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Pinpoint Test A: The Speed Control Is Inoperative - No Flash Codes

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK THE SPEED CONTROL CABLE ATTACHMENT TO THE THROTTLE 
    • Key in OFF position.
    • Remove the accelerator control splash shield (if equipped). Inspect the speed control cable attachment. Check the speed control cable by pulling on the speed control cable and noting the throttle movement.
    • Is the speed control cable snapped onto the throttle body and is the speed control cable movement OK? 
    1. Yes  : GO to A2.
    2. No  : CONNECT the speed control cable. TEST the system for normal operation.
  2. A2 CHECK THE SPEED CONTROL ACTUATOR CONNECTION 
    • Check that the speed control actuator connector is fully connected.
    • Is the speed control actuator connector correctly installed? 
    1. Yes  : GO to A3.
    2. No  : INSTALL the speed control actuator connector. TEST the system for normal operation.
  3. A3 CHECK THE VOLTAGE TO THE SPEED CONTROL ACTUATOR 
    • Disconnect: Speed Control Actuator C122.
    • Key in ON position.
    • Measure the voltage between the speed control actuator C122 pin 7, circuit 16 (RD/LG), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
      Fig 1: Checking Voltage To Speed Control Actuator
      G03276586Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  A5.
    2. No  : GO to A4.
  4. A4 CHECK THE SPEED CONTROL GROUND CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between the speed control actuator C122 pin 10, circuit 57 (BK), harness side and ground.
      Fig 2: Checking Speed Control Ground Circuit 57 (BK) For An Open
      G03276587Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : REPAIR circuit 16 (RD/LG). TEST the system for normal operation.
    2. No  : REPAIR circuit 57 (BK). TEST the system for normal operation.
  5. A5 CHECK THE BRAKE PEDAL POSITION (BPP) SWITCH INPUT WITH NO BRAKES APPLIED 
    • Measure the voltage between the speed control actuator C122 pin 4, circuit 306 (TN/LB), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
      Fig 3: Checking Brake Pedal Position (BPP) Switch Input With No Brakes Applied
      G03276588Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR circuit in 306 (TN/LB). TEST the system for normal operation.
    2. No  : GO to A6.
  6. A6 CHECK THE BRAKE CIRCUIT 
    • Measure the resistance between the speed control actuator C122 pin 4, circuit 306 (TN/LB), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
      Fig 4: Checking Brake Circuit
      G03276589Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to A7.
    2. No  : GO to  A17.
  7. A7 CHECK THE DEACTIVATOR SWITCH INPUT TO THE SPEED CONTROL ACTUATOR 
    • Measure the voltage between the speed control actuator C122 pin 9, circuit 307 (BK/YE), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
    Fig 5: Checking Deactivator Switch Input To Speed Control Actuator
    G03276590Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  A10.
    2. No  : GO to A8.
  8. A8 CHECK THE DEACTIVATOR SWITCH 
    • Disconnect: Deactivator Switch C1025.
    • Measure the resistance between the deactivator switch

      C1025 pin 1, component side and the deactivator switch pin C1025 2, component side.

      Fig 6: Checking Deactivator Switch
      G03276591Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to A9.
    2. No  : INSTALL a new deactivator switch. REFER to SPEED CONTROL DEACTIVATOR SWITCH . TEST the system for normal operation.
  9. A9 CHECK THE DEACTIVATOR SWITCH POWER 
    • Key in ON position.
    • Measure the voltage between the deactivator switch C1025 pin 1, circuit 535 (LB/RD), harness side and ground.
      Fig 7: Checking Deactivator Switch Power
      G03276592Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : REPAIR circuit 307 (BK/YE). TEST the system for normal operation.
    2. No  : REPAIR circuit 535 (LB/RD). TEST the system for normal operation.
  10. A10 CHECK FOR STUCK SPEED CONTROL SWITCH 
    • Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side.
      Fig 8: Check For Stuck Speed Control Switch
      G03276593Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : GO to  A18.
    2. No  : GO to A11.
  11. A11 CHECK THE SPEED CONTROL SWITCH OPERATION 
    • Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 10, circuit 57 (BK), harness side while pressing the speed control switch ON.
      Fig 9: Checking Speed Control Switch Operation
      G03276594Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  A14.
    2. No  : GO to A12.
  12. A12 CHECK CIRCUIT 151 (LB/BK) FOR AN OPEN 
    • Disconnect: Clockspring C218a.
    • Measure the resistance between the clockspring C218a pin 6, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side.
      Fig 10: Checking Circuit 151 (LB/BK) For An Open
      G03276595Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to A13.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  13. A13 CHECK THE CLOCKSPRING FOR AN OPEN 
    • Remove the driver air bag. Refer to AIR BAG RESTRAINT SYSTEMS .
    • Measure the resistance between the top of the clockspring pin 3 (component side) and the clockspring C218a pin 6 (component side).
      Fig 11: Checking Clockspring For An Open
      G03276596Courtesy of FORD MOTOR CO.
    • Is the resistance less than 1 ohm? 
    1. Yes  : INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . INSTALL the driver air bag. REFER to AIR BAG RESTRAINT SYSTEMS . TEST the system for normal operation.
    2. No  : INSTALL a new clockspring. REFER to AIR BAG RESTRAINT SYSTEMS . INSTALL the driver air bag. REFER to AIR BAG RESTRAINT SYSTEMS . TEST the system for normal operation.
  14. A14 CHECK THE SET/ACCEL SWITCH 
    • Measure the resistance between the speed control actuator C122 pin 5, circuit 151 (LB/BK), harness side and the speed control actuator C122 pin 6, circuit 848 (DG/OG), harness side while pressing the speed control switch SET/ACCEL.
      Fig 12: Checking Set/Accel Switch
      G03276597Courtesy of FORD MOTOR CO.
    • Is the resistance between 612 and 748 ohms? 
    1. Yes  : GO to A15.
    2. No  : INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . TEST the system for normal operation.
  15. A15 CHECK THE SPEEDOMETER 
    • Check the speedometer for correct operation by driving the vehicle.
    • Does the speedometer operate correctly? 
    1. Yes  : GO to A16.
    2. No  : REFER to INSTRUMENT CLUSTER .
  16. A16 CHECK CIRCUIT 679 (GY/BK) FOR AN OPEN 
    • Disconnect: PCM C175.
    • Measure the resistance between the PCM C175 pin 68, circuit 679 (GY/BK) harness side and the speed control actuator C122 pin 3, circuit 679 (GY/BK) harness side.
      Fig 13: Checking Circuit 679 (GY/BK) For An Open
      G03276598Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  A22.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  17. A17 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Disconnect: BPP Switch C278.
    • Measure the resistance between the BPP C278 pin 5, circuit 57 (BK), harness side and ground.
      Fig 14: Checking Circuit 57 (BK) For An Open
      G03276599Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : If equipped with an automatic transmission, REPAIR circuit 810 (RD/LG). TEST the system for normal operation.

