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Pinpoint Test D: The Speed Control Does Not Disengage When The Clutch Is 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. D1 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 PID TP voltage while applying the clutch pedal to disengage the speed control.
    • Does the PID display a return to base TPS voltage? 
    1. YES  : INFORM the customer that applying the clutch pedal only disengages the speed control and the brakes must be used to slow the vehicle down.
    2. NO  : Go to  D2.
  2. D2 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  D3.
    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. D3 VERIFY AN OPEN CIRCUIT TO THE SPEED CONTROL ACTUATOR 
    • Key in OFF position.
    • Disconnect: Speed Control Actuator C122
    • Key in ON position.
    • Apply the clutch (manual transaxle).
      • Fig 1: Checking Circuit For Open
      GF0025545Courtesy of FORD MOTOR CO.
    • Measure the resistance between the speed control actuator C122-2, circuit 199 (LB/YE), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new speed control actuator. REFER to Speed Control Actuator . TEST the system for normal operation.
    2. NO  : Go to  D4.
  4. D4 CHECK THE CPP SWITCH 
    • Key in OFF position.
    • Disconnect: CPP Switch C2070
    • Apply the clutch (manual transaxle).
      • Fig 2: Checking CPP Switch
      GF0025551Courtesy of FORD MOTOR CO.
    • Measure the resistance between the CPP switch pin 3, and the CPP switch pin 4, component side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D5.
    2. NO  : INSTALL a new CPP switch. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L article. TEST the system for normal operation.
  5. D5 CHECK CIRCUIT 199 (LB/YE) FOR AN OPEN 
      Fig 3: Checking Circuit For Open
      GF0025552Courtesy of FORD MOTOR CO.
    • Measure the resistance between the speed control actuator C122-2, circuit 199 (LB/YE), harness side and the CPP switch C2070-4, circuit 199 (LB/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. D6 CHECK CIRCUIT 359 (GY/RD) FOR AN OPEN 
    • Disconnect: PCM C175b
      • Fig 4: Checking Circuit For Open
      GF0025553Courtesy of FORD MOTOR CO.
    • Measure the resistance between the CPP switch C2070-3, circuit 359 (GY/RD), harness side and the PCM C175b-41, circuit 359 (GY/RD), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. D7 CHECK FOR CORRECT PCM MODULE OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still presents? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L article or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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