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Pinpoint Test A: The Speed Control Is Inoperative

WARNING: This page is about a different car, the 2009 Ford Flex. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. A1 VERIFY PCM CONFIGURATION 
    • Enter the following diagnostic mode on the scan tool: Programmable Parameters.
    • Verify that the speed control is enabled in the PCM.
    • Is the speed control enabled? 
    • Yes  : GO to A2.
    • No  : ENABLE the speed control in the PCM using the scan tool programmable parameters menu. TEST the system for normal operation.
  2. A2 CHECK FOR DTCs 
    • Review the recorded DTCs from the PCM self-test.
    • Are any PCM DTCs recorded? 
  3. A3 CHECK THE VEHICLE SPEED 
    NOTE: This step may require an assistant.
    • Enter the following diagnostic mode on the scan tool: ABS Module DataLogger.
    • Monitor and record the ABS module wheel speed PID (LF_WSPD) while driving the vehicle at 48 km/h (30 mph) as indicated on the speedometer.
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Monitor and record the PCM vehicle speed PID (VSS) while driving the vehicle at 48 km/h (30 mph) as indicated on the speedometer.
    • Does the speed indicated by the ABS module wheel speed PID match the PCM vehicle speed PID? 
  4. A4 CHECK THE STOPLAMP SWITCH (BOO AND BPA) PIDs 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Monitor the PCM PIDs BOO (brake pedal top travel) and BPA (brake pedal bottom travel) while applying and releasing the brake pedal as follows:
      BRAKE PEDAL POSITION CHART

      Brake Pedal Position BOO PID BPA PID
      Released Off Off
      Applied lightly On Off
      Applied firmly On On
    • Do the PID values agree with the brake pedal position? 
  5. A5 CHECK THE SPEED CONTROL SWITCH 
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Press each speed control switch button while monitoring the speed control switch PID (SCCS).
      SPEED CONTROL SWITCH REFERENCE CHART

      Speed Control Switch SCCS PID Value
      - NONE Pressed
      RESUME RESUME
      OFF Off
      ON On
      SET + SET/+
      SET- SET/-
    • Does the PID value agree with the switch position? 
    • Yes  : GO to A6.
    • No  : If only one switch does not display the correct PID value, INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . TEST the system for normal operation.

      Otherwise, Go To PINPOINT TEST C .

  6. A6 MONITOR THE TR PID 
    • Enter the following diagnostic mode on the scan tool: PCM DataLogger.
    • Monitor the PCM PID (TR).
    • Select DRIVE.
    • Does the PID value agree with the transmission range selector lever position? 
  7. A7 CHECK FOR CORRECT PCM OPERATION 
    • Ignition OFF.
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM connectors and make sure they are seated correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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