Idle Air Control (IAC) Inspection

Engine coolant temperature compensation inspection
1. Connect the WDS or equivalent to DLC-2.
2. Select the following PIDs.
- ECT
- RPM

3. Verify that the engine is in cold condition, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.
- If the engine speed does not decrease or decreases slowly, carry out the following:
- ECT sensor inspection
- IAC valve inspection

Load compensation inspection
1. Warm up the engine to normal operating temperature and run it at idle.
2. Connect the WDS or equivalent to DLC-2.
3. Select the following PID.
- RPM

4. Turn the electrical loads on and verify that the engine speed is within the specification.
- If not as specified, carry out the following:
- A/C switch inspection
- P/S pressure switch inspection
- IAC valve inspection






NOTE: Excludes temporary idle speed drop just after the loads are turned on.