U1004
U1004-CAN C BUS TRANSMIT PERFORMANCE
For a complete wiring diagram, refer to the Wiring Information. Electrical Diagrams
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:
When the Anti-Lock Brake System (ABS) Module detects invalid CAN message from the Dynamics Sensor.
1. CHECK FOR A DTC U1004-CAN C BUS TRANSMIT PERFORMANCE
NOTE: This DTC must be active for the results of this test to be valid.
1. Ignition on, engine not running.
2. Using the scan tool, read and record DTCs.
3. Using the scan tool, read and record Freeze Frame information.
4. Using the scan tool, erase DTCs.
5. Cycle the ignition switch from off to on.
6. Using the scan tool, read and record DTCs
Does the scan tool display: U1004-CAN C BUS TRANSMIT PERFORMANCE?
Yes
- Go To 2
No
- Perform the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.
2. CHECK THE WIRING HARNESS, TERMINALS, AND CONNECTORS
1. Check the Dynamic 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 Dynamics Sensor harness connector.
3. Disconnect the Anti-Lock Brake System (ABS) Module harness connector.
4. Ignition on, engine not running.
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. (D465) DYNAMICS SENSOR HIGH DATA LINK CIRCUIT SHORTED 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. Ignition on, engine not running.
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
- Replace the Dynamics Sensor.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.
No
- Repair the (D464) Dynamics Sensor High Data Link circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.