Mitsubishi FUEL Manual page 271

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.13I-98.)
Is it easy to reproduce the engine stall?
MUT-II Data list
26 Accelerator pedal position switch (Refer to P.13I-98.)
MUT-II Data list
13 Intake air temperature sensor (Refer to P.13I-98.)
MUT-II Data list
25 Barometric pressure sensor (Refer to P.13I-98.)
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13I-98.)
MUT-II Data list
59 Oxygen sensor (rear)
D Transmission: 2nd gear <M/T>, L range <A/T>
D Driving with throttle widely open
OK: 600 - 1,000 mV
MUT-II Data list
11 Oxygen sensor (front)
OK: 600 - 1,000 mV when the engine is suddenly raced
MUT-II Data list
11 Oxygen sensor (front)
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
OK
Troubleshooting
Probable cause
D Malfunction of the ignition system
D Malfunction of air/fuel ratio control system
D Malfunction of electronic-controlled throttle valve
system
D Malfunction of the throttle body
D Poor connector contact
D Improper compression pressure
D 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.13I-11, INSPECTION CHART FOR DIAGNOSIS
CODES.
NG
Check the throttle valve position feedback system.
(Refer to P.13I-57, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE P1221.)
No
Whilecarrying out anintermittent malfunction simulation test. (Refer
to GROUP 00 - Points to Note for Intermittent Malfunction.), check
for sudden changes in the following signals.
D Crank angle sensor signal
D Injector drive signal
D Fuel pump (low pressure) drive signal
D Air flow sensor
D Primary ignition signal
D Power supply to the engine-ECU <M/T> or engine-A/T-ECU
<A/T>
NG
Check the accelerator pedal position switch.
(Refer to P.13I-93, INSPECTION PROCEDURE 29.)
NG
Check the intake air temperature sensor. (Refer to P.13I-17, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0110.)
NG
Check the barometric pressure sensor. (Refer to P.13I-15, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE P0105.)
NG
Check the engine coolant temperature sensor. (Refer to P.13I-18,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0115.)
NG
Check the oxygen sensor (rear) system. (Refer to P.13I-28, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0136.)
NG
Check the oxygen sensor (front) system. (Refer to P.13I-25, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0130.)
NG
Measure fuel high-pressure between the fuel pump (high pressure)
and injector. (Refer to P.13I-122.)
OK
Check that air is sucked in the air intake system.
D Broken intake manifold gasket
D Damaged vacuum hose
D Damaged air intake hose
13I-77
NG
Repair