LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2010 >> Fusion S, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1506 (Engine Controls - Pinpoint Test A: No Start Through Pinpoint Test DJ: Air Conditioner Evaporator Temperature (ACET) Sensor - (Except Diesel & Hybrid)) >> Pinpoint Test DF: Vehicle Speed Circuit (VSC) Check >> Test Procedure

Test Procedure

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
  1. DF1 DTCS P0500, P0503, P1501 AND P1502: CHECK THE VEHICLE SPEED CIRCUIT FOR INTERMITTENT CONCERNS 
    NOTE: The PCM detected an error in the vehicle speed information received from the ABS control module. This test step checks for the recurrence of this vehicle speed error.
    • Key in ON position.
    • Diagnostic tool connector connected.
    • Clear the DTCs.
    • Gradually increase the vehicle speed to 80 km/h (50 mph).
    • Coast to an idle and stop the vehicle.
    • Key in OFF position.
    • Key in ON position.
    • Check for continuous memory DTCs:

    Are DTCs P0500, P0503, P1501 or P1502 present? 

    Yes No
    Key in OFF position.
    The vehicle speed input is incorrect.
    GO to  DF2.    		 Key in OFF position.
    The vehicle speed input is correct. The fault that produced the original DTC may be intermittent.
    GO to  DF5.
  2. DF2 CHECK THE VSC CIRCUIT FOR A SHORT TO PWR IN THE HARNESS 
    • PCM connector disconnected.
    • Anti-lock Brake System (ABS) Module connector disconnected.
    • Key in ON position.
    • Measure the voltage between:
      (+) PCM Connector, Harness Side (-)
      VSC Ground

    Is the voltage less than 1 V? 

    Yes No
    GO to  DF3. Key in OFF position.
    GO to  DF6.
  3. DF3 CHECK FOR AN OPEN VSC BETWEEN THE PCM AND THE ABS CONTROL MODULE 
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-) Anti-lock Brake System (ABS) Module Connector, Harness Side
      VSC VSC

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  DF4. REPAIR the open circuit.
    GO to  DF7.
  4. DF4 CHECK THE VSC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS 
    • Diagnostic tool connector disconnected.
    • Measure the resistance between:
      (+) PCM Connector, Harness Side (-)
      VSC Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes No
    REFER to ANTI-LOCK CONTROL to continue diagnosis of the ABS control module, its speed sensors and its wheel speed sensor harness circuits.
    If these components are working properly, INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .
    GO to  DF7.    		 GO to  DF6.
  5. DF5 VISUAL INSPECTION 
    • Visually inspect the VSC circuit harness and connectors at the PCM, ABS, and other VSC user modules for damage, loose connections, loose grounds, or incorrect routing.
      NOTE: Refer to SYSTEM WIRING DIAGRAMS for harness, module, and connector locations.

    Did the visual inspection reveal a potential failure? 

    Yes No
    REPAIR as necessary.
    GO to  DF7.    		 Unable to duplicate or identify the fault at this time.
    REFER to ANTI-LOCK CONTROL to continue diagnosis of the ABS control module, its speed sensors and its wheel speed sensor harness circuits.
  6. DF6 VERIFY IF THE VSC IS SHORTED IN THE HARNESS OR ANOTHER MODULE 
    • Determine which, if any, modules are connected to the VSC. Refer to SYSTEM WIRING DIAGRAMS . If no other modules are connected to the VSC, GO to the "YES" Action To Take.
    • One at a time, disconnect the modules associated with the VSC. After disconnecting each module, test again for a short circuit. (Refer to test step that sent you here). Repeat until each associated module is disconnected or the short circuit is eliminated.

    Did the short circuit remain after all associated modules were disconnected? 

    Yes No
    REPAIR the short circuit.
    GO to  DF7.    		 REFER to the appropriate service information article for further diagnosis of the appropriate module.
    GO to  DF7.
  7. DF7 VSC REPAIR VERIFICATION DRIVE CYCLE 
    NOTE: Warm the engine to a normal operating temperature before continuing.
    NOTE: Carry out the VSC drive cycle at least 3 times as described below.
    • Automatic Transmission Drive Cycle:
      • Place the transmission range selector lever in DRIVE range.
      • Accelerate heavily to 56 km/h (35 mph).
      • Coast down to an idle and stop the vehicle.
      • Cycle the key OFF and ON.
    • Manual Transmission Drive Cycle:
      • Accelerate moderately to 64 km/h (40 mph), while shifting from first to second gear.
      • Coast down to an idle and stop the vehicle.
      • Cycle the key OFF and ON.
    • Key in OFF position.
    • Key in ON position.
    • Check for continuous memory DTCs:

    Are DTCs P0500, P0503, P1501 or P1502 present? 

    Yes No
    DISREGARD the current diagnostic trouble code (DTC) at this time. ADDRESS the next DTC. GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS . The repair has been verified.
scientia non olet · About LEMON Manuals