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Pinpoint Test D: DTC P0579 Or DTC P0581 - Speed Control Switch Circuit Failure

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 CHECK THE SPEED CONTROL SWITCH CIRCUITRY FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Turn the parking lamps on.
    • For gasoline vehicles, measure the voltage between the PCM C175b-19, circuit 151 (LB/BK), harness side and ground; and between the PCM C175b-30, circuit 133 (BK), harness side and ground.
      Fig 1: Checking Speed Control Switch Circuitry For Short To Voltage (1 Of 2)
      G04651307Courtesy of FORD MOTOR CO.
    • For diesel vehicles, measure the voltage between the PCM C1381a-31, circuit 151 (LB/BK), harness side and ground; and between the PCM C1381a-24, circuit 133 (BK), harness side and ground.
      Fig 2: Checking Speed Control Switch Circuitry For Short To Voltage (2 Of 2)
      G04651308Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : TURN the parking lamps off. Go to D2.

    No  : TURN the parking lamps off. Go to  D4.

  2. D2 CHECK CIRCUITS 151 (LB/BK) AND 133 (BK) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Clockspring C218a.
    • Key in ON position.
    • Turn the parking lamps on.
    • For gasoline vehicles, measure the voltage between the PCM C175b-1P, circuit 151 (LB/BK), harness side and ground; and between the PCM C175b-30, circuit 133 (BK), harness side and ground.
      Fig 3: Checking Circuits 151 (LB/BK) And 133 (BK) For Short To Voltage (1 Of 2)
      G04651309Courtesy of FORD MOTOR CO.
    • For diesel vehicles, measure the voltage between the PCM C1381a-31, circuit 151 (LB/BK), harness side and ground; and between the PCM C1381a-24, circuit 133 (BK), harness side and ground.
      Fig 4: Checking Circuits 151 (LB/BK) And 133 (BK) For Short To Voltage (2 Of 2)
      G04651310Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

    No  : TURN the parking lamps off. Go to D3.

  3. D3 CHECK THE CLOCKSPRING FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Connect: Clockspring C218a.
    • Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Connect the restraint system diagnostic tool (418-F403) to the upper clockspring air bag connector.
    • Disconnect: Upper Clockspring.
    • WARNING: Make sure there is no one inside the vehicle and that there is nothing blocking or set in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury.
    • Connect the battery.
    • Key in ON position.
    • Turn the parking lamps on.
    • For gasoline vehicles, measure the voltage between the PCM C175b-19, circuit 151 (LB/BK), harness side and ground; and between the PCM C175b-30, circuit 133 (BK), harness side and ground.
      Fig 5: Checking Clockspring For Short To Voltage (1 Of 2)
      G04651311Courtesy of FORD MOTOR CO.
    • For diesel vehicles, measure the voltage between the PCM C1381a-31, circuit 151 (LB/BK), harness side and ground; and between the PCM C1381a-24, circuit 133 (BK), harness side and ground.
      Fig 6: Checking Clockspring For Short To Voltage (2 Of 2)
      G04651312Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : INSTALL a new clockspring. CLEAR the DTCs. REPEAT the self-test.

    No  : INSTALL a new speed control switch(es) harness. REFER to SPEED CONTROL SWITCH . CLEAR the DTCs. REPEAT the self-test.

  4. D4 CHECK THE SPEED CONTROL SWITCH CIRCUITRY FOR A SHORT TO GROUND 
    • Key in OFF position.
    • For gasoline vehicles, measure the resistance between the PCM C175b-19, circuit 151 (LB/BK), harness side and ground; and between the PCM C175b-30, circuit 133 (BK), harness side and ground.
      Fig 7: Checking Speed Control Switch Circuitry For Short To Ground (1 Of 2)
      G04651313Courtesy of FORD MOTOR CO.
    • For diesel vehicles, measure the resistance between the PCM C1381a-31, circuit 151 (LB/BK), harness side and ground; and between the PCM C1381a-24, circuit 133 (BK), harness side and ground.
      Fig 8: Checking Speed Control Switch Circuitry For Short To Ground (2 Of 2)
      G04651314Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes  : Go to  D7.

    No  : Go to D5.

  5. D5 CHECK THE CLOCKSPRING FOR A SHORT TO GROUND 
    • Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Upper Clockspring.
    • For gasoline vehicles, measure the resistance between the PCM C175b-19, circuit 151 (LB/BK), harness side and ground; and between the PCM C175b-30, circuit 133 (BK), harness side and ground.
      Fig 9: Checking Clockspring For Short To Ground (1 Of 2)
      G04651315Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C1381a-31, circuit 151 (LB/BK), harness side and ground; and between the PCM C1381a-24, circuit 133 (BK), harness side and ground.
      Fig 10: Checking Clockspring For Short To Ground (2 Of 2)
      G04651316Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes  : INSTALL a new speed control switch(es) harness. REFER to SPEED CONTROL SWITCH . INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.

