U1003

U1003-ESP CAN C BUS PERFORMANCE





For a complete wiring diagram Refer to the Wiring Information.

- When Monitored:
Continuously.

- Set Condition:
One of the CAN messages that is assigned to the basic CAN channel was missed by the CAN driver. This means that the whole system was very slow in responding to the CAN interrupts.





1. DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, clear DTCs in the ABS Module.
3. Cycle the ignition from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
4. With the scan tool, select View DTCs in the Anti-lock Brake Module.

Does the DTC reset and/or remain active?

Yes

- Go to 2

No

- Go to 6

2. CAN C BUS DTCs SET IN TOTALLY INTEGRATED POWER MODULE (TIPM)
1. With the scan tool, select View DTCs in the TIPM.

Are there any active CAN C Bus DTCs?

Yes

- Perform the appropriate diagnostic procedures. Testing and Inspection.

No

- Go to 3

3. (D52) CAN C BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Disconnect the TIPM C7 harness connector.
4. Measure the resistance of the (D52) CAN C Bus (+) circuit between the ABS Module harness connector and the TIPM C7 harness connector.

Is the resistance above 2.0 ohms?

Yes

- Repair the (D52) CAN C Bus (+) circuit for an open.
- Perform ABS VERIFICATION TEST.ABS Verification Test

No

- Go to 4

4. (D51) CAN C BUS (-) CIRCUIT OPEN




1. Measure the resistance of the (D51) CAN C Bus (-) circuit between the ABS Module harness connector and the TIPM C7 harness connector.

Is the resistance above 2.0 ohms?

Yes

- Repair the (D51) CAN C Bus (-) circuit for an open.
- Perform ABS VERIFICATION TEST.ABS Verification Test

No

- Go to 5

5. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Inspect the wiring between the ABS Module harness connector and the TIPM harness connector. If any problems are found, repair as necessary. If no problems are found, view repair.

Repair

- Replace the Anti-lock Brake System (ABS) Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test

6. INTERMITTENT ESP CAN C BUS PERFORMANCE DTC
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
3. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
4. Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes

- Repair as necessary.
- Perform ABS VERIFICATION TEST.ABS Verification Test

No

- Test complete.