Jeep Grand Cherokee WK. Manual — part 186
U0002-CAN C BUS OFF PERFORMANCE (CONTINUED)
8.
(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE
Measure the voltage between the (D64) CAN C Bus (-) circuit and
ground.
Is there any voltage present?
Yes
>> Repair the (D64) CAN C Bus (-) circuit for a short to volt-
age.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 9
9.
(D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (D65) CAN C Bus (+)
circuit.
Is any resistance present?
Yes
>> Repair the (D65) CAN C Bus (+) circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 10
10.
(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (D64) CAN C Bus (-)
circuit.
Is any resistance present?
Yes
>> Repair the (D64) CAN C Bus (-) circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 11
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
U0002-CAN C BUS OFF PERFORMANCE (CONTINUED)
11.
(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT
Measure the resistance between the (D65) CAN C Bus (+) circuit and
the (D64) CAN C Bus (-) circuit.
Is any resistance present?
Yes
>> Repair the (D65) CAN C Bus (+) circuit for a short to the
(D64) CAN C Bus (-) circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Inspect the wiring and connectors for damage or shorted
circuits. If ok, replace and program the Front Control Mod-
ule in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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U0100-LOST COMMUNICATION WITH ECM/PCM
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
U0100-LOST COMMUNICATION WITH ECM/PCM (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the ignition on
•
Battery voltage between 10 and 16 volts
•
IOD fuse installed
•
FCM is configured correctly
•
Set Condition:
Bus messages not received from the ECM/PCM for approximately 500ms.
Possible Causes
CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
FCM NOT CONFIGURED CORRECTLY
ECM/PCM
ECM/PCM POWER AND GROUND
MODULE THAT SET THIS DTC
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
With the scan tool, read active DTCs.
Is this DTC active?
Yes
>> Go To 2
No
>> Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
Perform BODY VERIFICATION TEST – VER 1.
2.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read all active DTCs from all modules.
NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or igni-
tion related DTCs.
Does the scan tool display any active DTCs to the conditions listed above?
Yes
>> Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms.
Perform BODY VERIFICATION TEST – VER 1.
No
>> Go To 3
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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