U1651
DTC U1651
Circuit Description
The electronic brake control module (EBCM) monitors the received messages from the steering angle sensor for corruption or for missing messages.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC U1651 Steering Wheel Sensor Malfunction
Conditions for Running the DTC
* The ignition is ON.
* The vehicle speed is greater than 40 km/h (25 mph).
Conditions for Setting the DTC
The EBCM receives a corrupt or a missing message after 100 milliseconds.
Action Taken When the DTC Sets
If equipped, the following actions occur:
* The EBCM disables the traction control system (TCS)/vehicle stability enhancement system (VSES) and for the duration of the ignition cycle.
* A malfunction DTC will set.
* The Stability Off indicator turns ON.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* Using a scan tool.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
Possible causes of this DTC are as follows:
* An open in the CAN HI or CAN LO circuit
* An open in the ignition circuit
* An open in the ground circuit
* A malfunctioning steering angle sensor
* A malfunctioning EBCM
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests the ignition circuit for an open.
3. This step checks the ground circuit for an open.
4. This step tests the CAN HI circuit for an open.
5. This step tests the CAN LO circuit for an open.
6. This step checks the steering angle sensor connector for poor connections.