    No  : Go to D6.

  6. D6 CHECK CIRCUITS 151 (LB/BK) AND 133 (BK) FOR A SHORT TO GROUND 
    • Disconnect: Clockspring C218a.
    • For gasoline vehicles, measure the resistance between the PCM C175b-19, harness side and ground; and between the PCM C175b-30, circuit 133 (BK), harness side and ground.
      Fig 11: Checking Circuits 151 (LB/BK) And 133 (BK) For Short To Ground (1 Of 2)
      G04651317Courtesy of FORD MOTOR CO.
    • For diesel vehicles, measure the resistance between the PCM C1381a-31, harness side and ground; and between the PCM C1381a-24, circuit 133 (BK), harness side and ground.
      Fig 12: Checking Circuits 151 (LB/BK) And 133 (BK) For Short To Ground (2 Of 2)
      G04651318Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes  : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.

    No  : REPAIR the circuit in question. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.

  7. D7 CHECK THE SPEED CONTROL SWITCH CIRCUITRY FOR AN OPEN 
    • For gasoline vehicles, measure the resistance between the PCM C175b-19, circuit 151 (LB/BK), harness side and the PCM C175b-30, circuit 133 (BK), harness side.
      Fig 13: Checking Speed Control Switch Circuitry For An Open (1 Of 2)
      G04651319Courtesy of FORD MOTOR CO.
    • For diesel vehicles, measure the resistance between the PCM C1381a-31, circuit 151 (LB/BK), harness side and the PCM C1381a-24, circuit 133 (BK), harness side.
      Fig 14: Checking Speed Control Switch Circuitry For An Open (2 Of 2)
      G04651320Courtesy of FORD MOTOR CO.
    • Is the resistance between 4,100 and 4,550 ohms? 

    Yes  : Go to  D11.

    No  : Go to D8.

  8. D8 CHECK CIRCUITS 151 (LB/BK) AND 133 (BK) FOR AN OPEN 
    • Disconnect: Clockspring C218a.
    • For gasoline vehicles, measure the resistance between the PCM C175b-19, circuit 151 (LB/BK), harness side and the clockspring C218a-7, circuit 151 (LB/BK), harness side; and between the PCM C175b-30, circuit 133 (BK), harness side and the clockspring C218a-2, circuit 133 (BK), harness side.
      Fig 15: Checking Circuits 151 (LB/BK) And 133 (BK) For An Open (1 Of 2)
      G04651321Courtesy of FORD MOTOR CO.
    • For diesel vehicles, measure the resistance between the PCM C1381a-31, circuit 151 (LB/BK), harness side and the clockspring C218a-7, circuit 151 (LB/BK), harness side; and between the PCM C1381a-24, circuit 133 (BK), harness side and the clockspring C218a-2, circuit 133 (BK), harness side.
      Fig 16: Checking Circuits 151 (LB/BK) And 133 (BK) For An Open (2 Of 2)
      G04651322Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes  : If not equipped with steering wheel audio controls, Go to D9.

    If equipped with steering wheel audio controls, Go to  D10.

    No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

  9. D9 CHECK THE CLOCKSPRING 
    • Remove the driver air bag. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Upper Clockspring.
    • Measure the resistance between the clockspring C218a-7, component side and the upper clockspring connector pin 1, component side; and between the clockspring C218a-2, component side and the upper clockspring connector pin 2, component side.
      Fig 17: Checking Clockspring
      G04651323Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes  : INSTALL a new speed control switch(es) harness. REFER to SPEED CONTROL SWITCH . CLEAR the DTCs. REPEAT the self-test.

    No  : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.

  10. D10 CHECK THE CLOCKSPRING FOR AN OPEN 
    • Remove the driver air bag. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Upper Clockspring.
    • Measure the resistance between the clockspring C218a-7, component side and the upper clockspring connector pin 1, component side; and between the clockspring C218a-2, component side and the upper clockspring connector pin 3, component side.
      Fig 18: Checking Clockspring For Open
      G04651324Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes  : INSTALL a new speed control switch(es) harness. REFER to SPEED CONTROL SWITCH . CLEAR the DTCs. REPEAT the self-test.

    No  : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.

  11. D11 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the PCM connectors and make sure they are seated correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES . INSTALL the driver air bag. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. INSTALL the driver air bag. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test.

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