Jeep Grand Cherokee WK. Manual — part 1059
P1628-SENSOR REFERENCE VOLTAGE 2 CIRCUIT ERRATIC (CONTINUED)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 832
ENGINE ELECTRICAL DIAGNOSTICS
WK
P1646-HYDRAULIC COOLING FAN CONTROL CIRCUIT LOW
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 833
P1646-HYDRAULIC COOLING FAN CONTROL CIRCUIT LOW (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on and engine running.
•
Set Condition:
An open or shorted condition in the Hydraulic Fan Solenoid Control circuit is detected by the Front Control
Module.
Possible Causes
(A916) FUSED B+ CIRCUIT
(K173) HYDRAULID RADIATOR FAN SOLENOID CONTROL CIRCUIT OPEN
(K173) HYDRAULID RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED GROUND
INTEGRATED POWER MODULE
FRONT CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING) .
Diagnostic Test
1.
HYRDRAULIC COOLING FAN OPERATION
Ignition on, engine not running.
Using the scan tool, perform the Hydraulic Fan Solenoid Test.
Does the Hydraulic Cooling Fan operate properly?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
No
>> Go To 2
2.
(A916) FUSED B+ CIRCUIT CHECK
Turn the ignition off.
Disconnect the Hydraulic Cooling Fan Module harness connector.
Using a 12-volt test light connected to ground, probe the (A916) Fused
B+ circuit in the Hydraulic Cooling Fan Module harness connector.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (A916) Fused
B+ circuit
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
9 - 834
ENGINE ELECTRICAL DIAGNOSTICS
WK
P1646-HYDRAULIC COOLING FAN CONTROL CIRCUIT LOW (CONTINUED)
3.
(K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT OPEN BETWEEN THE FAN AND IPM
C2 HARNESS CONNECTOR
Disconnect the IPM C2 40 way connector.
Measure the resistance of the (K173) Hydraulic Radiator Fan Solenoid
control circuit from Fan Module harness connector to the IPM C2 40
way harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the excessive resistance in the (K173) Hydraulic
Radiator Fan Solenoid Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
4.
(K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED TO GROUND BETWEEN
THE FAN AND IPM C2 HARNESS CONNECTOR
Measure the resistance between ground and the (K173) Hydraulic
Radiator Fan Solenoid Control circuit in the Fan Module harness con-
nector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K173) Hydraulic Radia-
tor Fan Solenoid Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 835
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