Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 411

13A-52
INSPECTION PROCEDURE 10
When the engine is hot, it stalls at idling. (Die out)
The cause is probably an improper air/fuel ratio, faulty electronic-controlled throttle
valve system, compression pressure. In addition, if the engine stalls suddenly, another
possible cause might be a poor connector contact.
Have the battery terminals been disconnected recently?
MUT-II Self-Diag code
Is a diagnosis code displayed?
MUT-II Data list
79 Throttle position sensor (1st channel) (Refer to P.13A-79.)
Is it easy to reproduce the engine stall?
MUT-II Data list
26 Accelerator pedal position switch (Refer to P.13A-76.)
MUT-II Data list
13 Intake air temperature sensor (Refer to P.13A-75.)
MUT-II Data list
25 Barometric pressure sensor (Refer to P.13A-76.)
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13A-76.)
MUT-II Data list
11 Oxygen sensor
OK: 600 – 1,000 mV when the engine is suddenly raced
MUT-II Data list
11 Oxygen sensor
OK: 0 – 400 mV and 600 – 1,000 mV alternates when the
engine is idling (wait for four minutes after the engine
started).
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GDI –
No
No
OK
Yes
OK
OK
OK
OK
OK
OK
Troubleshooting
Probable cause
Malfunction of the ignition system
Malfunction of the air/fuel ratio control system
Malfunction of the electronic-controlled throttle valve
system
Malfunction of the throttle body
Poor connector contact
Improper compression pressure
Air stuck in the air intake system
Yes
Warm up the engine, and then let it run at idle for approx. ten
minutes.
Yes
Refer to P.13A-13, INSPECTION CHART FOR DIAGNOSIS
CODES.
NG
Check the throttle position sensor (1st channel) system. (Refer
to P.13A-34, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 79.)
No
While carrying out an intermittent malfunction simulation test. (Refer
to GROUP 00 – Points to Note for Intermittent Malfunction.), check
for sudden changes in the following signals.
Crank angle sensor signal
Injector drive signal
Fuel pump (low pressure) drive signal
Air flow sensor
Primary ignition signal
Power supply to the engine-ECU
NG
Check the accelerator pedal position switch. (Refer to P.13A-67,
INSPECTION PROCEDURE 28.)
NG
Check the intake air temperature sensor. (Refer to P.13A-16, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 13.)
NG
Check the barometric pressure sensor. (Refer to P.13A-22, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE 25.)
NG
Check the engine coolant temperature sensor. (Refer to P.13A-18,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE 21.)
NG
Check the oxygen sensor system. (Refer to P.13A-14, INSPECTION
PROCEDURE FOR DIAGNOSIS CODE 11.)
NG
Measure fuel high-pressure between the fuel pump (high pressure)
and injector. (Refer to P.13A-98.)
OK
Check that air is sucked in the air intake system.
Broken intake manifold gasket
Damaged vacuum hose
Damaged air intake hose
NG
Repair