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Pinpoint Test E: DTC C1278 - Steering Wheel Angle 1 And 2 Circuit Faulted

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
CAUTION: Overtightening of the steering wheel rotation sensor fasteners may deform or damage the sensor housing, possibly resulting in faulty operation.
NOTE: Make sure that the steering wheel rotation sensor is mounted securely to the column with 2 fasteners. A loose sensor or missing fastener may result in incorrect sensor operation. Make sure that the sensor connector is mated securely to the harness connector. Before proceeding with electrical testing, make sure that the vehicle battery is fully charged.
  1. E1 CALIBRATE THE ABS MODULE AND CHECK FOR DTCs 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Clear the ABS module DTCs
    • Carry out the ABS module calibration procedure following the scan tool directions.
    • Test drive the vehicle.
    • Retrieve and record any ABS module DTCs.
    • Are any ABS module DTCs retrieved or does the calibration procedure indicate a fault? 
    1. YES  : If DTC C1278 is retrieved or the calibration procedure indicates a fault, go to  E2.

      If any other ABS module DTCs are retrieved, go to the ABS MODULE DTC CHART .

    2. NO  : If any network concerns or network DTCs present, REFER to MODULE COMMUNICATIONS NETWORK to diagnose the HS-CAN bus.

      If there are no network concerns or network DTCs present, the system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.

  2. E2 CHECK THE STEERING ANGLE SENSOR MODULE FOR DTCs 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Clear the steering angle sensor module DTCs
    • Test drive the vehicle.
    • Retrieve and record any steering angle sensor module DTCs.
    • Are any DTCs retrieved? 
    1. YES  : Go to the STEERING ANGLE SENSOR MODULE DTC CHART .
    2. NO  : Go to  E3.
  3. E3 MONITOR THE STEERING WHEEL ROTATION SENSOR PID 
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger/ABS Module PID: Steering Wheel Angle (SWA_POS)
    • Monitor the SWA POS PID while rotating the steering wheel clockwise and counterclockwise very slowly.
    • Does the PID move in intervals of 1 degree? 
    1. YES  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
    2. NO  : INSTALL a new steering wheel rotation sensor. REFER to Steering Wheel Rotation Sensor . CALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
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