MPI – Troubleshooting
13-33
INSPECTION PROCEDURE 19
Surge
Probable cause
Defective ignition system, abnormal air-fuel ratio, etc. are suspected. D Malfunction of the ignition system
D Malfunction of air-fuel ratio control system
MUT-II Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.
No
Check the injectors for operation sound.
NG
Check the injector system. (Refer to P.13-15, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE 41.)
OK
Check the ignition timing.
(Refer to GROUP 11 – Engine Adjustments.)*
NG
Check that the crank angle sensor and the timing belt cover are
installed properly.
OK
MUT-II: Check if surge occurs.
(Refer to P.13-52, INSPECTION PROCEDURE 44.)
OK
Check the fuel pressure. (Refer to P.13-30.)*
OK
Check the following items.
D Check the ignition coil, spark plugs, spark plug cables.
D Check the waste gate actuator.
NOTE
*: Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
INSPECTION PROCEDURE 20
Knocking
Probable cause
In cases as the above, the cause is probably that the detonation control is defective
or the heat value of the spark plug is inappropriate.
D Defective detonation sensor
D Inappropriate heat value of the spark plug
MUT-II Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.
No
Does knocking occur when driving with the sensor disconnected?
At this time, use the MUT-II to check if the timing is retarded
compared to when the detonation sensor connector is con-
nected.
No
Check the detonation sensor system. (Refer to P.13-15, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE 31.)
Yes
Check the following items.
D Spark plugs
D Check if foreign materials (water, alcohol, etc.) got into fuel.
INSPECTION PROCEDURE 21
Dieseling
Probable cause
Fuel leakage from injectors is suspected. D Fuel leakage from injectors
Check the injectors for fuel leakage.
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