Troubleshooting

DTC P0505 Idle Air Control System

CIRCUIT DESCRIPTION

DTC Detecting Condition:

The rotary solenoid type IAC valve is located in front of the intake air chamber and the intake air bypassing the throttle valve is directed to the IAC valve through a passage.

In this way, the intake air volume bypassing the throttle valve is regulated, controlling the engine speed.

The ECM operates only the IAC valve to perform idle-up and provide feedback for the target idle speed.

Wiring Diagram:

Step 1:

Step 2 - 4:

Step 5 - 7:

INSPECTION PROCEDURE

HINT: Read freeze frame data using hand held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected, when troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.