Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 415

13A-56
INSPECTION PROCEDURE 13
Hesitation, sag, stumble, poor acceleration or surge
The cause is probably a malfunction of the ignition system, electronic-controlled throttle
valve system, compression pressure, etc.
MUT-II Self-Diag code
Is a diagnosis code displayed?
Check ignition timing. (Refer to GROUP 11A – Engine Adjustment.)
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
79 Throttle position sensor (1st channel) (Refer to P.13A-79.)
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).
MUT-II Data list
68 EGR valve (Refer to P.13A-78.)
MUT-II Actuator test
08 Purge control solenoid valve (Refer to P.13A-80.)
To the next page
GDI –
No
OK
OK
OK
OK
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
Improper compression pressure
Air stuck in the air intake system
Yes
(Refer to P.13A-13, INSPECTION CHART FOR DIAGNOSIS
CODES.)
NG
Check that the crank angle sensor and timing belt cover are properly
installed.
NG
Check the accelerator pedal position switch. (Refer to P.13A-77,
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 throttle valve position feedback system. (Refer to
P.13A-36, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
92.)
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.)
Check that air is sucked in the air intake system.
Broken intake manifold gasket
Damaged vacuum hose
Damaged air intake hose
NG
Check the EGR valve. (Refer to P.13A-69, INSPECTION PROCE-
DURE 30.)
NG
Check the purge control solenoid valve. (Refer to P.13A-70, IN-
SPECTION PROCEDURE 31.)
OK