The Suction Control Valve defaults open or closed depending on the model generation. Verify that the ECU is sending a pulsing ground signal to the SCV during cranking using an oscilloscope or a duty-cycle multimeter.
Manifold Absolute Pressure (MAP) sensor signal used for boost calculation. Crankshaft Position Input (AC Wave) Engine speed (RPM) signal. Critical for engine starting. G+ / G- Camshaft Position Input (AC Wave) Identifies cylinder TDC for injection synchronization. THW Water Temperature Input (Analog) toyota 2kdftv ecu pinout diagram best
Here is a breakdown of the best sources: The Suction Control Valve defaults open or closed