Esteem 1.8L
- Ensure ignition is off. Disconnect IAC valve connector. Measure resistance between IAC valve terminals. Resistance should be 8.6-10.6 ohms. Measure continuity between IAC valve terminals and valve body. No continuity should be present. If measurements are to specification, go to next step. If measurements are not to specification, replace IAC valve.
- Reconnect IAC valve connector. Start engine and operate until it reaches normal operating temperature. Disconnect IAC valve connector and check idle RPM. Connect 12-volt battery negative terminal to IAC terminal No. 3. Connect 12-volt battery positive terminal to IAC terminal No. 2. See Fig 1. If idle speed increases, IAC valve is okay. If idle speed does not increase, replace IAC valve.
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