P0505

DTC P0505: Idle Control System Malfunction

NOTE: If DTC P1519 is stored at the 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 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, radiator fan, and air conditioner off.

Is the idle 800 ± 50 rpm?

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

NO - If the idle speed is less than 750 rpm, go to step 3; if it's 850 rpm or higher, go to step 4.

3. Disconnect the 3P connector from the IAC valve.

Does the engine speed increase or fluctuate?

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

NO - Replace the IAC valve.

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




7. Block both the upper and the lower ports (A) in the throttle body with your fingers.

Does the engine stall?

YES - Replace the IAC valve.

NO - Check for vacuum leaks, test the throttle body, and repair as necessary.