check engine light JEEP CHEROKEE 1988 Service Owner's Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1988, Model line: CHEROKEE, Model: JEEP CHEROKEE 1988Pages: 1378, PDF Size: 19.9 MB
Page 791 of 1378
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FU EL IN JE C TIO N S YSTE M - T B I
1 988 J e ep C hero ke e
1988 Electronic Fuel Injection
JEEP/RENIX THROTTLE BODY INJECTION
2.5L Cherokee, Comanche, Wagoneer, Wrangler
DESCRIPTION
The Throttle Body Injection (TBI) system is a single
injector system that introduces fuel into throttle body from above
throttle plate. Fuel injector, located within throttle body, is
controlled by the Electronic Control Unit (ECU).
The ECU is a sealed microprocessor that receives input
signals from several sensors and other related engine components.
Based on these inputs, ECU generates output signals that control and
adjust air/fuel mixture and ignition timing as necessary for proper
engine performance.
ECU also controls engine idle speed, emission control
systems, upshift indicator light (manual transmission only), and A/C
compressor clutch.
OPERATION
ELECTRONIC CONTROL UNIT (ECU)
On Cherokee, Comanche and Wagoneer, ECU is located under
instrument panel, above accelerator pedal. On Wrangler, ECU is
located behind glove box. Input information from various engine
sensors to ECU is used to determine engine operating conditions and
needs. Battery voltage input is used to ensure that correct output
voltage is supplied by ECU during fluctuations in battery voltage.
FUEL INJECTOR
Fuel injector is mounted in throttle body so that fuel is
injected into incoming airflow. When injector solenoid is energized,
armature and plunger move upward against spring. Check ball above
injector nozzle moves off seat and opens small orifice at end of
injector.
Fuel supplied to injector is forced around ball and through
orifice, resulting in fine spray of fuel. Volume of fuel injected is
dependent only on length of time that injector is energized by ECU,
as fuel pressure is constant at injector. During cold engine starts,
extra fuel is supplied so richer mixture will aid in starting.
FUEL PRESSURE REGULATOR
Fuel pressure regulator is integral part of throttle body.
Pressure regulator has a spring chamber that is vented to same
pressure as tip of injector. Because differential pressure between
injector nozzle and spring chamber is same, only the length of time
that injector is energized controls volume of fuel injected.
Fuel pump delivers more fuel than is required by engine.
Excess fuel goes to fuel tank from pressure regulator via fuel return
hose. Fuel pressure regulator function is mechanical and ECU does not
control it.
FUEL PUMP
Page 801 of 1378
NOTE: When diagnosing fuel system problems using following
procedures, no specialized service equipment is needed.
Following diagnostic procedures are NOT applicable if
special tester M.S. 1700 is used.
Six different test flow charts are used to fully evaluate
fuel injection system:
TEST 1: IGNITION OFF
This test checks that system power provides for ECU memory
keep-alive voltage.
TEST 2: IGNITION ON: POWER
This test checks system power function and fuel pump power
function.
TEST 3 & 3A: IGNITION ON: INPUT
These tests check the following components and their
circuits: closed throttle (idle) switch, Throttle Position Sensor
(TPS), MAP sensor, A/T gear selector switch, Coolant Temperature
Sensor (CTS) and MAT sensor. Coolant temperature and MAT sensors are
tested in cold condition. This procedure also checks all interrelated
wiring circuits as well.
TEST 4 & TEST 4A: SYSTEM OPERATIONAL
These tests check engine start-up circuit, fuel injector,
"Closed Loop" air/fuel mixture function, coolant temperature sensor
function, MAT sensor function, detonation sensor "Closed Loop"
ignition retard/advance function, EGR valve and canister purge
solenoid function, idle speed control and A/C control functions.
TEST 5: BASIC ENGINE
This test indicates failures in related engine components
that are not part of fuel injection system.
TEST 6: MANUAL TRANSMISSION UPSHIFT
This test checks upshift indicator light function on vehicles
with manual transmissions.
