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PINPOINT TEST B : P0504, P0572, P0573, Or P1703

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. B1 CHECK THE OPERATION OF THE STOPLAMPS

    • Ignition ON.
    • Operate the stoplamps.

    Do the stoplamps and high mounted stoplamp operate correctly? 

    Yes  GO to  B2.
    No  Refer to Exterior Lighting , Stoplamps.

  2. B2 CHECK THE STOPLAMP SWITCH (BOO1) AND CRUISE CONTROL DEACTIVATOR SWITCH (BOO2) PIDs

    • Using a scan tool, view PCM PIDs.
    • Monitor the PCM PIDs BOO1 (stoplamp switch) and BOO2 (cruise control deactivator switch) while applying and releasing the brake pedal.
      Brake Pedal Position BOO1 PID BOO2 PID
      Released Off Off
      Applied lightly On Off
      Applied firmly On On

    Do the PID values agree with the brake pedal position? 

    Yes  GO to  B8.
    No  For an incorrect BOO1 PID value, GO to  B3.For an incorrect BOO2 PID value, GO to  B4.

  3. B3 CHECK THE STOPLAMP SWITCH CIRCUIT

    • Ignition OFF.
    • Disconnect: PCM C175B .
    • Ignition ON.
    • While applying the brake pedal, measure:
      Positive Lead Measurement / Action Negative Lead
      C175B-66
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts with the brake pedal applied? 

    Yes  GO to  B8.
    No  REPAIR the circuit.

  4. B4 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION

    • Ignition OFF.
    • Disconnect: PCM C175B .
    • While firmly applying and releasing the brake pedal, measure:
      Positive Lead Measurement / Action Negative Lead
      C175B-65
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms with the brake pedal released, and greater than 10, 000 ohms with the brake pedal firmly applied? 

    Yes  GO to  B8.
    No  GO to  B5.

  5. B5 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH GROUND CIRCUIT FOR AN OPEN

    • Disconnect: Stoplamp Switch C278 .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C278-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  B6.
    No  REPAIR the circuit.

  6. B6 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C278-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  B7.
    No  REPAIR the circuit.

  7. B7 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR AN OPEN

    • Connect a fused jumper wire:
      Positive Lead Measurement / Action Negative Lead
      C278-3
      GFD135987Courtesy of FORD MOTOR COMPANY
      		 C278-2
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C175B-65
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new stoplamp switch. REFER to Exterior Lighting .
    No  REPAIR the circuit.

  8. B8 CHECK FOR CORRECT PCM OPERATION

    • Disconnect and inspect all the PCM connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Reconnect the PCM connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new PCM. REFER to Electronic Engine Controls .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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