Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

INSPECT IAC VALVE OPERATION




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.

INSPECT INTAKE AIR CONTROL VALVE VACUUM




a. Using a 3-way connector, connect vacuum gauge to the actuator hose.
b. Start the engine.




c. While the engine is idling, check that the vacuum gauge needle does not move.
d. Rapidly depress the accelerator pedal to fully open position and check that the vacuum gauge needle momentarily fluctuates up to approx. 26.7 kPa (200 mm Hg, 7.9 in.Hg). (The actuator rod is pulled out.)



1. INSPECT INTAKE AIR CONTROL VALVE




a. With 26.7 kPa (200 mmHg, 7.9 in.Hg) of vacuum applied to the actuator, check that the actuator rod moves.
b. One minute after applying the vacuum in (a), check that the actuator rod does not return.
If the operation is not as specified, replace the intake air control valve.

2. INSPECT VACUUM TANK
LOCATION: The LH side member under the battery tray.




a. Check that air flows from port B to port A.
b. Check that air does not flow from port A to port B.




c. Plug port B with your finger, and apply 26.7 kPa (200 mmHg, 7.9 in.Hg) of vacuum to port A, and check that there is no change is vacuum after one minute.
If the operation is not as specified, replace the vacuum tank.

3. INSPECT VSV