DTC P0506: Idle Control System RPM Lower Than Expected (2004-2006 models)
NOTE:
- If DTC P0511 is stored at the same time as DTC P0506, troubleshoot DTC P0511 first, then recheck for DTC P0506.
- Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
- Check the engine speed at idle without load condition: headlights, blower fan, rear defogger, and air conditioner off.
Is the engine running at 900+/- 50 RPM?
- YES -Intermittent failure, system is OK at this time.
- NO -Go to step 3.
- Turn the ignition switch OFF.
- Disconnect the IAC valve 3P connector.
- Start the engine, and let it idle.
- Check the engine speed at idle without load condition: headlights, blower fan, rear defogger, and air conditioner off.
Does the engine speed increase or fluctuate?
- YES -Check the idle speed under different load conditions (electrical, A/C, gear position, P/S, etc.) (see IDLE SPEED ADJUSTMENT ). If it's out of specification, clean the ports in the throttle body.
- NO -Replace the IAC valve (see THROTTLE BODY DISASSEMBLY/REASSEMBLY ).