve
contact. These designs are often called "Free Wheeling".
Many manufacturers changed their maintenance and warranty
schedules in the mid-1980's to reflect timing belt inspection and/or
replacement at 50,000-60,000 miles. Most service interval schedules
reflect these changes.
Belts or components should be inspected and replaced if any
of the following conditions exist:
* Cracks Or Tears In Belt Surface
* Missing, Damaged, Cracked Or Rounded Teeth
* Oil Contamination
* Damaged Or Faulty Tensioners
* Incorrect Tension Adjustment
SERVICE LABOR TIMES
SERVICE LABOR TIMES TABLE (HOURS)\
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( 1) 30,000 60,000
Application Mile Service Mile Service
2.1L (Turbo Diesel)
Automatic Transmission ........... 4.3 ................ 4.5
Manual Transmission .............. 3.6 ................ 3.8
2.5L
Automatic Transmission ........... 5.6 ................ 3.5
Manual Transmission .............. 4.9 ................ 3.5
2.8L
Automatic Transmission ........... 5.8 ................ 3.7
Manual Transmission .............. 5.1 ................ 3.7
4.0L
Automatic Transmission ........... 5.7 ................ 3.6
Manual Transmission .............. 5.0 ................ 3.6
( 1) - Add .8 hr. for vehicles equipped with 4WD.
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Page 912 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual Fig. 10: Identification Label Locations Courtesy of American Motors Corp. LUBRICATION SPECIFICATIONS LUBRICATION SPECIFICATIONS TABLE\ \$

Page 913 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Brake Caliper Bushings ....... GE 661 or DOW 111 Silicone Grease
Caliper Slide Pins .......... GE 661 or DOW 111 Silicone Grease
Wheel Bearings ............ Multi-Purpose NLGI Grade 2EP, GC-LB
Dr

Brake Caliper Bushings ....... GE 661 or DOW 111 Silicone Grease
Caliper Slide Pins .......... GE 661 or DOW 111 Silicone Grease
Wheel Bearings ............ Multi-Purpose NLGI Grade 2EP, GC-LB
Drive Shaft U-Joints ...... Multi-Purpose NLGI Grade 2EP, GC-LB
Steering Linkage (4)( 5) ... Multi-Purpose NLGI Grade 2EP, GC-LB
Ball Joints ( 4)( 6) ........ Multi-Purpose NLGI Grade 2EP, GC-LB
Engine Oil Filter (Diesel) ( 7) .... AMC/Jeep (P/N 8983 002 656)
Weatherstrip ......................... Silicone Spray Lubricant
( 1) - SAE 10W-30 SH/CD is preferred.
( 2) - Add 2 Ozs. (59 ml) of Limited-Slip differential lubricant
additive when changing fluid.
( 3) - For vehicles operating under heavy-duty towing conditions,
use SAE 75W-140 Synthetic lube.
NOTE: Before using SAE 75W-140 Synthetic the old fluid must be
DRAINED and FLUSHED with clean mineral based (non-synthetic)
axle lubricant. Then refill with new synthetic lube.
( 4) - Use low pressure grease gun to prevent seal damage.
( 5) - Fill until lubricant squeezes out from the base of seals.
( 6) - Fill ball joint until seal starts to swell.
( 7) - Use of AMC/Jeep Oil Filter is RECOMMENDED.
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FLUID CAPACITIES
FLUID CAPACITIES TABLE\
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Application Quantity ( 1)
A/C System R-12 Refrigerant Capacity ............... 36-40 Ozs.
Automatic Transmission
1984-86 (904 HD)
Fluid Change .............................. 4.0 Qts. (3.8L)
Overhaul (Dry Fill) ....................... 8.0 Qts. (7.6L)
1987-88
Fluid Change .............................. 4.0 Qts. (3.8L)
Overhaul (Dry Fill) ....................... 8.5 Qts. (8.0L)
Cooling System ( 2)
4-Cylinder ................................. 10.0 Qts. (9.5L)
6-Cylinder ................................ 12.0 Qts. (11.4L)
4-Cylinder Turbo Diesel (1985-87) ........... 9.0 Qts. (8.5L)
Engine Oil
4-Cylinder .................................. 4.0 Qts. (3.8L)
6-Cylinder .................................. 6.0 Qts. (5.7L)
4-Cylinder Turbo Diesel (1985-87) ........... 5.5 Qts. (8.5L)
Fuel Tank
Standard ................................. 13.5 Gals. (51.1L)
Optional ................................... 20 Gals. (75.7L)
Manual Transmission ( 3)
AX4 (AISIN) ................................. 7.4 Pts. (3.5L)
T4 (Borg-Warner) ............................ 3.9 Pts. (1.8L)
AX5 (AISIN) ................................. 7.0 Pts. (3.3L)
T5 (Borg-Warner) ............................ 4.5 Pts. (2.1L)
Transfer Case
1985-86
Selec-Trac (229 Full-Time) ................ 6.0 Pts. (2.8L)
Command-Trac (Part-Time 207) .............. 4.5 Pts. (2.1L)
1987
Selec-Trac ................................ 2.5 Pts. (1.2L)
Command-Trac .............................. 2.2 Pts. (1.0L)
1988
Selec-Trac ................................ 3.0 Pts. (1.4L)

