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Brakes






U0002-CAN C BUS OFF PERFORMANCE

For a complete wiring diagram Refer to Diagrams/Electrical. Diagrams By Number


- When Monitored:

With the ignition on.

- Set Condition:

The FCM detects a short in either CAN C Bus circuit.







Diagnostic Test


1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE 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.

Disconnect the Anti-Lock Brake Module harness connector.

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 3

No

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


3. POWERTRAIN CONTROL MODULE - INTERNAL SHORT

Turn the ignition off.

Disconnect the Powertrain Control Module C1 harness connector.

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes, with Floor Shift

- Go To 4

Yes, with Column Shift

- Go To 5

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. Verification Tests


4. SHIFTER LEVER ASSEMBLY (NAG1 ONLY)- INTERNAL SHORT

Turn the ignition off.


NOTE: If the vehicle is not equipped with a NAG1 controller then skip this step.

Disconnect the Shifter Lever Assembly harness connector.

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 6

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Shifter Lever.
- Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests


5. ELECTRONIC SHIFT MODULE (COLUMN NAG1)- INTERNAL SHORT

Turn the ignition off.


NOTE: If the vehicle is not equipped with a NAG1 controller then skip this step.

Disconnect the Electronic Shift Module harness connector.

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 6

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Electronic Shift Module.
- Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests


6. TRANSMISSION CONTROL MODULE (NAG1 ONLY)- INTERNAL SHORT

Turn the ignition off.


NOTE: If the vehicle is not equipped with a NAG1 controller then skip this step.

Disconnect the Transmission Control Module C2 harness connector.

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 7

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Transmission Control Module.
- Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests


7. ENGINE CONTROL MODULE (DIESEL)- INTERNAL SHORT

Turn the ignition off.

Disconnect the Engine Control Module C2 harness connector.

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE 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 the ECM VERIFICATION TEST. Verification Tests


8. STEERING CONTROL MODULE - INTERNAL SHORT

Turn the ignition off.

Remove the Steering Control Module.

Turn the ignition on.

With the scan tool, record and erase FCM DTCs.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active FCM DTCs.

Does the scan tool display U0002-CAN C BUS OFF PERFORMANCE as active?

Yes

- Go To 9

No

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


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. Verification Tests

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. Verification Tests

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. Verification Tests

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. Verification Tests

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. Verification Tests

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. Verification Tests
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