Detection Condition

• DTC P0505 indicates desired RPM could not be reached or controlled during KOEO self-test.
• DTC P1504 indicates an electrical load failure on IAC output circuit.
• DTC P1507 indicates engine idle speed is less than desired RPM.

Idle Air Control (IAC) valve controls engine speed and provides a dashpot function. IAC valve meters intake air around throttle plate through a bypass within IAC valve assembly and throttle body. PCM determines desired idle speed or bypass air and signals IAC valve through a specified duty cycle. The IAC valve responds by positioning to control amount of bypass air.