      If equipped with a manual transmission, GO to  A20.

    2. No  : REPAIR the circuit. TEST the system for normal operation.
  18. A18 CHECK THE SPEED CONTROL SWITCH 
    • Key in OFF position.
    • Remove the driver air bag. Refer to AIR BAG RESTRAINT SYSTEMS .
    • Connect: Restraint System Diagnostic Tool 418-F088 (105-R0012) or Equivalent.
    • Connect the battery. Refer to BATTERY, MOUNTING AND CABLES .
    • Disconnect: Speed Control Switches.
    • Key in ON position.
    • Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK) harness side and the speed control actuator C122 pin 10, circuit 57 (BK) harness side.
      Fig 15: Checking Speed Control Switch
      G03276600Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : GO to A19.
    2. No  : INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . DISCONNECT the battery. REFER to BATTERY, MOUNTING AND CABLES . INSTALL the driver air bag. REFER to AIR BAG RESTRAINT SYSTEMS . TEST the system for normal operation.
  19. A19 CHECK CIRCUIT 151 (LB/BK) FOR SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: Clockspring C218a.
    • Key in ON position.
    • Measure the voltage between the speed control actuator C122 pin 5, circuit 151 (LB/BK) harness side and the speed control actuator C122 pin 10, circuit 57 (BK) harness side.
      Fig 16: Checking Circuit 151 (LB/BK) For Short To Power
      G03276601Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR circuit 151 (LB/BK). DISCONNECT the battery. REFER to BATTERY, MOUNTING AND CABLES . INSTALL the driver air bag. REFER to AIR BAG RESTRAINT SYSTEMS . TEST the system for normal operation.
    2. No  : INSTALL a new clockspring. REFER to AIR BAG RESTRAINT SYSTEMS . DISCONNECT the battery. REFER to BATTERY, MOUNTING AND CABLES . INSTALL the driver air bag. REFER to AIR BAG RESTRAINT SYSTEMS . TEST the system for normal operation.
  20. A20 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CPP Switch C257.
    • Measure the resistance between the CPP switch C257 pin 4 (component side) and the CPP switch C257 pin 3 (component side).
      Fig 17: Checking Clutch Pedal Position (CPP) Switch For An Open
      G03276602Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to A21.
    2. No  : INSTALL a new CPP switch. TEST the system for normal operation.
  21. A21 CHECK CIRCUIT 306 (TN/LB) FOR AN OPEN 
    • Measure the resistance between the speed control actuator C122 pin 4, circuit 306 (TN/LB) harness side and the CPP switch C257 pin 4, circuit 306 (TN/LB) harness side.
      Fig 18: Checking Circuit 306 (TN/LB) For An Open
      G03276603Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : REPAIR circuit 810 (RD/LG). TEST the system for normal operation.
    2. No  : REPAIR circuit 306 (TN/LB). TEST the system for normal operation.
  22. A22 CHECK THE SPEED SIGNAL TO THE SPEED CONTROL ACTUATOR 
    CAUTION: The vehicle must NOT be in 4x4 mode. Make sure the vehicle is secured correctly before attempting to place the transmission range selector lever in DRIVE or in first gear if equipped with a manual transmission.
    • Connect: PCM C175.
    • Jack up the drive wheels and chock the other wheels.
      • NOTE: For vehicles with a manual transmission, place the transmission into first gear.
    • Start the vehicle, place the transmission in DRIVE and with the engine at idle allow the drive wheels to spin.
    • Measure and record the AC voltage between the speed control actuator C122 pin 3, circuit 679 (GY/BK) harness side and ground.
      Fig 19: Checking Speed Signal To The Speed Control Actuator
      G03276604Courtesy of FORD MOTOR CO.
    • Apply the brakes until the drive wheels come to a stop. Place the transmission in PARK and turn the engine off.
    • Is the recorded AC voltage between 5 and 8 volts? 
    1. Yes  : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR . TEST the system for normal operation.
    2. No  : REFER to the INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article for PCM concern.
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