Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 512

INSPECTION PROCEDURE 12
When the engine is hot, it stalls at idling. (Die out)
In such cases as the above, the cause is probably that ignition system, air/fuel
mixture, idle speed control (ISC) or compression pressure is defective.
In addition, if the engine suddenly stalls, the cause may also be a defective connector
contact.
Were the battery terminals disconnected?
MUT-II Self-Diag code
Are diagnosis codes displayed?
Check the ISC servo for operation sound. (Refer to P.13B-75.)
Check the injector for operation sound.
Does the engine stall right after the accelerator pedal is released?
Does the engine stall easily again?
MUT-II Data list
14 Throttle position sensor (Refer to P.13B-48.)
MUT-II Data list
13 Intake air temperature sensor (Refer to P.13B-48.)
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13B-49.)
MUT-II Actuator test
10 EGR control solenoid valve (Refer to P.13B-52.)
MUT-II Data list
59 Oxygen sensor (rear) (Refer to P.13B-51.)
Transmission: 2nd gear
Driving with throttle widely open
OK: 600 – 1,000 mV
MUT-II Data list
11 Oxygen sensor (front)
OK: 600 – 1,000 mV during sudden racing
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MPI –
No
No
OK
OK
No
Yes
OK
OK
OK
OK
OK
OK
Troubleshooting
Probable cause
Malfunction of the ignition system
Malfunction of air-fuel ratio control system
Malfunction of the ISC system
Drawing air into intake system
Improper connector contact
Yes
After warming-up, let the engine run at idling for 10 minutes.
Yes
Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.
NG
Check the ISC servo system.
(Refer to P.13B-46, INSPECTION PROCEDURE 32.)
NG
Check the injector system. (Refer to P.13B-17, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE 41.)
Yes
Clean the throttle valve area. (Refer to P.13B-65.)
No
While carrying out an intermittent malfunction simulation test (Refer
to GROUP 00 – Points to Note for Intermittent Malfunctions.),
check for sudden changes in the signals shown below.
Crank angle sensor signal
Injector drive signal
NG
Check the throttle position sensor system. (Refer to P.13B-12,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 14.)
NG
Check the intake air temperature sensor system. (Refer to
P.13B-11, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
13.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13B-13, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE 21.)
NG
Check the EGR control solenoid valve system. (Refer to P.13B-47,
INSPECTION PROCEDURE 34.)
NG
Check the oxygen sensor (rear) system. (Refer to P.13B-19, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 59.)
NG
Check the oxygen sensor (front) system. (Refer to P.13B-10, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 11.)
13B-31
Primary and secondary
ignition signal
Fuel pump drive signal
Engine ECU power supply
voltage