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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 520 (Anti-Lock Brake System) >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Test >> Pinpoint Test G: DTC C1277 and C1278 - Steering Wheel Angle 1 and 2 Circuit Failure/Faulted >> Pinpoint Test G: DTC C1277 And C1278 - Steering Wheel Angle 1 And 2 Circuit Failure/Faulted

Pinpoint Test G: DTC C1277 And C1278 - Steering Wheel Angle 1 And 2 Circuit Failure/Faulted

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Over tightening 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 two fasteners. A loose sensor or missing fastener may result in incorrect sensor operation. Examine the sensor/disk interface to make sure that the disk rotates freely within the slot of the sensor. Examine the disk for physical damage or blocked holes near the disk perimeter. 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. G1 CARRY OUT THE RECALIBRATION PROCEDURE 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Clear the DTCs.
    • Carry out the steering wheel rotation sensor recalibration procedure following the diagnostic tool directions.
    • Test drive the vehicle.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve DTCs.
    • Are any DTCs retrieved or does the recalibration procedure indicate a fault? 

    Result/Action to Take 

    Yes 

    If DTC C1277 or C1278 is retrieved or the recalibration procedure indicates a fault, GO to G2.

    If any other DTCs are retrieved, GO to THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .

    If sent here from Pinpoint Test M, GO to G2.

    No 

    The ABS system is operating correctly.

  2. G2 MONITOR THE STEERING WHEEL ROTATION SENSOR PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: ABS Module PIDs.
    • Monitor the ABS module steering wheel rotation sensor PID while rotating the steering wheel clockwise and counterclockwise very slowly.
    • Do the PIDs move in intervals of 4.5°? 

    Yes 

    CLEAR the DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If DTC C1277 or C1278 is still present, GO to G12.

    No 

    GO to G3.

  3. G3 CHECK CIRCUIT 640 (RD/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Steering Wheel Rotation Sensor C226.
    • Key in ON position.
    • Measure the voltage between the steering wheel rotation sensor C226-1, circuit 640 (RD/YE), harness side and ground.
      Fig 1: Checking Circuit 640 For Open
      G03826484Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Result/Action to Take 

    Yes 

    GO to G4.

    No 

    REPAIR the circuit. CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

  4. G4 CHECK THE STEERING WHEEL ROTATION SENSOR CIRCUITRY FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: ABS Module C155.
    • Measure the resistance between the ABS module connector, harness side and the steering wheel rotation sensor connector, harness side as follows:
      C149 CONNECTOR CIRCUIT DESCRIPTIONS

      Steering Wheel Rotation Sensor Connector-Pin ABS Module Connector-Pin Circuit
      C226-2 C155-10 1573 (YE)
      C226-3 C155-39 1572 (DG)
      C226-4 C155-24 1571 (BK)
    • Are the resistances less than 5 ohms? 

    Yes 

    GO to G5.

    No 

    REPAIR the circuit(s) in question. CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

  5. G5 CHECK THE STEERING WHEEL ROTATION SENSOR CIRCUITS FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between the ABS module connector, harness side and ground as follows:
      ABS MODULE CONNECTOR-PIN AND CIRCUIT CONNECTION DETAILS

      ABS Module Connector-Pin Circuit
      C155-10 1573 (YE)
      C155-39 1572 (DG)
      C155-24 1571 (BK)
    • Is any voltage present? 

    Yes 

    REPAIR the circuit(s) in question. CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

    No 

    GO to G6.

  6. G6 CHECK THE STEERING WHEEL ROTATION SENSOR CIRCUITRY FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the ABS module connector, harness side and ground as follows:
      ABS MODULE CONNECTOR-PIN AND CIRCUIT CONNECTION DETAILS

      ABS Module Connector-Pin Circuit
      C155-10 1573 (YE)
      C155-39 1572 (DG)
      C155-24 1571 (BK)
    • Are the resistances greater than 10,000 ohms? 

    Result/Action to Take 

    Yes 

    GO to G7.

