Idle Air Control (IAC) Inspection

1. Start the engine and run it at idle.




2. Disconnect the IAC valve connector and verify that the engine rotation changes.

3. If the engine condition does not change, perform as follows.
1. Connect the IAC valve connector.




2. Connect the SSTs (NGS tester) to DLC-2.
3. Verify that DTC P0506, P0507 or P1504 is not displayed. if any of DTC is shown, carry out DTC inspection.
4. Select the SIMULATION TEST function on the NGS display.
5. Change the duty value of the IAC valve to 100 % using the IAC V PID.

6. Verify that the idle speed increases.
- If the idle speed does not change, inspect IAC valve air passage. Inspect for open or short circuit between IAC valve connector terminals and PCM connector terminals 3M and 3O.

4. Warm up the engine to normal operating temperature and run it at idle.

Engine Speed:

5. Turn the electrical loads on and verify that the engine speed is within the specification.
- If not as specified, inspect the related switches and wiring harnesses.

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