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P0504, P0572, P0573 Or P1703

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. D1 CHECK THE OPERATION OF THE STOPLAMPS 
    • Ignition ON.
    • Operate the stoplamps.

    Do the stoplamps and high mounted stoplamp operate correctly? 

    1. Yes  : GO to D2 
    2. No  : REFER to: STOPLAMPS .
  2. D2 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 BOO1 (stoplamp switch) and BOO2 (cruise control deactivator switch) Parameter Identifications (PIDs) 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? 

    1. Yes  : GO to  D8
    2. No  : For an incorrect BOO1 PID  value, GO to D3 

      For an incorrect BOO2 PID  value, GO to  D4

  3. D3 CHECK THE STOPLAMP SWITCH CIRCUIT 
    • Ignition OFF.
    • Disconnect: PCM C1232B  (1.6L GTDI), C1551B  (2.5L iVCT), C1381B  (2.0L GTDI) or C175B  (2.0L Hybrid).
    • Ignition ON.
    • While applying the brake pedal, measure:
      CONNECTORS MEASUREMENT - 1.6L GTDI

      Positive Lead Measurement/Action Negative Lead
      C1232B-65  VOLTAGE Ground
      CONNECTORS MEASUREMENT - 2.0L GTDI

      Positive Lead Measurement/Action Negative Lead
      C1381B-65  VOLTAGE Ground
      CONNECTORS MEASUREMENT - 2.5L IVCT

      Positive Lead Measurement/Action Negative Lead
      C1551B-46  VOLTAGE Ground
      CONNECTORS MEASUREMENT - 2.0L HYBRID

      Positive Lead Measurement/Action Negative Lead
      C175B-3  VOLTAGE Ground

    Is the voltage greater than 11 volts? 

    1. Yes  : GO to  D8
    2. No  : REPAIR the circuit.
  4. D4 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH FOR CORRECT OPERATION 
    • Ignition OFF.
    • Disconnect: PCM C1232B  (1.6L GTDI), C1551B  (2.5L iVCT), C1381B  (2.0L GTDI) or C175B  (2.0L Hybrid).
    • While firmly applying and releasing the brake pedal, measure:
      CONNECTORS MEASUREMENT - 1.6L GTDI

      Positive Lead Measurement/Action Negative Lead
      C1232B-66  OHM Ground
      CONNECTORS MEASUREMENT - 2.0L GTDI

      Positive Lead Measurement/Action Negative Lead
      C1381B-66  OHM Ground
      CONNECTORS MEASUREMENT - 2.5L IVCT

      Positive Lead Measurement/Action Negative Lead
      C1551B-13  OHM Ground
      CONNECTORS MEASUREMENT - 2.0L HYBRID

      Positive Lead Measurement/Action Negative Lead
      C175B-2  OHM 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? 

    1. Yes  : GO to  D8
    2. No  : GO to D5 
  5. D5 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Disconnect: BPP  Switch C278  .
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C278-3  OHM Ground

    Is the resistance less than 3 ohms? 

    1. Yes  : GO to D6 
    2. No  : REPAIR the circuit.
  6. D6 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    • Measure:
      Positive Lead Measurement/Action Negative Lead
      C278-1  OHM Ground

    Is the resistance greater than 10, 000 ohms? 

    1. Yes  : GO to D7 
    2. No  : REPAIR the circuit.
  7. D7 CHECK THE CRUISE CONTROL DEACTIVATOR SWITCH SIGNAL CIRCUIT FOR AN OPEN 
    • Connect:
      Positive Lead Measurement/Action Negative Lead
      C278-2  FUSED JUMPER WIRE C278-4 
    • Measure:
      CONNECTORS MEASUREMENT - 1.6L GTDI

      Positive Lead Measurement/Action Negative Lead
      C1232B-65  OHM Ground
      CONNECTORS MEASUREMENT - 2.0L GTDI

      Positive Lead Measurement/Action Negative Lead
      C1381B-65  OHM Ground
      CONNECTORS MEASUREMENT - 2.5L IVCT

      Positive Lead Measurement/Action Negative Lead
      C1551B-46  OHM Ground
      CONNECTORS MEASUREMENT - 2.0L HYBRID

      Positive Lead Measurement/Action Negative Lead
      C175B-3  OHM Ground

    Is the resistance less than 3 ohms? 

    1. Yes  : INSTALL a new BPP  switch.

      REFER to: STOPLAMP SWITCH .

    2. No  : REPAIR the signal circuit for an open.
  8. D8 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? 

    1. 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 the appropriate Engine Mechanical article for the procedure.

    2. 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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