U1650
DTC U1650
Circuit Description
The controller area network (CAN) serial data circuit is a high speed serial data bus used to communicate information between the steering angle sensor and the electronic brake control module (EBCM). When the ignition switch is turned to the ON position, the module and the steering angle sensor begin to transmit data between each other.
The CAN bus circuit is monitored continuously after the ignition switch is turned to the ON position.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC U1650 Steering Wheel Sensor CAN 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
Line interruptions are detected by the CAN message monitor.
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 indicator turns ON.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* Using a scan tool clear, DTC function.
* 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:
* CAN HI and CAN LO circuits shorted together
* CAN HI or CAN LO circuit shorted to ground
* CAN HI or CAN LO circuit shorted to voltage
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for a short to ground between the CAN HI and CAN LO circuits.
3. This step tests the CAN HI and CAN LO circuits for a short together.
4. This test checks to see if steering angle sensor is centered.
