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DTC P0509: IAC Valve Sense Circuit High: Testing

  1. Start the engine. Allow the engine to idle. If the engine will not idle, maintain an engine speed between 800-1500 RPM. With the DRBIII® scan tool, read the IAC current. Is the IAC current above 999 milliamps? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the IAC motor harness connector. With the DRBIII® scan tool, monitor the IAC current. Turn the ignition on. Does the DRBIII® scan tool display IAC current at zero milliamps? If yes, replace the IAC motor. If no, go to next step.
  3. Turn the ignition off. Disconnect the IAC motor harness connector. Turn the ignition on. With the DRBIII® scan tool, actuate the ASD relay. Measure the voltage of the (K60) IAC signal circuit in the IAC motor harness connector. Is the voltage above 0.5 of a volt? If yes, repair the short to voltage in the (K60) IAC signal circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the IAC motor harness connector. Turn the ignition on. With the DRBIII® scan tool, actuate the ASD relay. Measure the voltage of the (K39) IAC motor driver circuit in the IAC motor harness connector. Is the voltage above 0.5 of a volt? If yes, repair the short to voltage in the (K39) IAC motor control circuit. If no, go to next step.
  5. Turn the ignition off. Disconnect the IAC motor harness connector. Measure the resistance across the IAC motor harness connector. Is the resistance below 5.0 ohms? If yes, repair the (K60) IAC motor signal circuit short to the (K39) IAC motor control 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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