Supra Non-Turbo
Engine Control Module (ECM) controls amount of airflow into intake manifold by use of an intake air control valve. Intake air control valve is located at center of air intake chamber. See Fig 1-4. Operation of intake air control valve system provides increased power in all speed ranges.
The ECM uses various input signals for determining intake air control valve system operation. The ECM controls ground circuit for intake air control valve system Vacuum Switch Valve (VSV). The VSV controls vacuum supply from vacuum tank to the actuator which operates intake air control valve in air intake chamber.