Jeep Grand Cherokee WK. Manual — part 334
*NO RESPONSE FROM FDCM (FINAL DRIVE CONTROL MODULE) (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(A926) (A909) (A927) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z901) (Z902) (Z913) GROUND CIRCUIT OPEN
(F921) FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR SHORTED
(D65) CAN C BUS (+) CIRCUIT OPEN
(D64) CAN C BUS (-) CIRCUIT OPEN
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU view.
NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active
on the Bus network. A green check indicates that the module is active on the Bus network.
NOTE: Check the FCM for any active CAN C hardware DTCs, perform DTC before proceeding.
Does the scan tool display a red X next to the module?
Yes
>> Go To 2
No
>> The no response condition is not present at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent , pushed out, and corroded terminals.
2.
FUSED B(+) CIRCUIT OPEN OR SHORTED
Turn the ignition off.
Disconnect the Final Drive Control Module harness connectors.
Using a 12-volt test light connected to ground, check each Fused B(+)
circuit.
Does the test light illuminate brightly for each circuit?
Yes
>> Go To 3
No
>> Repair the Fused B(+) circuit for an open or short.
Perform the FDCM VERIFICATION TEST.
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*NO RESPONSE FROM FDCM (FINAL DRIVE CONTROL MODULE) (CONTINUED)
3.
GROUND CIRCUIT OPEN
Using a 12-volt test light connected to 12-volts, check each Ground
circuit.
Does the test light illuminate brightly for each circuit?
Yes
>> Go To 4
No
>> Repair the ground circuit for an open.
Perform the FDCM VERIFICATION TEST.
4.
(F921) FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR SHORTED
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (F921) Fused
Run Relay Output circuit.
Does the test light illuminate brightly?
Yes
>> Go To 5
No
>> Repair the (F921) Fused Run Relay Output circuit for an
open or short.
Perform the FDCM VERIFICATION TEST.
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*NO RESPONSE FROM FDCM (FINAL DRIVE CONTROL MODULE) (CONTINUED)
5.
(D65) CAN C BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the FCM C1 harness connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between
the FCM connector and the FDCM connector.
Is resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the (D65) CAN C Bus (+) circuit for an open.
Perform the FDCM VERIFICATION TEST.
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*NO RESPONSE FROM FDCM (FINAL DRIVE CONTROL MODULE) (CONTINUED)
6.
(D64) CAN C BUS (-) CIRCUIT OPEN
Measure the resistance of the (D64) CAN C Bus (-) circuit between
the FCM connector and the FDCM connector.
Is resistance below 5.0 ohms?
Yes
>> Replace the Final Drive Control Module in accordance with
the service information.
Perform the FDCM VERIFICATION TEST.
No
>> Repair the (D64) CAN C Bus (-) circuit for an open.
Perform the FDCM VERIFICATION TEST.
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