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Celica (3S-GE & 3S-GTE), Corolla (4A-GE) & MR2 Each cylinder in the intake manifold is divided into 2 parts. An intake air control valve is installed in one passage on each cylinder runner. The opening and closing of this valve gives the best airflow possible, preventing low-speed performance loss and improved fuel economy. The intake control valves are vacuum actuated. The vacuum signal is controlled by the ECU through a vacuum switching TURBOCHARGERS Celica Turbo (3S-GTE) uses a water-cooled intercooler. Intercooler system uses separate coolant reservoir and radiator from the engine coolant. Maximum boost pressure is relieved by wastegate. Wastegate has a dual control from 2 pressure signals: a direct signal from downstream of the impeller wheel, and ECU controlled signal from upstream of the impeller wheel. Celica Turbo intercooler system also has coolant level warning sensor which signals a control module when the intercooler coolant is too low. Low coolant level will cause the “CHECK ENGINE” warning light to come on. Control module is above the glove box.
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