    No 

    REPAIR the circuit in question. CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

  7. G7 CHECK FOR VOLTAGE TO THE STEERING WHEEL ROTATION SENSOR 
    • Connect: ABS Module C155.
    • Connect: Steering Wheel Rotation Sensor C226.
    • Key in ON position.
    • With the connector connected, backprobe the connector while measuring the voltage between the steering wheel rotation sensor C226-1, circuit 640 (RD/YE), harness side and the steering wheel rotation sensor C226-4, circuit 1571 (BK), harness side.
      Fig 2: Checking Steering Wheel Rotation Sensor Voltage
      G03826485Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

    GO to G9.

    No 

    GO to G8.

  8. G8 CHECK THE STEERING WHEEL ROTATION SENSOR FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Steering Wheel Rotation Sensor C226.
    • Key in ON position.
    • Measure the voltage between the steering wheel rotation sensor C226-1, circuit 640 (RD/YE), harness side and the steering wheel rotation sensor C226-4, circuit 1571 (BK), harness side.
      Fig 3: Checking Steering Wheel Rotation Sensor For Short To Ground
      G03826486Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes 

    INSTALL a new steering wheel rotation sensor. CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

    No 

    GO to G12.

  9. G9 CHECK THE STEERING WHEEL ROTATION SENSOR OUTPUT SIGNAL A 
    • Key in OFF position.
    • Connect: ABS Module C155.
    • Connect: Steering Wheel Rotation Sensor C226.
    • Key in ON position.
    • With the connector connected, backprobe the connector while measuring the voltage between the steering wheel rotation sensor C226-3, circuit 1572 (DG), harness side and the steering wheel rotation sensor C226-4, circuit 1571 (BK), harness side while rotating the steering wheel slightly.
      Fig 4: Checking Steering Wheel Rotation Sensor Output Signal A
      G03826487Courtesy of FORD MOTOR CO.
    • Is the voltage between 0.25 volts and 0.75 volts or between 4.00 volts and 4.75 volts with the steering wheel stationary and change to the other state when rotating the steering wheel slightly? 

    Yes 

    GO to G10.

    No 

    GO to G11.

  10. G10 CHECK THE STEERING WHEEL ROTATION SENSOR OUTPUT SIGNAL B 
    • With the connector connected, backprobe the connector while measuring the voltage between the steering wheel rotation sensor C226-2, circuit 1573 (YE), harness side and the steering wheel rotation sensor C226-4, circuit 1571 (BK), harness side while rotating the steering wheel slightly.
      Fig 5: Checking Steering Wheel Rotation Sensor Output Signal B
      G03826488Courtesy of FORD MOTOR CO.
    • Is the voltage between 0.25 volts and 0.75 volts or between 4.00 volts and 4.75 volts with the steering wheel stationary and change to the other state when rotating the steering wheel slightly? 

    Yes 

    CLEAR the DTCs. DRIVE the vehicle. RETRIEVE the DTCs. If DTC C1277 or C1278 is still present, GO to G12.

    No 

    GO to G11.

  11. G11 CHECK FOR STEERING WHEEL ROTATION SENSOR REFERENCE VOLTAGE 
    • Key in OFF position.
    • Disconnect: Steering Wheel Rotation Sensor C226.
    • Key in ON position.
    • Measure the voltage between the steering wheel rotation sensor C226-3, circuit 1572 (DG), harness side and the steering wheel rotation sensor C226-4, circuit 1571 (BK), harness side; and between the steering wheel rotation sensor C226-2, circuit 1573 (YE), harness side and the steering wheel rotation sensor C226-4, circuit 1571 (BK), harness side.
      Fig 6: Checking Steering Wheel Rotation Sensor Reference Voltage
      G03826489Courtesy of FORD MOTOR CO.
    • Are the voltages between 4.75 volts and 5.25 volts? 

    Yes 

    INSTALL a new steering wheel rotation sensor. CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

    No 

    GO to G12.

  12. G12 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect the ABS module connector.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect the ABS module connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes 

    INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

    No 

    The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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