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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 204 (Engine Controls - Pinpoint Tests - 6.0L Diesel (99P F450/550)) >> Pinpoint Test I: Parking Brake Applied (PBA) Switch >> Test Procedure

Test Procedure

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  1. I1 DIAGNOSTIC TROUBLE CODE (DTC) P1536 
    NOTE: When performing the key on engine running (KOER) self-test, wait 5 seconds after beginning the test before operating the parking brake.
    • Possible causes:
      • parking brake not applied and released during KOER self-test
      • PBA switch
      • parking brake signal circuit short to ground
      • parking brake signal circuit open
    • Key ON, engine OFF.
    • Access the PBA PID.
    • Apply and release the parking brake.

    Does the PBA PID indicate OFF with the parking brake released and ON with the parking brake applied? 

    Yes No
    UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the fault. REPAIR as necessary. REFER to SYMPTOM CHARTS - 6.0L DIESEL if a driveability concern exists. If the PBA PID indicates ON, GO to  I2.
    If the PBA PID indicates OFF, GO to  I4.
  2. I2 CHECK THE PBA SWITCH 
    • Key OFF.
    • Disconnect the PBA switch.
    • Key ON, engine OFF.
    • Access the PBA PID.

    Does PID indicate OFF? 

    Yes No
    INSTALL a new PBA switch. CLEAR the DTCs. REPEAT the self-test. GO to  I3.
  3. I3 CHECK THE PARKING BRAKE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Key OFF.
    • Disconnect the PCM body harness connector.
    • Measure the resistance between the PCM body connector pin 17, harness side and ground.

    Is the resistance greater than 10,000 ohms? 

    Yes No
    INSTALL a new PCM. CLEAR the DTCs. REPEAT the self-test. REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. I4 CHECK THE PARKING BRAKE SIGNAL CIRCUIT VOLTAGE 
    • Key OFF.
    • Disconnect the PBA switch.
    • Key ON, engine OFF.
    • Measure the voltage between the PBA switch signal circuit pin 1, harness side and ground.

    Is the voltage greater than 10 volts? 

    Yes No
    GO to  I6. GO to  I5.
  5. I5 CHECK THE PARKING BRAKE CIRCUIT FOR AN OPEN 
    • Key OFF.
    • Disconnect the PCM body harness connector.
    • Measure the resistance between the PBA switch signal circuit pin 1, harness side and the PCM body connector pin 17, harness side.

    Is the resistance less than 5 ohms? 

    Yes No
    INSTALL a new PCM. CLEAR the DTCs. REPEAT the self-test. REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. I6 CHECK THE PARKING BRAKE GROUND CIRCUIT FOR AN OPEN 
    • Key OFF.
    • Measure the resistance between the PBA switch ground circuit pin 2, harness side and ground.

    Is the resistance less than 5 ohms? 

    Yes No
    INSTALL a new PBA switch. CLEAR the DTCs. REPEAT the self-test. REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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