
MPI –
Troubleshooting
13-27
INSPECTION PROCEDURE 10
Idling speed is low. (Improper idling speed)
Probable cause
In cases such as the above, the cause is probably that the intake air volume during
idling is too small.
D
Malfunction of the ISC servo system
D
Malfunction of the throttle body
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.
No
Check the ISC servo for operation sound.
NG
Check the ISC servo system.
(Refer to P.13-44, INSPECTION PROCEDURE 33.)
OK
MUT-
II
Data list
26 Idle position switch (Refer to P.13-58.)
NG
Check the idle position switch system.
(Refer to P.13-38, INSPECTION PROCEDURE 26.)
OK
MUT-
II
Data list
21 Engine coolant temperature sensor (Refer to P.13-57.)
NG
Check the engine coolant temperature sensor system.
(Refer to P.13-10, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 21.)
OK
Basic idle speed adjustment (Refer to P.13-30.)*
Check trouble symptom.
NG
Clean the throttle valve area.
Adjust the fixed SAS. (Refer to P.13-30.)*
NOTE
*:
Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).