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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Engine Controls - Pinpoint Tests - 6.0L (99P F450/550) Diesel) >> Pinpoint Test AI: Brake Pedal Position (BPP) Switch >> Test Procedure

Test Procedure

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  1. AI1 DIAGNOSTIC TROUBLE CODE (DTC) P1703 
    NOTE: DTC P1703 indicates that during the key on engine running (KOER) self-test, the BPP signal did not cycle.
    • Possible causes:
      • Brake pedal not applied and released during KOER self-test
      • BPP switch
      • BPP switch signal circuit open
      • BPP switch signal short to voltage
    • Key ON, engine OFF.
    • Access the PCM and monitor the BPP PID.

    Does the BPP PID indicate ON? 

    Yes No
    GO to  AI2. GO to  AI4.
  2. AI2 CHECK THE BPP SWITCH 
    • Key in OFF position.
    • BPP Switch connector disconnected.
    • Key ON, engine OFF.
    • Access the PCM and monitor the BPP PID.

    Does the BPP PID indicate ON? 

    Yes No
    GO to  AI3. INSTALL a new BPP switch. CLEAR the DTCs.
    REPEAT the self-test.
  3. AI3 CHECK THE BPP SWITCH SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) BPP Switch Connector, Harness Side ( - )
      BPP Ground

    Is any voltage indicated? 

    Yes No
    REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.    		 GO to  AI8.
  4. AI4 CHECK THE BPP SWITCH OPERATION 
    • Access the PCM and monitor the BPP PID.
    • Apply and release the brake pedal.

    Does the BPP PID state change when the brake pedal is fully applied and released? 

    Yes No
    UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to SYMPTOM CHARTS , if a driveability concern exists. GO to  AI5.
  5. AI5 CHECK THE BPP SWITCH FOR VOLTAGE 
    • Key in OFF position.
    • BPP Switch connector disconnected.
    • Measure the voltage between:
      ( + ) BPP Switch Connector, Harness Side ( - )
      B+ Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  AI6. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  6. AI6 CHECK THE BPP SWITCH SIGNAL 
    • Key ON, engine OFF.
    • Access the PCM and monitor the BPP PID.
    • Connect a 5 amp fused jumper wire between the following:
      Point A BPP Switch Connector, Harness Side Point B BPP Switch Connector, Harness Side
      B+ BPP

    Does the BPP PID indicate ON? 

    Yes No
    INSTALL a new BPP switch. CLEAR the DTCs.
    REPEAT the self-test.    		 GO to  AI7.
  7. AI7 CHECK THE BPP SWITCH INPUT CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) BPP Switch Connector, Harness Side ( - ) PCM Connector, Harness Side
      BPP BPP - Pin B18

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  AI8. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  8. AI8 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) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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