U1003

U1003-ESP CAN C BUS PERFORMANCE

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.





- When Monitored:
With the ignition on.

- Set Condition:
When the Anti-Lock Brake Module detects too many CAN Bus off events.





1. VERIFY DTC IS ACTIVE

WARNING: On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury

NOTE: If present, diagnose and repair DTC U0125 LOST COMMUNICATION WITH DYNAMICS SENSOR before diagnosing this DTC.

1. Turn the ignition on.
2. With the scan tool, read and record DTCs.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase DTCs.
5. Start the engine.
6. With the scan tool, read DTCs.

Does this DTC reset?

Yes

- Go To 2

No

- Perform the ABS-INTERMITTENT CONDITION TEST ABS Intermittent Condition Test.

2. INSPECT RELATED WIRING HARNESS, TERMINALS, AND CONNECTORS
1. Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.
2. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, and corroded terminals.

Were any problems found?

Yes

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

No

- Go To 3

3. CHECK THE (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE




1. Disconnect the Anti-Lock Brake Module harness connector.
2. Disconnect the Dynamics Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (D465) Dynamics Sensor High Data Link circuit.

Is there any voltage present?

Yes

- Repair the (D465) Dynamics Sensor High Data Link circuit for a short to voltage.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Go To 4

4. CHECK THE (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Measure the resistance of the (D465) Dynamics Sensor High Data Link circuit between ground and the Dynamics Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes

- Repair the (D465) Dynamics Sensor High Data Link circuit for a short to ground.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Go To 5

5. CHECK THE (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT FOR AN OPEN




1. Measure the resistance of the (D465) Dynamics Sensor High Data Link circuit between the Dynamics Sensor harness connector and the Anti-Lock Brake Module harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 6

No

- Repair the (D465) Dynamics Sensor High Data Link circuit for an open.
- Perform ABS VERIFICATION TEST ABS Verification Test.

6. CHECK THE (D464) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (D464) Dynamics Sensor Low Data Link circuit.

Is there any voltage present?

Yes

- Repair the (D464) Dynamics Sensor Low Data Link circuit for a short to voltage.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Go To 7

7. CHECK THE (D464) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Measure the resistance of the (D464) Dynamics Sensor Low Data Link circuit between ground and the Dynamics Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes

- Repair the (D464) Dynamics Sensor Low Data Link circuit for a short to ground.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Go To 8

8. CHECK THE (D464) DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR AN OPEN




1. Measure the resistance of the (D464) Dynamics Sensor Low Data Link circuit between the Dynamics Sensor harness connector and the Anti-Lock Brake Module harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 9

No

- Repair the (D464) Dynamics Sensor Low Data Link circuit for an open.
- Perform ABS VERIFICATION TEST ABS Verification Test.

9. REPLACE DYNAMICS SENSOR & VERIFY IF DTC IS STILL ACTIVE
1. Replace the Dynamics Sensor. Perform ABS VERIFICATION TEST ABS Verification Test
2. Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 25 km/h (6 and 15 mph).
3. Park the vehicle.With the scan tool, read ABS DTCs.

Does this DTC reset?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Test complete.