Seconds JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual

JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual GRAND CHEROKEE 2002 WJ / 2.G JEEP JEEP https://www.carmanualsonline.info/img/16/7175/w960_7175-0.png JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual The PCM determines injector on-time (pulse width)
based on various inputs.
DIAGNOSIS AND TESTING - FUEL INJECTOR
To perform a complete test of the fuel injectors and
their circuitry, use the DRB scan

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual The PCM uses the IAC motor to control idle speed
(along with timing) and to reach a desired MAP dur-
ing decel (keep engine from stalling).
The IAC motor has 4 wires with 4 circuits. Two of
the wires

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual MAP SENSOR
DESCRIPTION
DESCRIPTION
On the 4.0L six-cylinder engine the MAP sensor is
mounted to the engine throttle body. On the 4.7L V-8
engine the MAP sensor is mounted to front of the
intake manifo

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual The other two heater elements (downstream sen-
sors 1/2 and 2/2) are controlled by the downstream
heater relay through output signals from the PCM.
To avoid a large simultaneous current surge, power
i

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual (8) Start engine and let idle long enough to circu-
late power steering fluid through flow/pressure test
gauge.
(9) Shut off the engine and check the fluid level,
add fluid as necessary. Start engine

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual (11) Increase the engine speed to 1100 rpm and
read the flow meter. The reading should be 2.6 GPM
minimum, if the reading is below this specification,
the pump should be replaced.
FLOW AND PRESSURE TE

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual DIAGNOSIS AND TESTING - PUMP LEAKAGE
(1) Possible areas of pump leakage (Fig. 3).
STANDARD PROCEDURE
STANDARD PROCEDURE - INITIAL OPERATION
- 4.0L
WARNING: THE FLUID LEVEL SHOULD BE
CHECKED WITH ENGIN

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual DIAGNOSIS CHARTS
CONDITION POSSIBLE CAUSES CORRECTION
HARSH
ENGAGEMENT
(FROM NEUTRAL TO
DRIVE OR REVERSE)1. Fluid Level Low. 1. Add Fluid
2. Throttle Linkage Mis-adjusted. 2. Adjust linkage - setting

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual Normal calibration will be performed when sump
temperature is above 50 degrees F, or in the absence
of sump temperature data, after the first 10 minutes
of vehicle operation. Calibration of the pressu

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Repair Manual PROCEDURE TWO
(1) Start engine and apply parking brake.
(2) Shift the transmission into DRIVE for approxi-
mately 2 seconds.
(3) Shift the transmission into REVERSE for
approximately 2 seconds.
(4) Sh