Mitsubishi FUEL Manual page 156

13A-156
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.13A-199*.)
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
26 Idle position switch (Refer to P.13A-176.)
MUT-II Data list
13 Intake air temperature sensor (Refer to P.13A-176.)
MUT-II Data list
25 Barometric pressure sensor (Refer to P.13A-176.)
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13A-176.)
MUT-II Actuator test
10 EGR control solenoid valve (Refer to P.13A-183.)
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MPI <6A1> -
No
No
OK
OK
No
Yes
OK
OK
OK
OK
Troubleshooting
Probable cause
D Malfunction of the ignition system
D Malfunction of air/fuel ratio control system
D Malfunction of the ISC system
D Drawing air into intake system
D Improper connector contact
Yes
After warming-up, let the engine run at idling for 10 minutes.
Yes
Refer to P.13A-99, INSPECTION CHART FOR DIAGNOSIS
CODES.
NG
Check the ISC system. (Refer to P.13A-137,INSPECTIONPROCE-
DURE FOR DIAGNOSIS CODE P0505.)
NG
Check the injector system. (Refer to P.13A-127, INSPECTION
PROCEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203,
P0204.)
Yes
Clean the throttle valve
area.
(Refer to P.13A-184*.)
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.
D Crank angle sensor signal
D Air flow sensor signal
D Injector drive signal
NG
Check the idle position switch system. (Refer to P.13A-139, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0510.)
NG
Check the intake air temperature sensor system. (Refer to
P.13A-105, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0110.)
NG
Check the barometric pressuresensor system. (Refer to P.13A-103,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0105.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13A-106, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
NG
Check the EGR control solenoid valve system. (Refer to P.13A-133,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0403.)
Check and adjust the
fixed SAS.
(Refer to P.13A-187*.)
D Primary and secondary
ignition signal
D Fuel pump drive signal
D Engine-ECUpowersupply
voltage