Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

1. Disconnect ISC valve electrical connector when engine is cold and idling.
2. Note engine speed and reconnect connector.
3. Warm engine to normal operating temperature and again disconnect electrical connector.
4. Ensure engine speed is lower when electrical connector is disconnected warm then when disconnected when it is cold.
5. Connect ISC valve electrical connector. Ensure test connector is not grounded and that idle speed is within specification.
6. Again disconnect ISC electrical connector with engine at normal operating temperature.
7. Ensure engine speed decreases, then reconnect electrical connector.
8. Check ISC valve resistance across its terminals. If not 6.3 - 9.9 ohms at operating temperature, replace BAC valve.