Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 414

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.13A-76.)
MUT-II Data list
79 Throttle position sensor (1st channel) (Refer to P.13A-79.)
MUT-II Data list
68 EGR valve (Refer to P.13A-78.)
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:
Spark plug
Clean around the throttle valve (Refer to P.13A-96.)
GDI –
No
No
OK
OK
OK
OK
Troubleshooting
Probable cause
Malfunction of the electronic-controlled throttle valve
system
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.13A-13, INSPECTION CHART FOR DIAGNOSIS
CODES.)
NG
Check the accelerator pedal position switch. (Refer to P.13A-67,
INSPECTION PROCEDURE 28.)
NG
Check the throttle valve position feedback system. (Refer to
P.13A-36, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
92.)
NG
Check the EGR valve system. (Refer to P.13A-69, INSPECTION
PROCEDURE 30.)
NG
Replace the ignition coil.
13A-55