Page 962 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Automatic Transmission .......................... Dexron-IIE ATF

Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid

Engine Coolant ........... Alugard 340-2 & Water (50

Automatic Transmission .......................... Dexron-IIE ATF

Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid

Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)

Engine Oil (
1)

Gasoline Engine

Temperature Range

Above 30
F (-1
C) ........ SAE 20W-40 Or 20W-50 API SH/CD

Above 0
F (-18
C) ......... SAE 10W-30 Or 10W-40 API SH/CD

Less Than 60
F (16
C) ............... SAE 5W-30 API SH/CD

Drive Axles ................................ SAE 75W-90 API GL-5

Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5

Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5

Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid

Manual Transmission ........................ SAE 75W-90 API GL-5

Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB

Door & Hood Hinges ............................ Light Engine Oil

Manual Steering Box ............... Multi-Purpose NLGI Grade 2EP

Power Steering Pump ....................... Power Steering Fluid

Transfer Case ................................... Dexron-IIE ATF

Brake Caliper Bushings ........ GE 661 or DOW 111 Silicone Grease

Caliper Slide Pins ........... GE 661 or DOW 111 Silicone Grease

Wheel Bearings .................. Multi-Purpose NLGI Grade GC-LB

Drive Shaft U-Joints .............. Multi-Purpose NLGI Grade 2EP

Steering Linkage (
4)( 5) .................... NLGI Grade 2, GC-LB

Ball Joints (
4)( 6) ......................... NLGI Grade 2, GC-LB

Weatherstrip .......................... Silicone Spray Lubricant

Wheel Lug Nut Torque ...................... 95 ft. lbs. (129 N.m)

(
1) - SAE 10W-30 SH/CD is preferred.

(
2) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant

additive when changing fluid.

(
3) - For vehicles operating under heavy-duty towing conditions,

use SAE 75W-140 Synthetic lube.

NOTE: Before using SAE 75W-140 Synthetic the old fluid must

be DRAINED and FLUSHED with clean mineral based axle

lubricant. Then refill with new synthetic lube.

(
4) - Use low pressure grease gun to prevent seal damage.

(
5) - Fill until lubricant squeezes out from the base of seals.

(
6) - Fill ball joint until seal starts to swell.

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Fluid Capacities

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Application ( 1) Quantity

Automatic Transmission

1984-86 (904 HD)

Fluid Change ............................... 4.0 Qts. (3.8L)

Overhaul (Dry Fill) ........................ 8.0 Qts. (7.6L) \

1987-88

Fluid Change ............................... 4.0 Qts. (3.8L)

Overhaul (Dry Fill) ........................ 8.5 Qts. (8.0L) \

Cooling System (
2)

4-Cylinder .................................. 10.0 Qts. (9.5L)

6-Cylinder ................................. 12.0 Qts. (11.4L)

Engine Oil

4-Cylinder ................................... 4.0 Qts. (3.8L)

6-Cylinder ................................... 6.0 Qts. (5.7L)

Fuel Tank

Standard .................................. 13.5 Gals. (51.1L)

Optional .................................... 20 Gals. (75.7L)

Manual Transmission (
3)

AX4 (AISIN) .................................. 7.4 Pts. (3.5L) \

T4 (Borg-Warner) ............................. 3.9 Pts. (1.8L) \

Page 964 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual Inspect Front Wheel Bearings (4WD) \b\ \ \ \ \ \$

Inspect Front Wheel Bearings (4WD)

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Check Operation of Horn, Wipers/Washers & All Exterior Lights

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Inspect Condition of Wiper Blades

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Check Headlight Alignment

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Check Seat Belt Webbing and Release Mechanisms

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Check Parking Brake Operation

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Check Shift/Clutch Interlock Operation

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Lubricate Weatherstripping with Silicone

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Lubricate Door Hinges

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Lubricate Door Locks

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Check Body Drain Holes

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Rotate Tires and Adjust Air Pressure

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Replace

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Engine Oil

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Oil Filter

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Automatic Transmission Fluid, Filter and Adjust Bands

