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Pinpoint Test C: P0504:00, P0572:00, P0573:00, 1703:00 Or P1935:00

  1. Refer to Cruise Control for schematic and connector information.

    Normal Operation and Fault Conditions 

    REFER to: Cruise Control - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0504:00 Brake Switch "A"/"B" Correlation: No Sub Type Information This DTC sets when the PCM does not sense the correct sequence of the brake pedal input signal from both the cruise control deactivator and stoplamp switches when the brake pedal is pressed and released.
    PCM P0572:00 Brake Switch "A" Circuit Low: No Sub Type Information This DTC sets when the PCM detects an open in the stoplamp switch signal. The PCM monitors the vehicle speed, engine speed, engine torque and stoplamp inputs during start and stop driving cycles. If the stoplamp switch input to the PCM is always off during start and stop driving cycles, this DTC sets in continuous memory.
    PCM P0573:00 Brake Switch "A" Circuit High: No Sub Type Information This DTC sets when the PCM detects a short to voltage on the stoplamp switch signal. The PCM monitors the vehicle speed, engine speed, engine torque and the stoplamp switch inputs during start and stop driving cycles. If the stoplamp lamp switch input to the PCM is always on during start and stop driving cycles, this DTC sets in continuous memory.
    PCM P1703:00 Brake Switch Out Of Self Test Range: No Sub Type Information This DTC sets in the PCM during the self-test when the stoplamp switch input signal is high or does not cycle high and low.
    PCM P1935:00 Brake Switch/Sensor Signal: No Sub Type Information This DTC sets in the PCM when the PCM does not receive the brake switch input to deactivate the cruise control.

    Possible Sources 

    • Wiring, terminals or connectors
    • Stoplamp switch
    • PCM

  2. NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

  3. C1 CHECK THE OPERATION OF THE STOPLAMPS

    • Ignition ON.

    • Operate the stoplamps.

    Do the stoplamps and high mounted stoplamp operate correctly? 

    Yes  GO to  C2
    No  REFER to: Stoplamps .

  4. C2 CHECK THE STOPLAMP SWITCH (BOO1) AND CRUISE CONTROL DEACTIVATOR SWITCH (BOO2) PARAMETER IDENTIFICATIONS (PIDS)

    • Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

    • Using the table, monitor the Parameter Identifications (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 firmly On On

    Do the PID values agree with the brake pedal position? 

    Yes  GO to  C8
    No  For an incorrect BOO1 PID value, GO to  C3 For an incorrect BOO2 PID value, GO to  C4

  5. C3 CHECK THE STOPLAMP SWITCH CIRCUIT

    • Ignition OFF.

    • Disconnect PCM C1381B 2.0L EcoBoost.

    • Disconnect PCM C175B 2.7L EcoBlue.

    • Disconnect PCM C1551B 2.7L EcoBoost.

    • Ignition ON.

    • While applying and releasing the brake pedal, measure:

      2.0L EcoBoost 

      Positive Lead Measurement / Action Negative Lead
      C1381B-10
      GFD528723Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.0L EcoBlue 

      Positive Lead Measurement / Action Negative Lead
      C175B-39
      GFD528723Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.7L EcoBoost 

      Positive Lead Measurement / Action Negative Lead
      C1551B-8
      GFD528723Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts with the brake pedal applied and no voltage with the brake pedal released? 

    Yes  GO to  C8
    No  REPAIR the circuit.

  6. C4 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION

    • Ignition OFF.

    • Disconnect PCM C1381B 2.0L EcoBoost.

    • Disconnect PCM C175B 2.7L EcoBlue.

    • Disconnect PCM C1551B 2.7L EcoBoost.

    • While firmly applying and releasing the brake pedal, measure:

      2.0L EcoBoost 

      Positive Lead Measurement / Action Negative Lead
      C1381B-11
      GFD528722Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.0L EcoBlue 

      Positive Lead Measurement / Action Negative Lead
      C175B-64
      GFD528722Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.7L EcoBoost 

      Positive Lead Measurement / Action Negative Lead
      C1551B-23
      GFD528722Courtesy 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  C8
    No  GO to  C5

  7. C5 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH GROUND CIRCUIT FOR AN OPEN

    • Disconnect BPP switch C278.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C278-3
      GFD528722Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  C6
    No  REPAIR the circuit.

  8. C6 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C278-2
      GFD528722Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  C7
    No  REPAIR the circuit.

  9. C7 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR AN OPEN

    • Connect a fused jumper wire:
      Positive Lead Measurement / Action Negative Lead
      C278-2
      GFD528724Courtesy of FORD MOTOR COMPANY
      		 C278-3

    • Measure:

      2.0L EcoBoost 

      Positive Lead Measurement / Action Negative Lead
      C1381B-11
      GFD528722Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.7L EcoBoost 

      Positive Lead Measurement / Action Negative Lead
      C1551B-23
      GFD528722Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new BPP switch. REFER to: Stoplamp Switch .
    No  REPAIR the signal circuit for an open.

  10. C8 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PCM connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent 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 service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to PCM Guided Routine Testing .
    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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