Jeep Grand Cherokee WK. Manual — part 1038
P0693-COOLING FAN 2 RELAY CONTROL CIRCUIT LOW (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on and the High Speed Radiator Fan Relay is powered on.
•
Set Condition:
The FCM detects and open or short in the Cooling Fan No.2 Relay Control circuit. The circuit is continuously
monitored.
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 BODY VERIFICATION TEST-VER 1.
9 - 748
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0693-COOLING FAN 2 RELAY CONTROL CIRCUIT LOW (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 IPM FCM 49 way harness connector.
Measure the resistance of the (N112) Cooling Fan No.2 Relay Control circuit from the Relay connection to the IPM
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 BODY VERIFICATION TEST-VER 1.
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 BODY VERIFICATION TEST-VER 1.
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 - 749
P0694-COOLING FAN 2 RELAY CONTROL CIRCUIT HIGH
9 - 750
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0694-COOLING FAN 2 RELAY CONTROL CIRCUIT HIGH (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on with the Cooling Fan No.2 Relay powered on.
•
Set Condition:
The FCM detects the Cooling Fan No.2 Relay voltage above the acceptable voltage at the FCM. The circuit is
continuously monitored.
Possible Causes
(N112) COOLING FAN NO.2 RELAY CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
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.
LOW 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.
(N112) COOLING FAN NO.2 RELAY CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Remove the High Speed Radiator Fan Relay.
Disconnect the IPM FCM 49 way harness connector.
Ignition on, engine not running.
Measure the voltage on the (N112) Cooling Fan No.2 Relay Control Circuit at the Relay terminal.
Is the voltage above 0 volts?
Yes
>> Repair the short to battery voltage in the (N112) Cooling Fan No.2 Relay Control circuit.
Perform BODY VERIFICATION TEST-VER 1.
No
>> Go To 3
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 High Speed Radiator Fan Relay.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 751
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