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Home >> Ford >> 2007 >> Freestar SEL >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnostic Tests >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test H: DTC C1285 - Booster Solenoid Circuit Failure, DTC C1286 - Booster Mechanical Failure >> Pinpoint Test H: DTC C1285 - Booster Solenoid Circuit Failure

Pinpoint Test H: DTC C1285 - Booster Solenoid Circuit Failure

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
  1. H1 CARRY OUT THE RECALIBRATION PROCEDURE 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Clear the Diagnostic Trouble Codes (DTCs)
    • Carry out the ABS active brake booster recalibration procedure using the scan tool.
    • Test drive the vehicle.
    • Enter the following diagnostic mode on the diagnostic tool: Retrieve the DTCs
    • Are any ABS DTCs retrieved or does the recalibration procedure indicate a fault? 
    1. YES  : If DTC C1285 is retrieved, or the brake booster portion of the recalibration procedure indicates a failure, go to  H2 .

      If any other DTC is retrieved, go to the Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index.

    2. NO  : The ABS system is operating correctly.
  2. H2 CHECK THE BRAKE BOOSTER SOLENOID 
    • Key in OFF position.
    • Disconnect: Active Brake Booster C149
      • Fig 1: Checking Brake Booster Solenoid
      GF0033383Courtesy of FORD MOTOR CO.
    • Measure the resistance between active brake booster C149-3, circuit 1583 (BN/WH), component side and active brake booster C149-4, circuit 1582 (LG/RD), component side.
    • Is the resistance between 1 and 2 ohms? 
    1. YES  : Go to  H3.
    2. NO  : INSTALL a new active brake booster. REFER to POWER BRAKE ACTUATION article. CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. REPEAT the self-test.
  3. H3 CHECK CIRCUIT 1582 (LG/RD) AND CIRCUIT 1583 (BN/WH) FOR AN OPEN 
      Fig 2: Checking Circuit For Open
      GF0033384Courtesy of FORD MOTOR CO.
    • Measure the resistance between:
      • ABS module C155-15, circuit 1582 (LG/RD), harness side and active brake booster C149-4, circuit 1582 (LG/RD), harness side.
      • ABS module C155-29, circuit 1583 (BN/WH), harness side and active brake booster C149-3, circuit 1583 (BN/WH), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  H4.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. REPEAT the self-test.
  4. H4 CHECK CIRCUIT 1582 (LG/RD) AND CIRCUIT 1583 (BN/WH) FOR A SHORT TO GROUND 
      Fig 3: Checking Circuit For Short To Ground
      GF0033385Courtesy of FORD MOTOR CO.
    • Measure the resistance between ground and:
      • active brake booster C149-4, circuit 1582 (LG/RD), harness side.
      • active brake booster C149-3, circuit 1583 (BN/WH), harness side.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  H5.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. REPEAT the self-test.
  5. H5 CHECK CIRCUIT 1583 (BN/WH) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 4: Checking Circuit For Voltage
      GF0033386Courtesy of FORD MOTOR CO.
    • Measure the voltage between active brake booster C149-3, circuit 1583 (BN/WH), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR circuit 1583 (BN/WH). CLEAR the DTCs. RECALIBRATE the ABS module. FOLLOW the scan tool directions for the calibration procedure. REPEAT the self-test.
    2. NO  : Go to  H6.
  6. H6 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
      • Fig 5: Connecting Fused Jumper Wire
      GF0033387Courtesy of FORD MOTOR CO.
    • Connect a fused (10A) jumper wire between ABS module C155-29, circuit 1583 (BN/WH), harness side and ground.
      • Fig 6: Connecting Fused Jumper Wire
      GF0033388Courtesy 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.
    • Does the brake pedal move? 
    1. YES  : Go to  H7.
    2. NO  : INSTALL a new active brake booster. REFER to POWER BRAKE ACTUATION article. CLEAR the DTCs. RECALIBRATE the ABS module. REPEAT the self-test.
  7. H7 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect the ABS connector.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect the ABS connector and make sure it seats 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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