Circuit Description
The controller area network (CAN) circuits provide a communication network between the electronic brake control module (EBCM), steering wheel position sensor, yaw rate sensor, and the data link connector (DLC).
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC U0126 CAN Steering Position Sensor Circuit Malfunction
Conditions for Running the DTC
DTC U0126 can be set anytime the ignition switch is in the ON position.
Conditions for Setting the DTC
The EBCM does not receive data from the steering wheel position sensor.
Action Taken When the DTC Sets
| • | The ABS warning indicator turns ON. |
| • | The vehicle stability control (VSC) warning indicator turns ON. |
| • | The VSC and traction control is disabled. |
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
| • | An open or high resistance in the steering wheel position sensor ground circuit |
| • | An open, high resistance, or short to ground in the steering wheel position sensor ignition voltage |
| • | A steering wheel position sensor malfunction |
If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the steering wheel position sensor ground circuit for an open or high resistance.
-
This step tests the steering wheel position sensor ignition voltage circuit for an open, high resistance or short to ground.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Test the steering wheel position sensor ground circuit for an open or high resistance. Did you find and correct the condition? | -- | Go to Step 5 | Go to Step 3 | |
Test the steering wheel position sensor ignition voltage circuit for an open, high resistance, or short to ground. Did you find and correct the condition? | -- | Go to Step 5 | Go to Step 4 | |
4 | Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 5 | -- |
5 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
