Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

ISC Control System Circuit Diagram:

Circuit Diagram

ISC Control System Inspection:

Measure Battery Voltage Of ISC Valve
- All accessories switched OFF.
- Using a voltmeter, check that the meter indicates battery voltage during cranking and for ten seconds after starting.

Inspecting ISC Control System Operation:

Inspect ISC Valve Operation
- Check that air does not flow from pipe E to pipe F.

Inspecting ISC Control System Operation:

- Apply battery voltage across the terminals.
- Check that air flows from pipes E to F.
- If operation is not as specified, replace the ISC valve.