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Pinpoint Test K: DTC C1288 And C1440 (Abs With Stability Assist) - Brake Pressure Transducer Input Circuit Failure: Overview

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. 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 multimeter probes.
  1. K1 CHECK FOR DTCS 
    • Key in ON position.
    • Using the recorded results from the ABS module self-test:
    • Is DTC C1287, C1483, B2734, B2736, B2737, B2738, or B2740 present? 

    Yes 

    REPAIR these DTCs first. REFER to the appropriate pinpoint test for each DTC retrieved.

    No 

    GO to K2.

  2. K2 CHECK THE PRIMARY BRAKE PRESSURE TRANSDUCER CIRCUITRY FOR A SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: ABS Module C155.
    • Disconnect: Primary Brake Pressure Transducer C147.
    • Key in ON position.
    • Measure the voltage between the primary brake pressure transducer connector, harness side and ground as follows:
      CIRCUIT SPECIFICATION

      Primary Brake Pressure Transducer Connector- Pin Circuit
      C147-1 3603 (RD)
      C147-2 3600 (RD/WH)
      C147-3 3601 (WH/RD)
      Fig 1: Measuring Voltage Between Primary Brake Pressure Transducer Connector, Harness Side And Ground
      G03180334Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes 

    REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

    No 

    GO to K3.

  3. K3 CHECK THE PRIMARY BRAKE PRESSURE TRANSDUCER CIRCUITRY FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the primary brake pressure transducer connector, harness side and ground as follows:
      CIRCUIT SPECIFICATION

      Primary Brake Pressure Transducer Connector- Pin Circuit
      C147-1 3603 (RD)
      C147-2 3600 (RD/WH)
      C147-3 3601 (WH/RD)
      Fig 2: Measuring Resistance Between Primary Brake Pressure Transducer Connector, Harness Side And Ground
      G03180335Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes 

    GO to K4.

    No 

    REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

  4. K4 CHECK THE PRIMARY BRAKE PRESSURE TRANSDUCER CIRCUITRY FOR A SHORT 
    • Measure the resistance between the primary brake pressure transducer connector pins, harness side as follows:
      CIRCUIT SPECIFICATION

      Primary Brake Pressure Transducer Connector- Pin Circuit
      C147-1 3603 (RD)
      C147-2 3600 (RD/WH)
      C147-3 3601 (WH/RD)
      Fig 3: Measuring Resistance Between Primary Brake Pressure Transducer Connector Pins, Harness Side
      G03180336Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes 

    GO to K5.

    No 

    REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

  5. K5 CHECK THE PRIMARY BRAKE PRESSURE TRANSDUCER CIRCUITRY FOR AN OPEN 
    • Measure the resistance between the ABS module connector, harness side and the primary brake pressure transducer connector, harness side as follows:
      CIRCUIT SPECIFICATION

      ABS Module Connector-Pin Primary Brake Pressure Transducer Connector-Pin Circuit
      C155-19 C147-1 3603 (RD)
      C155-20 C147-2 3600 (RD/WH)
      C155-18 C147-3 3601 (WH/RD)
      Fig 4: Measuring Resistance Between ABS Module Connector, Harness Side
      G03180337Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes 

    GO to K6.

    No 

    REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

  6. K6 CHECK THE ABS MODULE OUTPUT 
    • Connect: ABS Module C155.
    • Key in ON position.
    • Measure the voltage between the primary brake pressure transducer C147-3, circuit 3601 (WH/RD), harness side, and the primary brake pressure transducer C147-1, circuit 3603 (RD), harness side.
      Fig 5: Measuring Voltage Between Primary Brake Pressure Transducer C147-3, Circuit 3601 (WH/RD)
      G03180338Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 

    Yes 

    GO to K7.

    No 

    GO to  K8.

  7. K7 CHECK THE PRIMARY BRAKE PRESSURE TRANSDUCER OUTPUT 
    • Connect: Primary Brake Pressure Transducer C147.
    • Disconnect: ABS Module C155.
    • Remove pin 20, circuit 3600 (RD/WH) from the ABS module connector.
    • Connect: ABS Module C155.
    • Key in ON position.
    • Measure the voltage between the ABS module C155-20, circuit 3600 (RD/WH), harness side and ground, while pressing and releasing the brake pedal.
    • Is the voltage between 0.35 and 0.65 volt with the brake pedal released and between 0.65 and 4.5 volts with the brake pedal pressed? 

    Yes 

    GO to K8.

    No 

    INSTALL a new primary brake pressure transducer. REFER to BRAKE PRESSURE TRANSDUCER . CLEAR the DTCs. RECALIBRATE the ABS module. REPEAT the self-test.

  8. K8 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all ABS connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all ABS connectors and make sure they seat 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 . TEST the system for normal operation.

    No 

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

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