Mitsubishi FUEL Manual page 166

13A-166
INSPECTION PROCEDURE 20
Knocking
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.
MUT-II Self-Diag code
Are diagnosis codes displayed?
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 connected.
Check the following items.
D Spark plugs
D Check if foreign materials (water, alcohol, etc.) got into fuel.
INSPECTION PROCEDURE 21
Dieseling
Fuel leakage from injectors is suspected.
Check the injectors for fuel leakage.
INSPECTION PROCEDURE 22
Too high CO and HC concentration when idling
Abnormal air/fuel ratio is suspected.
MUT-II Self-Diag code
Are diagnosis codes displayed?
Check the ignition timing.
(Refer to GROUP 11A - On-vehicle Service.)
MUT-II Data list
21 Engine coolant temperature sensor. (Refer to P.13A-176.)
MUT-II Data list
13 Intake air temperature sensor (Refer to P.13A-176.)
MUT-II Data list
25 Barometric pressure sensor (Refer to P.13A-176.)
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MPI <6A1> - MPI <6A1> -
No
Yes
No
OK
OK
OK
OK
Troubleshooting Troubleshooting
Probable cause
D Defective detonation sensor
D Inappropriate heat value of the spark plug
Yes
Refer to P.13A-99, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Check thedetonationsensorsystem. (Referto P.13A-130,INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE P0325.)
Probable cause
D Fuel leakage from injectors
Probable cause
D Malfunction of the air/fuel ratio control system
D Deteriorated catalyst
Yes
Refer to P.13A-99, INSPECTION CHART FOR DIAGNOSIS
CODES.
NG
Check that the crank angle sensor is installed properly.
NG
Check the engine coolant temperature sensor system.
(Refer to P.13A-106, INSPECTION PROCEDURE FOR DIAGNO-
SIS CODE P0115.)
NG
Check the intake air temperature sensor system. (Refer to
P.13A-105, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0110.)
NG
Check the barometric pressuresensor system. (Refer to P.13A-103,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE P0105.)