Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

On-Vehicle Inspection
1. With ignition switch "OFF", disconnect Idle Air Control (IAC) valve coupler.





2. Check resistance between A and B / B and C terminal.

Resistance: 19.3 - 22.3 ohms at 20°C (68°F)

- If it is within specification, proceed to next operation check. If not, replace.
3. Connect IAC valve coupler and warm up engine.
4. Stop engine and disconnect IAC valve coupler with ignition switch OFF.





5. Disconnect IAC valve air hose from air cleaner outlet hose.
6. Connect 12V-battery positive cable to IAC valve B terminal and negative cable to IAC valve A terminal. Try blowing air into air hose and check that air will not go in (hard to blow). If check result is not satisfactory, replace IAC valve.





7. Connect 12V-battery positive cable to IAC valve B terminal and negative cable to IAC valve C terminal and check that air can be blown into air hose. If check result is not satisfactory, check IAC valve air passage. If air passage is OK, replace IAC valve.