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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 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK THE STOPLAMP OPERATION 
    • Check the stoplamps for correct operation by applying and releasing the brake pedal and observing the stoplamps.
    • Do the stoplamps operate correctly? 
    1. Yes  : GO to C2.
    2. No  : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamps.
  2. C2 CHECK THE BRAKE PEDAL POSITION (BPP) SWITCH OPERATION 
    • Disconnect: Speed Control Actuator C122.
    • 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 while applying and releasing the brake pedal.
      Fig 1: Checking Brake Pedal Position (BPP) Switch Operation
      G03276605Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts with the brake pedal applied and 0 volts with the brake pedal released? 
    1. Yes  : GO to  C7.
    2. No  : GO to C3.
  3. C3 CHECK CIRCUIT 307 (BN) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: BPP Switch C278.
    • Measure the voltage between the BPP switch C278 pin 3, circuit 276 (BN), harness side and ground.
      Fig 2: Checking Circuit 307 (BN) For An Open
      G03276606Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to C4.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 CHECK CIRCUIT 810 (RD/LG) FOR AN OPEN 
    • Disconnect: CPP Switch C257.
    • Measure the resistance between the BPP switch C278 pin 2, circuit 810 (RD/LG), harness side and the CPP switch C257 pin 3, circuit 810 (RD/LG), harness side.
      Fig 3: Checking Circuit 810 (RD/LG) For An Open
      G03276607Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to C5.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 306 (TN/LB) FOR AN OPEN 
    • Measure the resistance between the CPP switch C257 pin 4, circuit 306 (TN/LB), harness side and the speed control actuator C122 pin 4, circuit 306 (TN/LB), harness side.
      Fig 4: Checking Circuit 306 (TN/LB) For An Open
      G03276608Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to C6.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  6. C6 CHECK THE CPP SWITCH 
    • Measure the resistance between the CPP switch C257 pin 4 (component side) and the CPP switch C257 pin 3 (component side).
      Fig 5: Checking CPP Switch
      G03276609Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new BPP switch. REFER to EXTERIOR LIGHTING . TEST the system for normal operation.
    2. No  : INSTALL a new CPP switch. REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.
  7. C7 CHECK THE DEACTIVATOR SWITCH CIRCUITRY 
    • Key in ON position.
    • Measure the voltage between the speed control actuator C122 pin 9, circuit 307 (BK/YE), harness side and ground, while firmly applying and releasing the brake pedal.
      Fig 6: Checking Deactivator Switch Circuitry
      G03276610Courtesy of FORD MOTOR CO.
    • Is the voltage 0 volts with the brake pedal firmly applied and greater than 10 volts with the brake pedal released? 
    1. Yes  : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR . TEST the system for normal operation.
    2. No  : GO to C8.
  8. C8 CHECK THE DEACTIVATOR SWITCH 
    • Key in OFF position.
    • Disconnect: Deactivator Switch C1025.
    • Measure the resistance between the deactivator switch pins (component side), while firmly pressing and releasing the brake pedal.
      Fig 7: Checking Deactivator Switch
      G03276611Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms with the brake pedal firmly applied and less than 5 ohms with the brake pedal released? 
    1. Yes  : GO to C9.
    2. No  : INSTALL a new deactivator switch. REFER to SPEED CONTROL DEACTIVATOR SWITCH . TEST the system for normal operation.
  9. C9 CHECK CIRCUIT 307 (BK/YE) FOR AN OPEN 
    • Measure the resistance between the speed control actuator C122 pin 9, circuit 307 (BK/YE), harness side and the deactivator switch C1025 pin 2, circuit 307 (BK/YE) harness side.
    • Is the resistance less than 5 ohms? 
    Fig 8: Checking Circuit 307 (BK/YE) For An Open
    G03276612Courtesy of FORD MOTOR CO.
    1. Yes  : REPAIR circuit 535 (LB/RD). TEST the system for normal operation.
    2. No  : REPAIR circuit 307 (BK/YE). TEST the system for normal operation.
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