BASIC
IDLE SPEED ADJUSTMENT
CAUTION- The standard idling speed has been adjusted by the speed adjusting screw (SAS) by the manufacturer, and there should usually be no need for readjustment.
- If the adjustment has been changed by mistake, the idle speed may become too high or the idle speed may drop too low when loads from components such as the A/C are placed on the engine. If this occurs, adjust by the following procedure.
- The adjustment, if made, should be made after first confirming that the spark plugs, the injectors, the idle speed control servo, the compression pressure, etc., are all normal.
- Before inspection and adjustment, set the vehicle to the pre-inspection condition.
- Connect the MUT-II/III to the diagnosis connector (16-pin).
NOTE: When the MUT-II/III is connected, the diagnosis control terminal should be earthed.
- Start the engine and run at idle.
- Select the item No. 30 of the MUT-II/III Actuator test.
NOTE: This holds the ISC servo at the basic step to adjust the basic idle speed.
- Check the idle speed.
- The engine speed may be 20 to 100 r/min lower than indicated above for a new vehicle [driven approximately 500 km or less], but no adjustment is necessary.
- If the engine stalls or the engine speed is low even though the vehicle has been
driven approximately 500 km or more, it is probable that deposits are adhered to the throttle
valve, so clean it (Refer to
).
Standard value: 700 ±
50 r/min
NOTE:
)
- If not within the standard value range, turn the speed adjusting screw (SAS) to make the necessary adjustment.
NOTE: If the idling speed is higher than the standard value range even when the SAS is fully
closed, check whether or not there is any indication that the fixed SAS has been moved. If there
is an indication that it has been moved, adjust the fixed SAS.
- Press the MUT-II/III clear key, and release the ISC servo from the Actuator test mode.
NOTE: Unless the ISC servo is released, the Actuator test mode will continue 27 minutes.
- Turn the ignition switch to "LOCK" (OFF) position.
- Disconnect the MUT-II/III.
- Start the engine again and let it run at idle speed for about 10 minutes; check that the idling condition is normal.