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DTC P0580: Speed Control Switch #1 Low: Testing

  1. Do not press any of the Speed Control Switch buttons. Turn ignition on, engine not running. With the DRBIII®, monitor the Speed Control voltage. Is the Speed Control voltage below 1.0 volt? If yes, go to next step. If no, go to step  7.
  2. With the DRBII®, monitor the Speed Control Switch voltage. Disconnect the Speed Control On/Off Switch harness connector. Did the voltage change to above 4.7 volts? If yes, replace the Speed Control On/Off Switch. If no, go to next step.
  3. With the DRBII®, monitor the Speed Control Switch voltage. Disconnect the Speed Control Resume/Accel Switch harness connector. Did the voltage change to above 4.7 volts? If yes, replace the Speed Control Resume/Accel Switch. If no, go to next step.
  4. Ensure the ignition is off. Disconnect the PCM harness connector. Measure the resistance between the Sensor Ground circuit and the Speed Control Switch Signal circuit at one of the Speed Control Switch harness connectors. Is the resistance below 5.0 ohms? If yes, repair the Sensor Ground circuit that is shorted to the Speed Control Switch Signal circuit. If no, go to next step.
    5. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal-to-pin connection. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  5. Measure the resistance between ground and the Speed Control Switch Signal circuit at the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the Speed Control Switch Signal circuit. If no, go to next step.
    6. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  6. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    7. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  7. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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