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Home >> Ford >> 2011 >> Focus S, Standard >> 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 G: DTCs B2741, C1279, C1280, C1281, C1282, C2777, C2778 and U1901 >> PINPOINT TEST G: DTCs B2741, C1279, C1280, C1281, C1282, C2777, C2778 AND U1901

PINPOINT TEST G: DTCs B2741, C1279, C1280, C1281, C1282, C2777, C2778 AND U1901

NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
NOTE: The vehicle must be on level ground, not on a hoist and at a complete standstill when calibrating the sensor cluster and reading PIDs. Any vehicle movement will result in false values for this test.
  1. G1 CARRY OUT THE SENSOR CLUSTER CALIBRATION PROCEDURE 
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Chassis - Interactive Vehicle Dynamics (IVD) Initialization.
    • Following the scan tool directions, carry out the IVD Initialization sequence.
    • Test drive the vehicle above 20 km/h (12 mph), making several tight circles and hard-braking maneuvers.
    • Retrieve and record any ABS module DTCs.
    • Does the IVD Initialization sequence indicate a fault or are DTCs B2741, C1279, C1280, C1281, C1282, C2769, C2770, C2777, C2778 and/or U1901 present? 
      • Yes  : If the IVD Initialization sequence indicates a fault, GO to G2.

        For DTCs B2741, C1279, C1280, C1281, C1282, C2777, C2778 and U1901, GO to  G3.

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

      • No  : The system is operating correctly at this time. The concern may have been caused by an incorrect or incomplete IVD Initialization sequence. CLEAR the DTCs. REPEAT the self-test.
  2. G2 CHECK THE SENSOR CLUSTER CONDITION AND INSTALLATION 
    NOTE: When correctly installed, the stability control sensor cluster electrical connector will be facing the rear of the vehicle.
    • Inspect the sensor cluster for damage and correct installation. Refer to STABILITY CONTROL SENSOR CLUSTER .
    • Is the sensor cluster installed correctly and undamaged? 
      • Yes  : GO to G3.
      • No  : REINSTALL or INSTALL new as necessary. CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
  3. G3 CHECK THE VOLTAGE TO THE SENSOR CLUSTER 
    • Disconnect: Stability Control Sensor Cluster C3073.
    • Ignition ON.
    • Measure the voltage between sensor cluster C3073-4, circuit CCA09 (VT/BN), harness side and ground.
      Fig 1: Measuring Voltage Between Sensor Cluster C3073-4, Circuit CCA09 (VT/BN) And Ground
      G06063942Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : GO to  G6.
      • No  : GO to G4.
  4. G4 CHECK THE SENSOR SUPPLY VOLTAGE FOR AN OPEN OR EXCESSIVE RESISTANCE 
    • Ignition OFF.
    • Disconnect: ABS Module C155.
    • Measure the resistance between ABS module C155-22, circuit CCA09 (VT/BN), harness side and sensor cluster C3073-4, circuit CCA09 (VT/BN), harness side.
      Fig 2: Measuring Resistance Between ABS Module C155-22, Circuit CCA09 (VT/BN) And Sensor Cluster C3073-4, Circuit CCA09 (VT/BN)
      G06438592Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to G5.
      • No  : REPAIR circuit CCA09 (VT/BN). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
  5. G5 CHECK THE SENSOR VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between sensor cluster C3073-4, circuit CCA09 (VT/BN), harness side and ground.
      Fig 3: Measuring Resistance Between Sensor Cluster C3073-4, Circuit CCA09 (VT/BN), Harness Side And Ground
      G06438593Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes  : GO to  G14.
      • No  : REPAIR circuit CCA09 (VT/BN). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
  6. G6 CHECK THE SENSOR SIGNAL RETURN CIRCUIT FOR A SHORT TO VOLTAGE 
    • Disconnect: ABS Module C155.
    • Measure the voltage between sensor cluster C3073-1, circuit RCA09 (GN/VT), harness side and ground.
      Fig 4: Measuring Voltage Between Sensor Cluster C3073-1, Circuit RCA09 (GN/VT), Harness Side And Ground
      G06438594Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes  : REPAIR circuit RCA09 (GN/VT). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
      • No  : GO to G7.
  7. G7 CHECK THE SENSOR GROUND CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Measure the resistance between ABS module C155-29, circuit RCA09 (GN/VT), harness side and sensor cluster C3073-1, circuit RCA09 (GN/VT), harness side.
      Fig 5: Measuring Resistance Between ABS Module C155-29, Circuit RCA09 (GN/VT) And Sensor Cluster C3073-1, Circuit RCA09 (GN/VT)
      G06438595Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes  : GO to G8.
      • No  : REPAIR circuit RCA09 (GN/VT). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
  8. G8 CHECK THE SENSOR SIGNAL RETURN CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between sensor cluster C3073-1, circuit RCA09 (GN/VT), harness side and ground.
      Fig 6: Measuring Resistance Between Sensor Cluster C3073-1, Circuit RCA09 (GN/VT), Harness Side And Ground
      G07802580Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes  : GO to G9.
      • No  : REPAIR circuit RCA09 (GN/VT). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
  9. G9 CHECK THE SENSOR CLUSTER CAN CIRCUITS FOR AN OPEN 
    • Measure the resistance between ABS module C155, harness and sensor cluster C3073, harness side using the following chart:
      ABS Module Circuit Sensor Cluster
      C155-19 VCA24 (GN/OG) C3073-2
      C155-18 VCA23 (BU/WH) C3073-3
      Fig 7: Measuring Resistance Between ABS Module C155, Harness And Sensor Cluster C3073, Harness Side
      G06438597Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
      • Yes  : GO to G10.
      • No  : REPAIR the affected circuit(s). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
  10. G10 CHECK THE SENSOR CLUSTER CAN CIRCUITS FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between ground and:
      • sensor cluster C3073-2, circuit VCA24 (GN/OG), harness side.
      • sensor cluster C3073-3, circuit VCA23 (BU/WH), harness side.
      Fig 8: Checking Sensor Cluster CAN Circuits For Short To Ground
      G06063945Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
      • Yes  : GO to G11.
      • No  : REPAIR the affected circuit(s). CLEAR the DTC. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
  11. G11 CHECK THE SENSOR CLUSTER CAN CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between ground and:
      • sensor cluster C3073-2, circuit VCA24 (GN/OG), harness side.
      • sensor cluster C3073-3, circuit VCA23 (BU/WH), harness side.
      Fig 9: Checking Sensor Cluster CAN Circuit For Short To Voltage
      G06063946Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes  : REPAIR the affected circuit(s). CLEAR the DTCs. CARRY OUT the IVD Initialization sequence, FOLLOW the scan tool directions. REPEAT the self-test.
      • No  : GO to G12.
  12. G12 CHECK THE ABS MODULE YAW RATE VALUE (YAW_RATE) PID 
    • Connect: Sensor Cluster C3073.
    • Connect: ABS Module C155.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
    • Monitor the YAW_RATE PID.
      NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement will result in false values for this test.
    • Is the YAW_RATE PID value between -0.004 and 0.004? 
  13. G13 CHECK THE ABS MODULE LATERAL ACCELERATION (LAT_ACCL) PID 
    • Monitor the LAT_ACCL PID.
      NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement will result in false values for this test.
    • Is the LAT_ACCL PID value between -0.3 and 0.3? 
  14. G14 CHECK THE ABS MODULE CONNECTORS 
    • Ignition OFF.
    • Disconnect: ABS Module C155.
    • Check ABS module C155 for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: ABS Module C155.
    • Make sure the connector seats correctly, then 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 . TEST the system for normal operation.
      • 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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