P0505 NISSAN - Idle Air Control Valve
- Improper idle speed
- Faulty IACV-AAC valve
- The IACV-AAC valve harness is open or shorted
- The IACV-AAC valve circuit poor electrical connection
- Faulty Engine Control Module (ECM)
2000 Nissan Maxima
2001 Nissan Pathfinder
2000 Nissan Sentra
P0505 Ecm IAC issue 2000 & 2001 Maxima Part 1
P0505 Ecm IAC issue 2000 & 2001 Maxima Part 2
P0505 Ecm IAC issue 2000 & 2001 Maxima Part 3
P0505 Ecm IAC issue 2000 & 2001 Maxima Part 4
P0505 Ecm IAC issue 2000 & 2001 Maxima Part 5
P0505 Ecm IAC issue 2000 & 2001 Maxima Part 6
When is the code detected?
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hard to start
- Rough or erratic idle speed
P0505 NISSAN 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 takig into consideration various engine conditions, such as during warm up, deceleration, and engine load (air conditioner, power steering and cooling fan operation).
P0505 NISSAN Information for specific Nissan models
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