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Home >> Lincoln >> 2011 >> MKS EcoBoost >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Anti-Lock Brake System - Vehicle Dynamic Systems >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test H: DTCs C1278, C1956, C1963 and C1975 >> PINPOINT TEST H: DTCs C1278, C1956, C1963 AND C1975

PINPOINT TEST H: DTCs C1278, C1956, C1963 AND C1975

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: 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. H1 CHECK THE ABS MODULE DTCs 
    • Review the ABS module DTCs retrieved while carrying out the steps in Inspection and Verification.
    • Is DTC C1963 and/or C1975 present? 
    • Yes  : GO to H2.
    • No  : GO to  H6.
  2. H2 VERIFY THE VEHICLE STEERING SYSTEM TYPE 
    NOTE: Steering system type can be identified by checking for the presence of a power steering pump. Vehicles equipped with EPAS do not have a power steering pump.
    • Verify the type of steering system the vehicle is equipped with, HPAS or EPAS.
    • Is the vehicle equipped with HPAS? 
    • Yes  : GO to  H6.
    • No  : GO to H3.
  3. H3 VERIFY THE VEHICLE IS EQUIPPED WITH ACTIVE PARK ASSIST 
    • Verify that the vehicle is equipped with Active Park Assist by checking for the presence of the Active Park Assist button on the center console.
    • Is the vehicle equipped with Active Park Assist? 
    • Yes  : GO to H4.
    • No  : GO to  H5.
  4. H4 CHECK FOR SASM DTCs 
    • Connect the scan tool.
    • Enter the following diagnostic mode on the scan tool: Self Test - SASM.
    • Retrieve and record any SASM DTCs.
    • Are any SASM DTCs present? 
  5. H5 CHECK FOR PSCM DTCs 
    • Connect the scan tool.
    • Enter the following diagnostic mode on the scan tool: Self Test - PSCM.
    • Retrieve and record any PSCM DTCs.
    • Are any PSCM DTCs present? 
  6. H6 MONITOR THE STEERING WHEEL ANGLE (SWA) PID 
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS.
    • Monitor the SWA PID while rotating the steering wheel clockwise and counterclockwise very slowly, from lock to lock.
    • Do the PIDs change in intervals of 1 degree and show a 360 degree increase for each complete revolution of the steering wheel? 
    • Yes  : GO to H7.
    • No  : GO to  H8.
  7. H7 CHECK FOR RETURNING DTCs 
    • Clear the ABS module DTCs.
    • Drive the vehicle above 48 km/h (30 mph) with input from the steering wheel.
    • Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
    • Retrieve and record any ABS module DTCs.
    • Are any ABS module DTCs present? 
    • Yes  : If DTCs C1277, C1278, C1963 or C1975 are present,

      GO to H8.

      For all other DTCs, GO to the ABS MODULE DTC TABLE .

    • No  : The condition is not present at this time. INSPECT the rotation sensor and the slotted-wheel for cracks, looseness and foreign material. REPAIR or INSTALL new as necessary. CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test. If DTCs C1963 and/or C1975 return, GO to PINPOINT TEST I .
  8. H8 CHECK THE STEERING WHEEL ROTATION SENSOR CONDITION AND INSTALLATION 
    • Inspect the steering wheel rotation sensor and slotted-wheel for damage and correct installation. Refer to STEERING WHEEL ROTATION SENSOR .
    • Are the sensor and toothed-wheel installed correctly and undamaged? 
    • Yes  : GO to H9.
    • No  : REINSTALL or INSTALL new as necessary. CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test. If DTCs C1963 and/or C1975 return, GO to PINPOINT TEST I .
  9. H9 CHECK FOR VOLTAGE AT THE STEERING WHEEL ROTATION SENSOR 
    • Ignition OFF.
    • Disconnect: Steering Wheel Rotation Sensor C226.
    • Ignition ON.
    • Measure the voltage between steering wheel rotation sensor C226-4, circuit CBP35 (YE/GY), harness side and ground.
      Fig 1: Measuring Voltage Between Steering Wheel Rotation Sensor C226-4, Circuit CBP35 (YE/GY) And Ground
      G07813771Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to H10.
    • No  : VERIFY SJB fuse 35 (10A) is OK. If OK, REPAIR circuit CBP35 (YE/GY). If not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify possible causes of the circuit short. CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
  10. H10 CHECK THE SENSOR RETURN CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: ABS Module C135.
    • Measure the resistance between steering wheel rotation sensor C226-1, circuit RCS06 (BN/VT), harness side and ABS module C135-12, circuit RCS06 (BN/VT), harness side.
      Fig 2: Checking Sensor Return Circuit For Open
      G07813772Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to H11.
    • No  : REPAIR circuit RCS06 (BN/VT). CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
  11. H11 CHECK THE SENSOR SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between ground and:
      • steering wheel rotation sensor C226-3, circuit VCS07 (VT/OG), harness side.
      • steering wheel rotation sensor C226-2, circuit VCS06 (GY/BN), harness side.
        Fig 3: Measuring Voltage Between Ground And Steering Wheel Rotation Sensor C226-3, Circuit VCS07 (VT/OG)
        G07813773Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes  : REPAIR the affected circuit(s). CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
    • No  : GO to H12.
  12. H12 CHECK THE SENSOR SIGNAL CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between ground and:
      • steering wheel rotation sensor C226-3, circuit VCS07 (VT/OG), harness side.
      • steering wheel rotation sensor C226-2, circuit VCS06 (GY/BN), harness side.
        Fig 4: Measuring Voltage Between Ground And Steering Wheel Rotation Sensor C226-3, Circuit VCS07 (VT/OG)
        G07813774Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
    • Yes  : GO to H13.
    • No  : REPAIR the affected circuit(s). CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
  13. H13 CHECK THE SENSOR SIGNAL CIRCUITS FOR AN OPEN 
    • Measure resistance between the steering wheel rotation sensor C226, harness side and ABS module C135, harness side using the following table:
      CIRCUIT REFERENCE TABLE

      Steering Wheel Rotation Sensor Circuit ABS Module
      C226-3 VCS07 (VT/OG) C135-29
      C226-2 VCS06 (GY/BN) C135-8
      Fig 5: Checking Sensor Signal Circuits For Open
      G07813775Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to H14.
    • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  14. H14 CHECK THE SENSOR SIGNAL CIRCUITS FOR A SHORT TOGETHER 
    • Measure the resistance between steering wheel rotation sensor C226-3, VCS07 (VT/OG), harness side and steering wheel rotation sensor C226-2, circuit VCS06 (GY/BN), harness side.
      Fig 6: Checking Sensor Signal Circuits For Short Together
      G07813776Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : If sent here because DTC C1963 and/or C1975 are present, GO to PINPOINT TEST I .

      For all other instances, INSTALL a new steering wheel rotation sensor. REFER to STEERING WHEEL ROTATION SENSOR . CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.

    • No  : REPAIR the affected circuit(s). CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
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