Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

1) Disconnect IAC valve hose from air intake pipe.
2) Turn ON ignition switch. Try blowing air into hose and check that air will not go in (hard to blow).





3) Using service wire, ground E33-12 terminal of ECM coupler with ignition switch OFF.
4) Turn ON ignition switch. Try blowing air into hose and check that air can be blown into air hose.
If check results are describe above and E33-12 terminal to ECM connection is OK, AC valve and its circuit are in good condition.
If not proceed to step 5).





5) With ignition switch "OFF", disconnect IAC valve coupler.
6) Check resistance between each two terminals of AC valve.

Resistance: 11 - 14 Ohms at 20°C, 68°F

If it is within specification, proceed to step 7). If not, replace.





7) Disconnect IAC valve air hose from air intake case. Try blowing air into air hose and check that air will not go in (hard to blow).





8) Connect 12V-battery to IAC valve terminals and check that air can be blown into air hose.
If check results are described above, check IAC valve harness.
If not, replace IAC valve.
9) Connect hose and coupler securely.