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Inspection and Verification

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern.
  2. Visually inspect the following for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Throttle body
    • Battery junction box (BJB) fuse 44 (15A)
    • Circuitry
    • Speed control switch
    • Clutch pedal speed control deactivator switch (manual transaxle)
    • Speed control deactivator switch (part of the stoplamp switch)
    • Stoplamp switch
    • Powertrain control module (PCM)
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  4. Verify the speedometer operates correctly without speed control by test driving the vehicle. If the speedometer does not operate correctly, refer to INSTRUMENT CLUSTER .
  5. Verify the stoplamps operate correctly with the ignition switch in the ON position. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING .
  6. Verify the parking brake warning indicator is operating correctly. If the parking brake warning indicator does not operate correctly, refer to INSTRUMENT CLUSTER .
  7. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • Check that the program card is correctly installed.
    • Check the connections to the vehicle.
    • Check the ignition switch position.
  8. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  9. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • CAN circuits fault; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
    • No response/not equipped for PCM, refer to MODULE COMMUNICATIONS NETWORK .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the PCM.
  10. If the DTCs retrieved are related to the concern, go to the POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
  11. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTCs Description Source Action
P0500 Vehicle Speed Error PCM REFER to the INTRODUCTION - GASOLINE article.
P0579 Cruise Control Multifunction Input A Circuit Range/Performance PCM GO to PINPOINT TEST C .
P0581 Cruise Control Multifunction Circuit High PCM GO to PINPOINT TEST C .
PO833 Clutch Pedal Switch B Circuit PCM GO to PINPOINT TEST D .
P1572 Brake Pedal Switch Circuit PCM GO to PINPOINT TEST B .
P1703 Brake Switch Out of Self-Test Range PCM GO to PINPOINT TEST B .
All other DTCs - PCM REFER to the INTRODUCTION - GASOLINE article to continue diagnosis.
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