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Test Procedure

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. FD1 DIAGNOSTIC TROUBLE CODES (DTC)S P1572 AND P1703: CHECK FOR DTCS 
    • Are continuous DTCs P1572 or P1703 present? 
    Yes No
    For KOEO and continuous memory DTCs P1572 and P1703, GO to  FD3.
    For KOER DTC P1703, GO to  FD2.    		 RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.
  2. FD2 KOER DTC 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.
  3. FD3 DTCS P1572 AND P1703: CHECK THE OPERATION OF THE STOPLAMPS 
    • Key ON, engine OFF.
    • Apply and release the brake pedal and check the stoplamp operation.
    • Do the stoplamps operate correctly? 
    Yes No
    GO to  FD4. REFER to EXTERIOR LIGHTING to diagnose the inoperative stoplamps.
  4. FD4 CHECK SPEED CONTROL OPERATION 
    • Check for correct speed control operation.
    • Does speed control operate correctly? 
    Yes No
    GO to  FD5. REFER to SPEED CONTROL to diagnose the speed control system.
  5. FD5 CHECK FOR BPP CIRCUIT CYCLING 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Apply and release the brake pedal while monitoring the voltage.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - )
      BPP - Pin B8 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
    GO to  FD6. REPAIR the open circuit.
  6. FD6 CHECK FOR BPS CIRCUIT CYCLING 
    • Apply and release the brake pedal while monitoring the voltage.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - )
      BPS - Pin B20 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
    Key in OFF position.
    GO to  FD8.    		 GO to  FD7.
  7. FD7 CHECK THE BPS CIRCUIT VOLTAGE 
    NOTE: The brake pedal should be in the released position.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - )
      BPS - Pin B20 Ground
    • Is the voltage greater than 10 V? 
    Yes No
    Key in OFF position. REPAIR the short circuit. Key in OFF position. REPAIR the open circuit.
  8. FD8 BPP AND BPS RATIONALITY CHECK 
    • PCM connector connected.
    • Clear all continuous memory DTCs.
    • Key ON, engine running.
    • Apply and release the brake pedal several times.
    • Retrieve all continuous memory DTCs from the PCM.
    • Is DTC P1572 present? 
    Yes No
    REFER to EXTERIOR LIGHTING to check for correct BPP and BPS switch installation. If OK,
    GO to  FD10.    		 GO to  FD9.
  9. FD9 CHECK PCM FOR REOCCURRING BPP DTCS 
    • Carry out the PCM KOER self-test.
    • Is DTC P1703 present? 
    Yes No
    GO to  FD10. Unable to duplicate or identify the concern at this time.
  10. FD10 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 toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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