BE–184 BODY ELECTRICAL SYSTEM – CRUISE CONTROL SYSTEM Idle Switch Circuit CIRCUIT DESCRIPTION When the idle switch is turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the discrepancy between the throttle valve position and the actuator position sensor value to enable accurate cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the engine, so also inspect the engine. WIRING DIAGRAM ECM IDL1 E9 64 R R 2 (2JZ-GE) 3 (2JZ-GTE) Throttle Position Sensor 3 IJ1 Cruise Control ECU 12 V IDL 21 R N08435