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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Anti-Lock Brake System And Stability Control -- F250-F550 Super Duty) >> Diagnosis And Testing >> Anti-Lock Control - Three-Channel >> Pinpoint Tests >> Pinpoint Test F: DTC C1288, C1730 or C2778 >> PINPOINT TEST F: DTCs C1288, C1730 OR C2778

PINPOINT TEST F: DTCs C1288, C1730 OR C2778

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. F1 CHECK FOR ABS MODULE ON-DEMAND DTCs 
    • Ignition ON.
    • Using the scan tool, clear the DTCs.
    • Ignition OFF.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
    • Retrieve and record the DTCs.
    • Did DTCs C1288, C1730 or C2778 return? 
      1. Yes  : GO to F2.
      2. No  : If other DTCs are retrieved, REFER to the ABS Module DTC Chart - Three-Channel . If no DTCs are retrieved, the concern may have been caused by a loose connection. TEST the system for normal operation.
  2. F2 CHECK THE ABS MODULE OUTPUT TO THE BRAKE PRESSURE TRANSDUCER 
    • Ignition OFF.
    • Disconnect: Brake Pressure Transducer C1025.
    • Ignition ON.
    • Measure the voltage between brake pressure transducer C1025-3, circuit LCA16 (GN), harness side and brake pressure transducer C1025-1, circuit RCA16 (BU/BN) harness side.
      Fig 1: Measuring Voltage Between Brake Pressure Transducer C1025-3 And Brake Pressure Transducer C1025-1
      G06457096Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.75 and 5.25 volts? 
      1. Yes  : The concern may have been caused by a loose connection. TEST the system for normal operation.
      2. No  : If the voltage is greater than 5.25 volts, GO to F3.

        If the voltage is less than 4.75 volts, GO to  F4.

  3. F3 CHECK THE BRAKE PRESSURE TRANSDUCER SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: ABS Module C135.
    • Ignition ON.
    • Measure the voltage between brake pressure transducer C1025-3, circuit LCA16 (GN), harness side and ground.
      Fig 2: Measuring Voltage Between Brake Pressure Transducer C1025-3, Circuit LCA16 (GN), Harness Side And Ground
      G06762799Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      1. Yes  : GO to  F7.
      2. No  : GO to  F8.
  4. F4 CHECK THE BRAKE PRESSURE TRANSDUCER SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: ABS Module C135.
    • Measure the resistance between ABS module C135-29, circuit LCA16 (GN), harness side and ground.
      Fig 3: Measuring Resistance Between ABS Module C135-29, Circuit LCA16 (GN), Harness Side And Ground
      G07479153Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
      1. Yes  : GO to F5.
      2. No  : REPAIR circuit LCA16 (GN). CLEAR the DTCs. REPEAT the self-test.
  5. F5 CHECK THE BRAKE PRESSURE TRANSDUCER SUPPLY CIRCUIT FOR AN OPEN 
    • Measure the resistance between ABS module C135-29, circuit LCA16 (GN), harness side and brake pressure transducer C1025-3, circuit LCA16 (GN), harness side.
      Fig 4: Measuring Resistance Between ABS Module C135-29, Circuit LCA16 (GN) And Brake Pressure Transducer C1025-3, Circuit LCA16 (GN)
      G07479154Courtesy of FORD MOTOR CO.
    • Is the resistances less than 5 ohms? 
      1. Yes  : GO to F6.
      2. No  : REPAIR circuit LCA16 (GN) for an open circuit. CLEAR the DTCs. REPEAT the self-test.
  6. F6 CHECK THE BRAKE PRESSURE TRANSDUCER SENSE CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: Trailer Brake Control (TBC) Module C1025.
    • Measure the resistance between TBC module C135-33, circuit VCA13 (YE/BU), harness side and brake pressure transducer C151-2, circuit VCA13 (YE/BU), harness side.
      Fig 5: Measuring Resistance Between TBC Module C135-33, Circuit VCA13 (YE/BU) And Brake Pressure Transducer C151-2, Circuit VCA13 (YE/BU)
      G07479155Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      1. Yes  : GO to F7.
      2. No  : REPAIR circuit VCA13 (YE/BU). CLEAR the DTCs. REPEAT the self-test.
  7. F7 CHECK THE BRAKE PRESSURE TRANSDUCER FOR A SHORT 
    • Measure the resistance between brake pressure transducer C1025, pin 1, component side and brake pressure transducer C1025, pin 3, component side while firmly pressing and holding the brake pedal.
    • Is the resistance less than 5 ohms? 
      1. Yes  : INSTALL a new pressure transducer. CLEAR the DTCs. REPEAT the self-test.
      2. No  : GO to F8.
  8. F8 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect: ABS Module C135.
    • Check the ABS module connector for:
      • corrosion
      • pushed-out pins
      • spread terminals
    • Connect the ABS module connector and make sure that it is seated correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
      1. Yes  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.
      2. 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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