P0505 HONDA - Idle Air Control Valve
- Faulty Idle Air Control Valve (IACV) valve
- IAC valve harness is open or shorted
- IAC valve circuit poor electrical connection
2001 and 2003 Honda Odyssey
2003 Honda Pilot
Factory Service Bulletin OBDII Code P0505
When is the code detected?
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hard to start
- Rough or erratic idle speed
P0505 HONDA Description
One step of IACV-AAC valve movement causes the respective opening of the air by-pass passage. (i.e. when the step advances, the opening is enlarged.) The opening of the valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM then controls the step position of the IACV-AAC valve so that engine speed coincides with the target value memorized in ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warm-up, deceleration, and engine load (air conditioner, power steering, and cooling fan operation).
P0505 HONDA Information for specific Honda models
P0505 1997 HONDA CIVIC
P0505 1998 HONDA CIVIC
P0505 1999 HONDA CIVIC
P0505 2000 HONDA CIVIC
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