Fig. 5: Jeep/Renix Fuel Injection ECU Connector
Courtesy of Chrysler Motors.
REMOVAL & INSTALLATION
Page 864 of 1378
Fig. 15. With a hot idle condition, the voltage reading should drop to
between 0.5-1.5 volts.
3) Test ECU terminal "C-6" for the same voltage as described
in step 2) to verify the wiring harness. Repair as necessary.
4) Test the MAP sensor supply voltage at the sensor connector
terminal "C" with the ignition ON. Voltage reading should be between
4.5-5.5 volts. Check that the voltage reading at terminal "C-14" is
also 4.5-5.5 volts.
5) Repair or replace the wire harness as necessary.
6) Test the MAP sensor ground circuit at the sensor connector
terminal "A" and ECU connector terminal "D-3". Repair the wire harness
as necessary.
7) Using an ohmmeter, test the MAP sensor ground circuit at
the ECU connector between terminal "D-3" and terminal "B-ll". If an
open circuit is indicated, check for a defective sensor ground
connection. The MAP sensor ground is located on the right side of the
engine block.
8) If, after performing step 7), the ground connection is
verified to be good, check for a short to 12 volts at terminal "D-3".
If a short is found, repair the short and then replace the ECU.
KNOCK SENSOR TEST
1) Connect Diagnostic Tester M.S. 1700 to the vehicle.
2) Go to "State Display" mode.
3) Start the engine and let idle.
4) Observe knock sensor value.
5) Using the tip of a screwdriver, lightly tap the cylinder
block near the sensor while observing the knock sensor value.
6) The knock sensor value should increase when the cylinder
block is tapped.
7) If the knock sensor value does not increase while tapping
on the cylinder block near the knock sensor, check for proper
connections to the knock sensor. If connections are good, replace
the knock sensor. Refer to REMOVAL & INSTALLATION in this article.
ENGINE SPEED SENSOR TEST
1) Disconnect the engine speed sensor connector from the
ignition control module.
2) place an ohmmeter between terminals "A" and "B" (marked on\
the connector). On a hot engine, the resistance reading should be
between 125-275 ohms.
3) Replace sensor if readings are not within specification.
Fig. 16: View of Engine Speed Sensor Connectors (At Sensor)
Courtesy of Chrysler Motors.
Page 906 of 1378
the ENGINE PERFORMANCE section.
Fuel filter should be drained whenever "WATER IN FUEL"
warning light glows. Diesel fuel can damage asphalt and
painted surfaces. Always place a drain pan under fuel filter
to collect contaminated fuel. See Fig. 2.
1) Stop vehicle and turn engine off. Attach a long piece
of tubing to drain cock outlet. Place end of drain hose into
drain pan. Open filter assembly vent valve (Black + shaped
knob) and drain cock.
2) Drain approximately 1/2 pint (.24 Liters) from fuel
filter. Close vent valve and drain cock. Start engine and
check for leaks. If "WATER IN FUEL" warning lamp comes on
again, remove water contaminated fuel from fuel lines and
fuel tank.
WARNING: DO NOT bleed fuel lines on hot engine, as high exhaust
temperatures could cause fire. Use care when bleeding fuel
lines, as fuel is under extreme pressure and could penetrate
skin, causing personal injury. Wear safety goggles and
protective clothing when bleeding fuel lines.
CAUTION: DO NOT drain fuel/water separator when engine is running or
hot. Allow engine to cool before draining. Verify that the
WATER IN FUEL light on instrument panel is OFF.
Fig. 3: Locking Crankshaft at TDC
Courtesy of American Motors/Jeep Corp.
Page 964 of 1378
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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 980 of 1378
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Fuel Filter")
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Fuel Filter
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Emission System Vacuum Hoses
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Ignition Wires
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Distributor Cap & Rotor
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Battery
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(
1) - Replacement is recommended by Chrysler at this time, but it
is not required to maintain the warranty on the PCV valve.
