Mitsubishi MOTORS Space Runner 1998, Workshop Manual

Page: 286 / 1164

GDI <4G9> -
Troubleshooting
13B-44
INSPECTION PROCEDURE 12
The engine stalls when decelerating Probable cause
The cause is probably insufficient intake air due to an idle speed control
malfunction, or incorrect air/fuel ratio due to an air by-pass control or EGR
malfunction.
D Malfunction of the idle speed control system
D Malfunction of the air by-pass control system
D Malfunction of the EGR valve
OK
Check the following items in the order given.
D Ignition coil, spark plug
D Clean around the throttle valve. (Refer to P.13B-86.)
OK
MUT- II Actuator test
18 Air by-pass control solenoid valve (ON/OFF) (Refer to P.13B-68.)
32 Air by-pass control solenoid valve (DUTY) (Refer to P.13B-68.)
NG
Check the air by-pass control solenoid valve system. (Refer to
P.13B-54, INSPECTION PROCEDURE 27.)
NO
MUT-
II
Data list
68 EGR valve (Refer to P.13B-66.)
NG
Check the EGR valve system. (Refer to P.13B-56, INSPECTION
PROCEDURE 29.)
OK
MUT-
II
Data list
45 Idle speed control servo
D Does the idle speed control servo position drop to steps 0
- 2 during deceleration (when engine speed is 1,000 r/min
or more)?
YES
Check the vehicle speed sensor system. (Refer to P.13B-19, Code
No.24.)
NO
MUT- II Data list
14 Throttle position sensor (Refer to P.13B-63.)
NG
Check the throttle position sensor system (Refer to P.13B-15, Code
No.14.)
NO
MUT- II Self-Diag code
Is a diagnosis code displayed?
YES
Refer to P.13B-11, INSPECTION CHART FOR DIAGNOSIS
CODES.
Have the battery terminals been disconnected recently?
YES
After the engine has warmed up, run it at idle for approximately
10 minutes.
INSPECTION PROCEDURE 13
Hesitation, sag, stumble, poor acceleration or surge Probable cause
The cause is probably a malfunction of the ignition system, or incorrect air/fuel
ratio, air by-pass control or compression pressure.
D Malfunction of the ignition system
D Malfunction of the air/fuel ratio control system
D Malfunction of the air by-pass control system
D Poor compression pressure
D Air leaking into air intake system
NO
To next page
NO
Check the injector operation sound.
NG
Check the injector system. (Refer to P.13B-22, Code No.41.)
MUT-
II
Self-Diag code
Is a diagnosis code displayed?
YES
Refer to P.13B-11, INSPECTION CHART FOR DIAGNOSIS
CODES.