2002 JEEP GRAND CHEROKEE Power

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Page 411 of 2199

JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual The voltage signal produced by the knock sensor
increases with the amplitude of vibration. The PCM
receives the knock sensor voltage signal as an input.
If the signal rises above a predetermined level

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual INSTALLATION
4.7L High-Output Engine Only
NOTE: The left sensor is identified by an identifica-
tion tag (LEFT). It is also identified by a larger bolt
head. The Powertrain Control Module (PCM) must
h

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual OPERATION
The ElectroMechanical Instrument Cluster (EMIC)
is designed to allow the vehicle operator to monitor
the conditions of many of the vehicle components and
operating systems. The gauges and in

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual certain conditions or inputs to provide the vehicle
operator with an audible alert to supplement a visual
indication.
The EMIC circuitry operates on battery current
received through fused B(+) fuses i

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual The VFD is diagnosed using the EMIC self-diag-
nostic actuator test. (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER - DIAGNOSIS AND
TESTING). Proper testing of the PCI data bus and
the data bus message

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual an input from the auto headlamp light sensor to
determine the ambient light levels. If the BCM
decides that the exterior lighting is turned on in the
daylight, it overrides the selected panel dimmer
s

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual the JB and the Power Distribution Center (PDC) as
required.
(3) Check the fused ignition switch output (run-
start) fuse (Fuse 22 - 10 ampere) in the JB. If OK, go
to Step 4. If not OK, repair the sho

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual (3) While still holding the odometer/trip odometer
switch button depressed, turn the ignition switch to
the On position, but do not start the engine.
(4) Release the odometer/trip odometer switch but-