RX 300 FWD V6-3.0L (1MZ-FE) (1999)
Idle Speed/Throttle Actuator - Electronic: Testing and Inspection
Component Inspection
a. Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSC, and check that the valve is closed.
b. Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSO, and check that the valve is open.
If operation is not as specified, replace the IAC valve.