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Home >> Ford >> 2004 >> Freestar Base >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Test >> Pinpoint Test I: DTC C1285 - Booster Solenoid Circuit Failure And DTC C1286 Booster Mechanical Failure >> Pinpoint Test I: DTC C1285 Booster Solenoid Circuit Failure And DTC C1286 Booster Mechanical Failure

Pinpoint Test I: DTC C1285 Booster Solenoid Circuit Failure And DTC C1286 Booster Mechanical Failure

  1. I1 CARRY OUT THE RECALIBRATION PROCEDURE 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Clear DTC.
    • Carry out the ABS active brake booster recalibration procedure using the diagnostic tool.
    • Test drive the vehicle.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve DTCs.
    • Are any ABS DTCs retrieved or does the recalibration procedure indicate a fault? 

    Yes 

    If DTC C1285 is retrieved, or the brake booster portion of the recalibration procedure indicates a failure, GO to I2.

    If DTC C1286 is retrieved, or the brake booster portion of the recalibration procedure indicates a failure, GO to I6.

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

    No 

    The ABS system is operating correctly.

  2. I2 CHECK THE BRAKE BOOSTER SOLENOID 
    • Key in OFF position.
    • Disconnect: Active Brake Booster C149.
    • Measure the resistance between the active brake booster C149-3, circuit 1583 (BN/WH), component side and the active brake booster C149-4, circuit 1582 (LG/RD), component side.
      Fig 1: Checking Brake Booster Solenoid
      G03826491Courtesy of FORD MOTOR CO.
    • Is the resistance between 1 and 2 ohms? 

    Yes 

    GO to I3.

    No 

    INSTALL a new active brake booster. REFER to BRAKE SYSTEM . CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the diagnostic tool directions for the calibration procedure. REPEAT the self-test.

  3. I3 CHECK CIRCUIT 1582 (LG/RD) AND CIRCUIT 1583 (BN/WH) FOR AN OPEN 
    • Disconnect: ABS Module C155.
    • Measure the resistance between the ABS module C155-15, circuit 1582 (LG/RD), harness side and the active brake booster C149-4, circuit 1582 (LG/RD), harness side; and between the ABS module C155-29, circuit 1583 (BN/WH), harness side and the active brake booster C149-3, circuit 1583 (BN/WH), harness side.
      Fig 2: Checking Circuit 1582 And Circuit 1583 For Open
      G03826492Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes 

    GO to I4.

    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.

  4. I4 CHECK CIRCUIT 1582 (LG/RD) AND 1583 (BN/WH) FOR A SHORT TO GROUND 
    • Measure the resistance between the active brake booster C149-4, circuit 1582 (LG/RD), harness side and ground; and between the active brake booster C149-3, circuit 1583 (BN/WH), harness side and ground.
      Fig 3: Checking Circuit 1582 And 1583 For Short To Ground
      G03826493Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes 

    GO to I5.

    No 

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

  5. I5 CHECK CIRCUIT 1583 (BN/WH) FOR A SHORT TO POWER 
    • Key in ON position.
    • Measure the voltage between the active brake booster C149-3 circuit 1583 (BN/WH), harness side and ground.
      Fig 4: Checking Circuit 1583 For Short To Power
      G03826494Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes 

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

    No 

    GO to I6.

  6. I6 CHECK THE ACTIVE BRAKE BOOSTER SOLENOID FOR CORRECT OPERATION 
    • Connect: Active Brake Booster C149.
    • Connect: ABS Module C155.
    • Start the engine and wait a few minutes to create vacuum in the brake booster and then place the ignition switch in the OFF position.
    • Disconnect: ABS Module C155.
    • Connect a fused (10A) jumper wire between the ABS module C155-29, circuit 1583 (BN/WH), harness side and ground.
      Fig 5: Checking Active Brake Booster Solenoid For Correct Operation (1 Of 2)
      G03826495Courtesy of FORD MOTOR CO.
    • Connect a fused (10A) jumper wire for several seconds between the ABS module C155-15, circuit 1582 (LG/RD), harness side and the positive battery post, while observing the brake pedal for movement.
      Fig 6: Checking Active Brake Booster Solenoid For Correct Operation (2 Of 2)
      G03826496Courtesy of FORD MOTOR CO.
    • Does the brake pedal move? 

    Yes 

    GO to I7.

    No 

    INSTALL a new active brake booster. REFER to BRAKE SYSTEM . CLEAR the DTCs. RECALIBRATE the ABS module. REPEAT the self-test.

  7. I7 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all the ABS connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the 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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