DTC P0505: Idle Air Control Valve Circuit Malfunction: Condition
WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when PCM detects Idle Air Control (IAC) valve circuit current is less than 100 milliamps or more than 4.5 amps for one second. Monitoring is performed while IAC duty is 18-70 percent. This is a continuous monitor. MIL illuminates if PCM detects malfunction during first drive cycle. Possible causes are:
- IAC valve circuit malfunction.
- PCM malfunction.
- Short or open circuit between IAC valve and PCM.