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Test Procedure

  1. FD1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTC) 

    Are DTCs P0504, P0572, P0573, P0703, P1572 or P1703 present? 

    Yes No
    For KOEO or continuous memory DTCs P0504, P0572, P0573, P0703, P1703 and continuous memory DTC P1572, GO to  FD3.
    For KOER DTCs P0703, or P1703, GO to  FD2.    		 For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. FD2 KOER DTCS P0703 AND P1703: VERIFY THE BRAKE PEDAL WAS APPLIED 

    Was the brake pedal applied and released during the KOER self-test? 

    Yes No
    GO to  FD3. REPEAT the KOER self-test. APPLY and RELEASE the brake pedal during the KOER test.
    CLEAR the DTCs. REPEAT the self-test.
  3. FD3 DTCS P0572, P0573, P0703, P1572 AND P1703: CHECK THE OPERATION OF THE STOPLAMPS 
    • Ignition ON, engine OFF.
    • Apply and release the brake pedal and check the stop lamp operation.

    Do the stoplamps operate correctly? 

    Yes No
    For Crown Victoria,
    Flex,
    Grand Marquis,
    MKS,
    MKT,
    Taurus, and
    Town Car, GO to  FD4.
    For all others, GO to  FD5.    		 REFER to the appropriate Exterior Lighting article to DIAGNOSE all the stoplamps are inoperative. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
  4. FD4 CHECK THE BRAKE SWITCH OPERATION 
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the BOO PID.
    • Apply and release the brake pedal while monitoring the brake position PID.

    Does the PID cycle ON and OFF? 

    Yes No
    GO to  FD6. REFER to the appropriate Module Communications Network article to DIAGNOSE the powertrain control module (PCM) not responding to the scan tool. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
  5. FD5 CHECK FOR BPP CIRCUIT CYCLING 
    • Ignition OFF.
    • PCM connector disconnected.
    • Ignition ON, engine OFF.
    • Apply and release the brake pedal while monitoring the voltage.
    • Measure the voltage between:
      (+) PCM Connector, Harness Side (-)
      BPP Ground

    Is voltage less than 1 volt with the brake pedal released and greater than 10 volts with the brake pedal fully applied? 

    Yes No
    For Ranger, GO to  FD7.
    For all others, GO to  FD6.    		 REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.
  6. FD6 CHECK FOR BRAKE PRESSURE SWITCH CIRCUIT CYCLING 
    • Ignition OFF.
    • PCM connector disconnected.
    • Ignition ON, engine OFF.
    • Apply and release the brake pedal while monitoring the voltage.
    • Measure the voltage between:
      (+) PCM Connector, Harness Side (-)
      BPS Ground

    Is voltage greater than 10 volts with the brake pedal released and less than 1 volt with the brake pedal fully applied? 

    Yes No
    GO to  FD7. REFER to the appropriate Cruise Control article . CARRY OUT the diagnostic steps for DTC P1703 to continue diagnose.
  7. FD7 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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