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Pinpoint Test C: The Speed Control Does Not Disengage When The Brakes Are Applied

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 VERIFY SPEED CONTROL DEACTIVATION 
    • Enter the following diagnostic mode on the diagnostic tool: PCM Throttle Position Sensor (TPS) PID.
    • Drive the vehicle and engage the speed control.
    • Monitor the PCM TPS PID voltage while tapping the brake pedal to disengage the speed control.
    • Does the PID display a return to base TPS voltage? 

    Yes  : INFORM the customer that tapping the brake pedal only disengages the speed control and the brakes must be used to slow the vehicle down.

    No  : GO to C2.

  2. C2 CHECK THE SPEED CONTROL CABLE/ACCELERATOR CABLE 
    • Key in OFF position.
      • NOTE: Make sure the floor mat, insulation, wiring harnesses location, and other item do not interfere with the accelerator pedal and linkage.
    • Visually inspect the speed control cable connections, the throttle body linkage, and the speed control actuator pulley cover.
    • Are the speed control cable connections, the throttle body linkage, and the speed control actuator pulley cover OK? 

    Yes  : GO to C3.

    No  : INSTALL a new speed control cable or accelerator cable. To INSTALL a new speed control cable, REFER to SPEED CONTROL CABLE  in this article. TEST the system for normal operation. To INSTALL a new accelerator cable, REFER to ACCELERATION CONTROL . TEST the system for normal operation.

  3. C3 CHECK THE STOPLAMPS FOR CORRECT OPERATION 
    • Check the stoplamps for correct operation by firmly applying and releasing the brake pedal.
    • Do the stoplamps operate correctly? 

    Yes  : GO to C4.

    No  : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamps.

  4. C4 CHECK THE SPEED CONTROL DEACTIVATOR CIRCUIT 
    • Key in ON position.
    • Measure the voltage between the speed control actuator C122-9, circuit 248 (TN/OG), harness side and ground while firmly applying the brake pedal.
      Fig 1: Checking Speed Control Deactivator Circuit
      G04621322Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : GO to C5.

    No  : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR  in this article. TEST the system for normal operation.

  5. C5 CHECK CIRCUIT 248 (TN/OG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Speed Control Deactivator Switch C277.
    • Key in ON position.
    • Measure the voltage between the speed control actuator C122-9, circuit 248 (TN/OG), harness side and ground.
      Fig 2: Checking Circuit 248 (TN/OG) For Short To Voltage
      G04621323Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : REPAIR the circuit in question. TEST the system for normal operation.

    No  INSTALL a new speed control deactivator switch. REFER to SPEED CONTROL DEACTIVATOR SWITCH  in this article. TEST the system for normal operation.

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