MPI <4G9> -
Troubleshooting
13A-143
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
Yes
Check the following items.
D
Spark plugs
D
Check if foreign materials (water, alcohol, etc.) got into fuel.
No
Check the detonation sensor system. (Refer to P.13A-113, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE P0325.)
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 connected.
MUT-
II
Self-Diag code
Are diagnosis codes displayed?
Yes
Refer to P.13A-90, INSPECTION CHART FOR DIAGNOSIS
CODES.
INSPECTION PROCEDURE 21
Dieseling
Probable cause
Fuel leakage from injectors is suspected.
D
Fuel leakage from injectors
Check the injectors for fuel leakage.