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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 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. C1 VERIFY SPEED CONTROL DEACTIVATION 
    • Enter the following diagnostic mode on the diagnostic tool: Powertrain Control Module (PCM), Throttle Position Sensor (TPS) PID
    • Drive the vehicle and engage the speed control.
    • Monitor the PCM PID TP voltage while tapping the brake pedal to disengage the speed control.
    • Does the PID display a return to base TPS voltage? 
    1. 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.
    2. 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 items 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?  
    1. YES  : Go to  C3.
    2. NO  : INSTALL a new speed control cable or accelerator cable. To INSTALL a new speed control cable, REFER to Speed Control Cable . TEST the system for normal operation. To INSTALL a new accelerator cable, REFER to ACCELERATION CONTROL article. 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? 
    1. YES  : Go to  C4.
    2. NO  : REFER to EXTERIOR LIGHTING article.
  4. C4 CHECK THE SPEED CONTROL DEACTIVATOR CIRCUIT 
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0010780Courtesy of FORD MOTOR CO.
    • Measure the voltage between the speed control actuator C122-9, circuit 248 (TN/OG), harness side and ground while firmly applying the brake pedal.
    • Is any voltage present? 
    1. YES  : Go to  C5.
    2. NO  : INSTALL a new speed control actuator. REFER to Speed Control Actuator . 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.
      • Fig 2: Checking Circuit For Voltage
      GF0010780Courtesy of FORD MOTOR CO.
    • Measure the voltage between the speed control actuator C122-9, circuit 248 (TN/OG), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : INSTALL a new speed control deactivator switch. REFER to Speed Control Deactivator Switch . TEST the system for normal operation.
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