Jeep Grand Cherokee WK. Manual — part 296
*BOTH CAN C DIAGNOSTIC (+) AND CAN C DIAGNOSTIC (-) CIRCUITS OPEN (CONTINUED)
2.
(D72) CAN C DIAGNOSTIC (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the Front Control Module C1 harness connector.
Disconnect the scan tool from the DLC.
NOTE: Check the connectors at both the DLC and the FCM.
Measure the resistance of the (D72) CAN C Diagnostic (+) circuit
between the FCM connector and the DLC.
Is the resistance below 5.0 ohms?
Yes
>> Go To 3
No
>> Repair the (D72) CAN C Diagnostic (+) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
WK
*BOTH CAN C DIAGNOSTIC (+) AND CAN C DIAGNOSTIC (-) CIRCUITS OPEN (CONTINUED)
3.
(D71) CAN C DIAGNOSTIC (-) CIRCUIT OPEN
Measure the resistance of the (D71) CAN C Diagnostic (-) circuit
between the FCM connector and the DLC.
Is the resistance below 5.0 ohms?
Yes
>> Inspect the wiring and connectors for damage or shorted
circuits. If ok, replace the Front Control Module in accor-
dance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Repair the (D71) CAN C Diagnostic (-) circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
WK
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 31
U0001-CAN C BUS CIRCUIT
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
WK
U0001-CAN C BUS CIRCUIT (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The FCM detects a short in either CAN C Bus circuit.
Possible Causes
(D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND
(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND
(D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE
(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE
(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT
ANTILOCK BRAKE MODULE
POWERTRAIN CONTROL MODULE
SHIFT LEVER ASSEMBLY
STEERING CONTROL MODULE
FINAL DRIVE CONTROL MODULE
ENGINE CONTROL MODULE (DIESEL ONLY)
TRANSMISSION CONTROL MODULE (3.7L/DIESEL ONLY)
FRONT CONTROL MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase FCM DTC’s.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active FCM DTC’s.
Does the scan tool display U0001–CAN C BUS CIRCUIT as active?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring and connectors.
WK
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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