24 ES300 — NEW FEATURES 3) VVT Sensor A VVT sensor is mounted on the intake side of each cylinder head. To detect the camshaft posi- tion, a timing rotor that is provided on the VVT-i controller is used to generate 3 pulses for every 2 revolutions of the crankshaft. Intake Camshaft VVT-i Controller Timing Rotor VVT Sensor 4) IAC Valve 161ES42 A rotary solenoid type IAC valve is used to control the idle speed as on the ’98 ES300. However, IAC valve of ’99 ES300 has a built-in driver. IAC Valve IAC Valve RSO ECM ECM RSO RSC Driver ’99 ES300 ’98 ES300 161ES48