Mitsubishi FUEL Manual page 274

13I-80
INSPECTION PROCEDURE 12
The engine stalls when decelerating.
The cause is probably an improper air/fuel ratio due to a faulty EGR system, or poor
intake air volume due to a faulty electronic-controlled throttle valve system.
Have the battery terminals been disconnected recently?
MUT-II Self-Diag code
Is a diagnosis code displayed?
MUT-II Data list
26 Accelerator pedal position switch (Refer to P.13I-98.)
MUT-II Data list
79 Throttle position sensor (1st channel) (Refer to P.13I-98.)
MUT-II Data list
68 EGR valve (Refer to P.13I-98.)
Check ignition coil spark for each cylinder.
(1) Remove the ignition coil.
(2) Install a new spark plug to the removed ignition coil.
(3) Disconnect the injector intermediate connector.
Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.
(4) Earth the spark plug electrode securely.
(5) Check that the spark plug ignites when the engine is cranked.
Check all the following items:
D Spark plug
D Clean around the throttle valve (Refer to P.13I-98*.)
NOTE:
*: Refer to the '99 GALANT Workshop Manual (Pub. No. PWDE9611-A)
GDI -
No
No
OK
OK
OK
OK
Troubleshooting
Probable cause
D Malfunction of the electronic-controlled throttle valve
system
D Malfunction of the EGR valve
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 accelerator pedal position switch.
(Refer to P.13I-93, INSPECTION PROCEDURE 29.)
NG
Check the throttle valve position feedback system.
(Refer to P.13I-57, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE P1221.)
NG
Check the EGR valve system. (Refer to P.13I-51, INSPECTION
PROCEDURE FOR DIAGNOSIS CODE P0403.)
NG
Replace the ignition coil.