Jeep Grand Cherokee WK. Manual — part 983
P0480-COOLING FAN 1 CONTROL CIRCUIT (CONTINUED)
3.
LOW SPEED RADIATOR FAN RELAY RESISTANCE
Measure the resistance of the Low Speed Radiator Fan Relay Coil.
Is the resistance between 60 to 80 ohms?
Yes
>> Go To 4
No
>> Replace the Low Speed Radiator Fan Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(N201) COOLING FAN NO.1 CONTROL CIRCUIT OPEN
Disconnect the C3 FCM harness connector.
Measure the resistance of the (N201) Cooling Fan No.1 Relay Control circuit from the Relay to the C3 FCM harness
connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (N201) Cooing Fan No.1 Relay Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.
(N201) COOLING FAN NO.1 CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (N201) Cooling Fan No.1 Relay Control circuit at the Relay con-
nection.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (N201) Cooling Fan No.1 Relay Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
FRONT CONTROL MODULE
NOTE: Before continuing, check the FCM 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 BODY VERIFICATION TEST-VER 1.
No
>> Replace Front Control Module per Service Information.
Perform BODY VERIFICATION TEST-VER 1.
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0481-COOLING FAN 2 CONTROL CIRCUIT
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 529
P0481-COOLING FAN 2 CONTROL CIRCUIT (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
•
Set Condition:
An open or shorted circuit is detected in the radiator fan relay control circuit. One Trip Fault. Three good trips
to turn off the MIL.
Possible Causes
(A16) FUSED B+ CIRCUITS
(N112) COOOLING FAN NO.2 RELAY CONTROL CIRCUIT OPEN
(N112) COOOLING FAN NO.2 RELAY CONTROL CIRCUIT SHORTED TO GROUND
HIGH SPEED RADIATOR FAN RELAY
FRONT CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
HIGH SPEED RADIATOR FAN RELAY OPERATION
Ignition on, engine not running.
With a scan tool, actuate the High Speed Radiator Fan Relay.
Is the Cooling Fan Relay operating?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
(A16) FUSED B+ CIRCUITS
Turn the ignition off.
Remove the High Speed Radiator Fan Relay.
Using a 12-volt test light connected to ground, probe the (A16) Fused B+ circuits in the Relay connection.
Is the voltage above 11.0 volts?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (A16) Fused B+ circuits. Inspect the related fuse and repair
as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0481-COOLING FAN 2 CONTROL CIRCUIT (CONTINUED)
3.
HIGH SPEED RADIATOR FAN RELAY RESISTANCE
Measure the resistance of the High Speed Radiator Fan Relay Coil.
Is the resistance between 60 to 80 ohms?
Yes
>> Go To 4
No
>> Replace the Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(N112) COOLING FAN NO.2 CONTROL CIRCUIT OPEN
Disconnect the C3 FCM harness connectors.
Measure the resistance of the (N112) Cooling Fan No.2 Relay Control circuit from the Relay connection to the C3
FCM harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (N112) Cooling Fan No.2 Relay Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.
(N112) COOLING FAN NO.2 CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (N112) Cooling Fan No.2 Relay Control circuit at the Relay con-
nection.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (N112) Cooling Fan No.2 Relay Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
FRONT CONTROL MODULE
NOTE: Before continuing, check the FCM 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 BODY VERIFICATION TEST-VER 1.
No
>> Replace the Front Control Module per Service Information.
Perform BODY VERIFICATION TEST-VER 1.
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 531
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