Basic Idle Speed Adjustment - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

MPI - MPI -
On-vehicle Service On-vehicle Service

BASIC IDLE SPEED ADJUSTMENT

NOTE
(1) 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.
(2) 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.
(3) 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.
1. Before inspection and adjustment, set the vehicle to the
pre-inspection condition.
2. Connect the MUT-II to the diagnosis connector (16-pin).
NOTE
When the MUT-II is connected, the diagnosis control
terminal should be earthed.
3. Start the engine and run at idle.
4. Select the item No.30 of the MUT-II Actuator test.
NOTE
This holds the ISC servo at the basic step to adjust the
basic idle speed.
5. Check the idle speed.
Standard value:
750 ± 50 r/min
NOTE
(1) 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.
(2) 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
P.13D-79.)
6. 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.
7. Press the MUT-II clear key, and release the ISC servo
from the Actuator test mode.
13D-81