Idle Speed

Because the idle speed is controlled automatically by the engine control unit through the idle speed control (ISC) solenoid valve, usually it is not necessary to check and adjust the idle speed.
However, when the test connector (Green: 1-pin) is grounded it disables the ECU control of the idle speed. If rough idling due to low idle speed occurs when the test connector is grounded, the idle speed should be adjusted.


1. Check the condition of the engine (spark plugs, leaks in hoses, etc.).
2. Turn all electrical loads OFF.
3. Warm up the engine and run it for three minutes at 2,500-3,000 rpm in neutral or park.
4. Check the initial engine timing and adjust as needed.

Fig. 21 Test Connector:

5. Connect a tachometer to engine.
6. Ground the test connector (green: 1-pin) with a jumper wire.
7. Check that the idle speed is within specification.

Idle speed: 750 ± 25 rpm in neutral or park

Fig. 26 Idle Adjustment:

8. If the idle speed is not within specification, remove the blind cap from the throttle body and adjust it by turning the air adjusting screw.
9. After adjusting the idle speed, install the blind cap and disconnect the jumper wire from the test connector.