Jeep Grand Cherokee WK. Manual — part 1138
*NO RESPONSE WITH A NO START CONDITION
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ENGINE ELECTRICAL DIAGNOSTICS
WK
*NO RESPONSE WITH A NO START CONDITION (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(A209) PCM FUSED B+ CIRCUIT
PCM NO RESPONSE
(F1) (F942) (F26) PCM FUSED IGNITION SWITCH OUTPUT CIRCUITS
(Z816) (Z130) PCM GROUND CIRCUITS
CRANKSHAFT POSITION SENSOR
(F855) 5-VOLT SENSOR OPEN/SHORTED
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
PCM
Diagnostic Test
1.
(A209) PCM FUSED B+ CIRCUIT
NOTE: The scan tool and cable must be operating properly for
the results of this test to be valid.
NOTE: Make sure the ignition switch was on while trying to com-
municate with the PCM.
Turn the ignition off.
Disconnect the C1 PCM harness connector.
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Using a 12-volt test light connected to ground probe the appropriate
terminal of special tool #8815.
Does the test light illuminate brightly?
Yes
>> Go To 2
No
>> Repair the open or short to ground in the (A209) Fused
B+ circuit. Inspect and replace fuses as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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*NO RESPONSE WITH A NO START CONDITION (CONTINUED)
2.
(F942), (F1), (F26) PCM FUSED IGNITION SWITCH CIRCUITS
Using a 12-volt test light connected to ground, probe the (F942), (F1),
(F26) PCM Fused Ignition Switch Output circuit in the appropriate ter-
minals of special tool #8815.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the (F942), (F1), (F26) Ignition Switch Output cir-
cuit. Inspect and replace fuses as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
3.
(Z130), (Z816) PCM GROUND CIRCUITS
Using a 12-volt test light connected to battery voltage, probe the
(Z130), (Z816) PCM ground circuits in the appropriate terminals of
special tool #8815.
Does the test light illuminate brightly?
Yes
>> Go To 4
No
>> Repair the (Z130), (Z816) PCM ground circuits.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
*NO RESPONSE WITH A NO START CONDITION (CONTINUED)
4.
(F855) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Connect the PCM harness connectors.
Disconnect the Crankshaft Position Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit.
Is the voltage between 4.5 and 5.2 volts?
Yes
>> Go To 5
No
>> Go To 6
5.
CKP SENSOR
Turn the ignition off.
Disconnect the TP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit in the TP Sen-
sor harness connector.
Is the voltage between 4.5 and 5.2 volts?
Yes
>> If communication is available with a PCM on a like vehicle,
replace and program the Powertrain Control Module per
Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace the Crankshaft Position Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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