DTC P1504: IAC Valve Circuit Malfunction: Condition

PCM monitors IAC circuit current when IAC duty is more than 18 percent. DTC is set when current is less than 100 mA or more than 4.5 amps at 77°F for one second. Possible causes are:

• IAC valve circuit malfunction.
• Connector or terminal problem.
• Short to power or ground in wiring between IAC harness connector and PCM harness connector.
• Open in wiring between IAC harness connector and PCM harness connector.
• PCM malfunction.