(
2) - Check and replace as needed.
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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)
(
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
Page 985 of 1378
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Check Drive Shaft Seals
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Lube Drive Shaft U-Joints and Slip Splines
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Lube Front Axle Drive Joint and Pivot Bearings (4WD)
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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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Manual Transmission Fluid
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Automatic Transmission Fluid, Filter and Adjust Bands
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Transfer Case Fluid
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Flush and Fill Engine Coolant, if not done in last 24 months
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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 987 of 1378
![JEEP CHEROKEE 1988 Service Owners Manual 82,500 MILE (132,000 KM) SERVICE
82,500 MILE (132,000 KM) SERVICE \
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82,500 MILE (132,000 KM) SERVICE
82,500 MILE (132,000 KM) SERVICE \
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Service Or Inspect
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Verify Last Major Service Was Performed
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Check Fluid Levels
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Check Cooling System Hoses and Clamps
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Check Exhaust System & Heat Shielding
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Inspect Brake System
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Inspect C/V Joint boots (4WD)
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Inspect Underside of Vehicle (Bolts & Threaded Fasteners)
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Check/Lube Manual Steering Gear
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Check Drive Shaft Seals
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Lubricate Ball Joints, Steering Linkage & Suspension
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Lube Drive Shaft U-Joints and Slip Splines
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Lube Front Axle Drive Joint and Pivot Bearings (4WD)
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Rotate Tires and Adjust Air Pressure (Including Spare)
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Replace
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Engine Oil
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Oil Filter, if it has not been changed in the last 12 months
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O2 Sensor (1987-89)
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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
Page 995 of 1378
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Clean Battery and Battery Terminals
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Inspect Brake System
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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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Inspect C/V Joint boots (4WD)
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Inspect Underside of Vehicle (Bolts & Threaded Fasteners)
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Check/Lube Manual Steering Gear
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Check Drive Shaft Seals
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Lubricate Ball Joints, Steering Linkage & Suspension
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Lube Drive Shaft U-Joints and Slip Splines
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Lube Front Axle Drive Joint and Pivot Bearings (4WD)
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Inspect Front Wheel Bearings (4WD)
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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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Flush and Fill Engine Coolant, if not done in last 24 months
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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
Page 998 of 1378
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\b\
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\
\
\
\
\
Inspect/Repack Front Wheel Bearings (2WD Models)
\b\
\
\
\
\
\
\
Inspect Front Brake Pads & Rotors
\b\
\
\
\
\
\
\
Lubricate Caliper Slide Rails
\b\
\
\
\
\
\
\
Inspect Rear Brake Linings & Drums
\b\
\
\
\
\
\
\
Inspect Brake System Hoses & Lines
\b\
\
\
\
\
\
\
Inspect Shocks for Leakage
\b\
\
\
\
\
\
\
Inspect Tire Wear Pattern
\b\
\
\
\
\
\
\
Lubricate Weatherstripping with Silicone
\b\
\
\
\
\
\
\
Lubricate Door Hinges
\b\
\
\
\
\
\
\
Lubricate Door Locks
\b\
\
\
\
\
\
\
Check Body Drain Holes
\b\
\
\
\
\
\
\
Rotate Tires and Adjust Air Pressure
\
\
\
\
\
\
\
Replace
\
\
\
\
\
\
\
Engine Oil
\b\
\
\
\
\
\
\
Oil Filter, if it has not been changed in the last 12 months
\b\
\
\
\
\
\
\
Manual Transmission Fluid
\b\
\
\
\
\
\
\
Automatic Transmission Fluid, Filter and Adjust Bands
\b\
\
\
\
\
\
\
Transfer Case Fluid
\b\
\
\
\
\
\
\
Flush and Fill Engine Coolant, if not done in last 24 months
\
\
\
\
\
\
\
Lubrication Specifications
\
\
\
\
\
\
\
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