ABS

U0002-CAN C BUS OFF PERFORMANCE

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
The FCM detects a detects a CAN C Bus Off Performance message.





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/schematic as a guide, inspect the wiring and connectors.

2. ANTI-LOCK BRAKE MODULE - INTERNAL SHORT
Turn the ignition off.

NOTE: Answer yes if the vehicle is not equipped with this module.

Disconnect the Anti-Lock Brake Module harness connector.
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 3

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test

3. POWERTRAIN CONTROL MODULE - INTERNAL SHORT
Turn the ignition off.

NOTE: Answer yes if the vehicle is not equipped with this module.

Disconnect the Powertrain Control Module C1 harness connector.
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 4

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Powertrain Control Module.
- Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test

4. SHIFT LEVER ASSEMBLY (IF EQUIPPED) - INTERNAL SHORT
Turn the ignition off.

NOTE: Answer yes if the vehicle is not equipped with this module.

Disconnect the Shift Lever Assembly harness connector.
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 5

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Shift Lever Assembly.
- Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Transmission Verification Test

5. STEERING CONTROL MODULE - INTERNAL SHORT
Turn the ignition off.

NOTE: Answer yes if the vehicle is not equipped with this module.

Disconnect the Steering Control Module C1 harness connector.
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 6

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Steering Control Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test

6. FINAL DRIVE CONTROL MODULE (IF EQUIPPED)- INTERNAL SHORT
Turn the ignition off.

NOTE: Answer yes if the vehicle is not equipped with this module.

Disconnect the Final Drive Control Module C2 harness connector.
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 7

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Final Drive Control Module.
- Perform FDCM VERIFICATION TEST.

7. ENGINE CONTROL MODULE (DIESEL ONLY) - INTERNAL SHORT
Turn the ignition off.

NOTE: Answer yes if the vehicle is not equipped with this module.

Disconnect the Engine Control Module harness connectors.
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 8

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Engine Control Module.
- Perform POWERTRAIN VERIFICATION TEST VER - 1. Powertrain Verification Test

8. TRANSMISSION CONTROL MODULE (3.7L/DIESEL ONLY) - INTERNAL SHORT
Turn the ignition off.

NOTE: Answer yes if the vehicle is not equipped with this module.

Disconnect the Transmission Control Module C2 harness connector.
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 9

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Transmission Control Module.
- Perform the appropriate TRANSMISSION VERIFICATION TEST. Verification Tests

9. (D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE




Turn the ignition off.
Disconnect the Front Control Module C1 harness connector.
Turn the ignition on.
Measure the voltage between the (D65) CAN C Bus (+) circuit and ground.
Is there any voltage present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Go To 10

10. (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 voltage.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Go To 11

11. (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.Body Verification Test.

No

- Go To 12

12. (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.Body Verification Test.

No

- Go To 13

13. (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.Body Verification Test.

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Front Control Module.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.