Idle Speed: Adjustments

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.

PREPARATION

1. Check engine condition (spark plugs, leaks in hoses, etc.).
2. Turn all accessories "OFF."
3. Warm engine and to operating temperature.

ADJUSTMENT

1. Connect a tachometer.

Test Connector:

2. Ground test connector (Green: 1-pin) with a jumper wire.
3. Check that idle speed is within specification:

700 ± 20 rpm in neutral or "P" range

Fig. 34 Idle Adjustment:

4. If idle speed is not within specification, correct by turning air adjusting screw.
5. After adjustment, disconnect jumper wire from test connector.