EG-225 ENGINE – SFI SYSTEM (2JZ-GE) IDLE AIR CONTROL (IAC) VALVE ON–VEHICLE INSPECTION 1. INSPECT IAC VALVE FOR OPERATING SOUND Check that there is a clicking sound immediately after stopping the engine. If operation is not as specified, check the IAC valve, wiring and ECM. 2. California only: INSPECT AIR ASSIST SYSTEM A. Warm up engine Allow the engine to warm up to normal operating temperature. B. Check idle speed Idle speed (Transmission in neutral position): 700 ± 50 rpm C. Check IAC valve operation With engine idling, pinch the air hose and check that engine speed drops, and then returns back up to idle speed. If operation is not as specified, check the IAC valve, wiring and ECM. Pinch Air Hose P11466 3. INSPECT IAC VALVE RESISTANCE Using an ohmmeter, measure the resistance between the terminals (B1 (or B2) to others). Resistance: At 20°C (68°F) 18–22 Ω If the resistance is not as specified, replace the IAC valve. Ohmmeter S3 S4 B1 B2 S1 S2 P11980 P11465