U1003
U1003-ESP CAN C BUS PERFORMANCE
NOTE: The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.
- When Monitored:
With the ignition on.
- Set Condition:
If the Anti-Lock Brake System (ABS) Module detects too many CAN Bus off events on the Dynamics Sensor Data Link circuits.
1. CHECK FOR A DTC U1003-ESP CAN C BUS PERFORMANCE
NOTE: This DTC must be active for the results of this test to be valid.
NOTE: If present, diagnose and repair DTC U0125-LOST COMMUNICATION WITH DYNAMICS SENSOR before diagnosing this DTC.
1. Turn the ignition on.
2. Using the scan tool, read and record the DTCs.
3. Using the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. Using the scan tool, erase the DTCs.
5. Start the engine.
NOTE: Attempt to operate the vehicle under conditions similar to which the DTC was set. It may be necessary to test drive the vehicle within the DTC monitoring and set conditions in order for this DTC to set.
6. Using the scan tool, read and record the DTCs
Does the scan tool display: U1003-ESP CAN C BUS PERFORMANCE?
Yes
- Go To 2
No
- Perform the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.
2. CHECK THE WIRING HARNESS, TERMINALS, AND CONNECTORS
NOTE: The Sensor Cluster is the same as the Dynamics sensor.
1. Check the Dynamics Sensor installation and torque of the mounting bolts.
2. Visually inspect the related wiring harness. Look for any bruised, chafed, pierced, or partially broken wires.
3. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Were any problems found?
Yes
- Repair as necessary.
- Perform the 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. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Disconnect the Dynamics Sensor harness connector.
4. Turn the ignition on.
5. 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 the 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 between ground and the (D465) Dynamics Sensor High Data Link circuit.
Is the resistance below 5.0 Ohms?
Yes
- Repair the (D465) Dynamics Sensor High Data link circuit for a short to ground.
- Perform the 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.
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 the 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 the 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 between ground and the (D464) Dynamics Sensor Low Data Link circuit.
Is the resistance below 5.0 Ohms?
Yes
- Repair the (D464) Dynamics Sensor Low Data link circuit for a short to ground.
- Perform the 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.
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 the ABS VERIFICATION TEST. ABS Verification Test.
9. REPLACE DYNAMICS SENSOR & VERIFY IF DTC IS STILL ACTIVE
1. Replace the Dynamics Sensor. Perform the 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.Using the scan tool, read ABS DTCs.
Does this DTC reset?
Yes
- Replace the Anti-Lock Brake System (ABS) Module.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.
No
- Test complete.