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Lubrication Specifications

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Application Specification

Automatic Transmission .......................... Dexron-IIE ATF

Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid

Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)

Engine Oil (
1)

Gasoline Engine

Temperature Range

Above 30
F (-1
C) ........ SAE 20W-40 Or 20W-50 API SH/CD

Above 0
F (-18
C) ......... SAE 10W-30 Or 10W-40 API SH/CD

Less Than 60
F (16
C) ............... SAE 5W-30 API SH/CD

Drive Axles ................................ SAE 75W-90 API GL-5

Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5

Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5

Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid

Manual Transmission ........................ SAE 75W-90 API GL-5

Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB

Door & Hood Hinges ............................ Light Engine Oil

Manual Steering Box ............... Multi-Purpose NLGI Grade 2EP

Power Steering Pump ....................... Power Steering Fluid

Transfer Case ................................... Dexron-IIE ATF

Brake Caliper Bushings ........ GE 661 or DOW 111 Silicone Grease

Caliper Slide Pins ........... GE 661 or DOW 111 Silicone Grease

Wheel Bearings .................. Multi-Purpose NLGI Grade GC-LB

Drive Shaft U-Joints .............. Multi-Purpose NLGI Grade 2EP

Steering Linkage (
4)( 5) .................... NLGI Grade 2, GC-LB

Ball Joints (
4)( 6) ......................... NLGI Grade 2, GC-LB

Weatherstrip .......................... Silicone Spray Lubricant

Wheel Lug Nut Torque ...................... 95 ft. lbs. (129 N.m)

Page 965 of 1378

JEEP CHEROKEE 1988 Service Repair Manual

(
1) - SAE 10W-30 SH/CD is preferred.

(
2) - Add 4 ozs. (118 ml) of Limited-Slip differenti

(
1) - SAE 10W-30 SH/CD is preferred.

(
2) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant

additive when changing fluid.

(
3) - For vehicles operating under heavy-duty towing conditions,

use SAE 75W-140 Synthetic lube.

NOTE: Before using SAE 75W-140 Synthetic the old fluid must

be DRAINED and FLUSHED with clean mineral based axle

lubricant. Then refill with new synthetic lube.

(
4) - Use low pressure grease gun to prevent seal damage.

(
5) - Fill until lubricant squeezes out from the base of seals.

(
6) - Fill ball joint until seal starts to swell.

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Fluid Capacities

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Application ( 1) Quantity

Automatic Transmission

1984-86 (904 HD)

Fluid Change ............................... 4.0 Qts. (3.8L)

Overhaul (Dry Fill) ........................ 8.0 Qts. (7.6L) \

1987-88

Fluid Change ............................... 4.0 Qts. (3.8L)

Overhaul (Dry Fill) ........................ 8.5 Qts. (8.0L) \

Cooling System (
2)

4-Cylinder .................................. 10.0 Qts. (9.5L)

6-Cylinder ................................. 12.0 Qts. (11.4L)

Engine Oil

4-Cylinder ................................... 4.0 Qts. (3.8L)

6-Cylinder ................................... 6.0 Qts. (5.7L)

Fuel Tank

Standard .................................. 13.5 Gals. (51.1L)

Optional .................................... 20 Gals. (75.7L)

Manual Transmission (
3)

AX4 (AISIN) .................................. 7.4 Pts. (3.5L) \

T4 (Borg-Warner) ............................. 3.9 Pts. (1.8L) \

AX5 (AISIN) .................................. 7.0 Pts. (3.3L) \

T5 (Borg-Warner) ............................. 4.5 Pts. (2.1L) \

Transfer Case

1985-86

Selec-Trac (229 Full-Time) ................. 6.0 Pts. (2.8L) \

Command-Trac (Part-Time 207) ............... 4.5 Pts. (2.1L) \

1987

Selec-Trac ................................. 2.5 Pts. (1.2L)

Command-Trac ............................... 2.2 Pts. (1.0L)

1988

Selec-Trac ................................. 3.0 Pts. (1.4L)

Command-Trac ............................... 2.2 Pts. (1.0L)

Drive Axles (
3)

Front ........................................ 2.5 Pts. (1.2L)

Front (Disconnect Housing) .................. 5.0 Ozs. (0.15L) \

Rear ......................................... 2.5 Pts. (1.2L)

Rear (Trac-Lok) (
4) .......................... 2.5 Pts. (1.2L)

(
1) - Capacities are recommended or calculated levels. Always use

dipstick (if available) to measure level.

(
2) - Includes 2.3 qts. for coolant recovery bottle.

(
3) - Fill to bottom of filler plug hole.

(
4) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant

additive first, then add new fluid.

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