Idle Speed Control (ISC) Valve [DIAGRAM showing Rotor, Coil, Valve Shaft, Valve components and electrical schematic with S1, B1, S3, R2, S2, S4 connections to Rotor] CHECK FOR OPERATING SOUND FROM ISC VALVE Check that there is a clicking sound immediately after stopping the engine. [DIAGRAM F16216 showing hand checking ISC valve with ear symbol] REMOVAL OF ISC VALVE 1. DRAIN COOLANT 2. DISCONNECT ISC VALVE CONNECTOR 3. DISCONNECT NO.2 WATER BY-PASS HOSE AND AIR HOSE [DIAGRAM F16217 showing disconnection of hoses] 4. REMOVE ISC VALVE (a) Remove the two bolts, ISC valve and gasket. (b) Disconnect the No.1 water by-pass hose from the ISC valve. (c) (7M-GTE) Remove the seal washer and check valve from the air intake chamber. [DIAGRAM F16218 showing ISC valve removal]