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Inspection and Verification

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. Verify the customer concern.
  2. Visually inspect the following for obvious signs of electrical damage.
    VISUAL INSPECTION CHART

    Electrical
    • Smart junction box (SJB) fuse 6 (15A)
    • Circuitry
    • Powertrain control module (PCM)
    • Steering wheel switches
    • Stoplamp switch
    • Speed control deactivator switch
  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. NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
    5. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
  5. If the scan tool does not communicate with the VCM:
    • Check the VCM connection to the vehicle.
    • Check the scan tool connection to the VCM.
    • Refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
  6. If the scan tool does not communicate with the vehicle:
    • Verify the ignition key is in the ON position.
    • Verify the scan tool operation with a known good vehicle.
    • Refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the powertrain control module (PCM).
  7. Carry out the network test:
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
    • If the network test passes, retrieve and record the continuous memory DTCs.
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB.
  9. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  10. If no DTCs related to the concern are retrieved, go to Symptom Chart .
NOTE: DTC P0703 and DTC P1572 must be repaired before any other DTC.
POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC Description Action
P0500 Vehicle Speed Error REFER to INTRODUCTION -- HYBRID ENGINES article to diagnose the vehicle speed signal.
P0579 Cruise Control Multifunction Input A Circuit Range/Performance Go to Pinpoint Test J .
P0581 Cruise Control Multifunction Circuit High Go to Pinpoint Test J .
P0703 Brake On/Off Failure REFER to INTRODUCTION -- HYBRID ENGINES article.
P1500 Vehicle Speed Error REFER to INTRODUCTION -- HYBRID ENGINES article to diagnose the vehicle speed signal.
P1572 Brake On/Off Failure REFER to INTRODUCTION -- HYBRID ENGINES article.
All other DTCs - REFER to INTRODUCTION -- HYBRID ENGINES article.
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