P0505

DTC P0505: Idle Control System Malfunction

NOTE:
- Information marked with an asterisk (*) applies to Canada model.
- If DTC P1519 is stored at same time as DTC P0505, troubleshooting DTC P1519 first, then recheck for DTC P0505.

1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
2. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear defogger, radiator fan, and air conditioner are off.

Is the engine running at 700 ± 50 rpm (720 ± 50 rpm) * ?

YES - Intermittent failure, system is OK at this time.

NO - If the idle speed is less than 650 rpm (670 rpm) *, go to step 3; if it's 750 rpm (770 rpm) * or higher, go to step 4.

3. Disconnect the Idle Air Control (IAC) valve 3P connector.

Does the engine speed increase or fluctuate?

YES - Check the idle speed. If the idle will not adjust properly, clean the passage in the throttle body, and then adjust the idle.

NO - Replace the IAC valve.

4. Turn the ignition switch OFF.
5. Remove the air cleaner from the throttle body.
6. Start the engine and let it idle.




7. Put your fingers on the lower port (A) in the throttle body.

Does the engine speed drop?

YES - Check the idle speed. If it's out of specification, replace the IAC valve.

NO - Check for vacuum leaks. Make sure the throttle valve is completely closed, and repair as necessary.