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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Engine Controls - Self-Diagnostics - 6.0L (99P F450/550) Diesel) >> System Tests >> Test I: Parking Brake Applied Switch >> Testing

Test I: Parking Brake Applied Switch: Testing

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: The Powertrain Control Module (PCM) harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no-start condition. Installing PCM connectors on an angle may cause a bad connection, misdiagnosis and damaged components. Install the connector on where the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM lever to fully seat the connector.
NOTE: When the PCM engine harness connector is disconnected additional DTCs will be set. All DTCs must be cleared before returning the vehicle to service.

  1. 1) DTC P1536

    Possible causes are:
    • Low brake fluid.
    • Short to ground.
    • Open circuit.

    Confirm BRAKE WARNING light is working during engine start mode (bulb check). Is bulb working? If yes, go to next step. If no, see appropriate ANALOG INSTRUMENT PANEL article in ACCESSORIES & EQUIPMENT to repair BRAKE WARNING light.

  2. 2) Check For Park Brake Switch Operation

    Connect scan tool. Key on. Access PBA PID. Cycle parking brake on/off. Does PID transition on/off when parking brake is cycled? If yes, unable to duplicate condition. Check for loose connections, damaged or corroded pins. Wiggle harness attempting to recreate fault. If no, go to next step.

  3. 3) Check PBA Switch

    Parking brake fully up (OFF position). Disconnect PBA switch. Does PID read OFF? If yes, go to next step. If no, go to step  6).

  4. 4) Check Parking Brake Circuit

    Install a jumper wire between PBA electrical connector and ground. Does PID transition to ON? If yes, install a new parking brake switch. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

  5. 5) Check Parking Brake Circuit For An Open

    Key off. Disconnect the PCM body harness connector C1381A. Measure the resistance between the PCM body harness connector C1381A terminal No. 17 and PBA switch electrical connector. See CONTROL MODULE CONNECTOR IDENTIFICATION . Is the resistance less than 0.5 ohm? If yes, install a new PCM. Restore the vehicle. Clear DTCs and retest the system. If no, repair open circuit. Restore the vehicle. Clear DTCs and retest the system.

  6. 6) Check Parking Brake Circuit For A Short To Ground

    Key off. Disconnect the PCM body harness connector. Measure the resistance between the PCM body harness connector C1381A terminal No. 17 and ground. See CONTROL MODULE CONNECTOR IDENTIFICATION . Is the resistance greater than 10,000 ohms? If yes, go to next step. If no, repair short to ground. Restore the vehicle. Clear DTCs and retest the system.

  7. 7) Check Parking Brake Circuitry

    Reconnect the PCM body harness connector C1381A. Key on. Measure the voltage between PBA electrical connector and ground. Is the voltage greater than 10.0 volts? If yes, install a new PBA switch. Restore the vehicle. Clear DTCs and retest the system. If no, install a new PCM. Restore the vehicle. Clear DTCs and retest the system.
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