EG–297 ENGINE – SFI SYSTEM (2JZ–GTE) IAC VALVE REMOVAL 1. DRAIN ENGINE COOLANT 2. DISCONNECT IAC VAVE CONNECTOR 3. REMOVE IAC VALVE (a) Remove the 2 bolts, and disconnect the IAC valve from the air intake chamber. (b) Remove the gasket. Connector P11386 (c) Disconnect these hoses from the IAC valve, and remove the IAC valve: (1) Air hose (2) Water bypass hose (from No.2 water bypass pipe) (3) Water bypass hose (from No.4 water bypass pipe) (2) (1) (3) P11418 (d) Remove the seal washer and check valve. Check Valve Seal Washer P12820 IAC VALVE INSPECTION INSPECT IAC VALVE OPERATION (a) Apply battery voltage to terminals B1 and B2, and while repeatedly grounding S1–S2–S3–S4–S 1 in sequence, and check that the valve moves toward the closed position. Closed B1 S3 S1 S4 S2 B2 Battery P11389 (b) Apply battery voltage to terminals B1 and B2, and while repeatedly grounding S4–S3–S2–S1–S 4 in sequence, check that the valve moves toward the open position. If operation is not as specified, replace the IAC valve. Open B1 S3 S1 S4 S2 B2 Battery P11386