Idle Speed Check; Idle Mixture Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

11C-10
ENGINE <4G6-MPI> -

IDLE SPEED CHECK

1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Turn the ignition switch to "LOCK" (OFF) position and
connect the MUT-II to the diagnosis connector.
3. Check the basic ignition timing.
Standard value: 5_ BTDC±3_
4. Run the engine at idle for 2 minutes.
5. Check the idle speed. Select item No. 22 and take a
reading of the idle speed.
Standard value: 750 ± 100 r/min
NOTE
The idle speed is controlled automatically by the idle speed
control (ISC) system.
6. If the idle speed is outside the standard value, inspect
the MPI components by referring to GROUP 13A -
Troubleshooting.

IDLE MIXTURE CHECK

1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Turn the ignition switch to "LOCK" (OFF) position and
connect the MUT-II to the diagnosis connector.
3. Check that the basic ignition timing is within the standard
value.
Standard value: 5_ BTDC±3_
4. Run the engine at 2,500 r/min for 2 minutes.
5. Set the CO, HC tester.
6. Check the CO contents and the HC contents at idle.
Standard value
7. If there is a deviation from the standard value, check
the following items:
D
D
D
D
D
D
D
D
On-vehicle Service
CO contents: 0.5% or less
HC contents: 100 ppm or less
Diagnosis output
Closed-loop control (When the closed-loop control
is normal, the output signal of the oxygen sensor
changes between 0 - 400 mV and 600 - 1,000 mV
at idle.)
Fuel pressure
Injector
Ignition coil, spark plug cable, spark plug
Leak in the EGR system and in the EGR valve
Evaporative emission control system
Compression pressure