P0505
DTC P0505: Idle Control System MalfunctionNOTE: If DTC P1519 is stored at same time as DTC P0505, troubleshoot 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 window defogger, radiator fan, and air conditioner off.
Is the engine running at 750 + 50 rpm ('02-03 models)?
YES - Intermittent failure, system is OK at this time.
NO - If the idle speed is less than 700 rpm ('02-03 models), go to step 3; if it's 800 rpm or higher ('02-03 models), go to step 4.
3. Disconnect the Idle Air Control (IAC) valve 3P connector.
Dose the engine speed increase or fluctuate?
YES - Adjust the (base) idle speed. If you cannot adjust the base idle, clean the ports in the throttle body ports.
NO - Replace the IAC valve.
4. Turn the ignition switch OFF.
5. J32A2 engine: Remove the VSA-TCS control valve assembly.
6. Remove the intake air duct from the throttle body.
7. Start the engine and let it idle.
8. Put your finger on the lower port (A) in the throttle body.
Does the engine speed drop?
YES - Adjust the idle speed. If you cannot adjust the idle, replace the IAC valve.
NO - Make sure the throttle valve is completely closed, and check for vacuum leaks. Repair as necessary.