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DTC P0580: Speed Control Switch #1 Low: Testing

  1. Do not press any of the speed control switch buttons. Ignition on, engine not running. With the DRBIII® scan tool, read the Speed Control voltage. Is the Speed Control voltage below 1.0 volt? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Ignition on, engine not running. With the DRBIII® scan tool, 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. Perform. If no, go to next step.
  3. Ignition on, engine not running. With the DRBIII® scan tool, monitor the speed control switch voltage. Disconnect the speed control Resume/Accel switch harness connector. Did the volt change to above 4.7 volts? If yes, replace the speed control Resume/Accel switch. If no, go to next step.
    4. 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. Install Miller Special Tool (8815) to perform diagnosis.
  4. Turn the ignition off. Disconnect the speed control On/Off switch harness connector. Disconnect the speed control Resume/Accel switch harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (K4) sensor ground circuit and the (V37) S/C switch signal circuit at the speed control switch. Is the resistance below 5.0 ohms? If yes, repair the (V37) S/C switch signal circuit short to (K4) sensor ground 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. Install Miller Special Tool (8815) to perform diagnosis.
  5. Turn the ignition off. Disconnect the speed control On/Off Switch harness connector. Disconnect the speed control Resume/Accel switch harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (V37) S/C switch signal circuit to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (V37) S/C switch signal circuit. If no, go to next step.
  6. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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