GDI ± Troubleshooting
13A-57
INSPECTION PROCEDURE 15
The feeling of impact when decelerating
Probable cause
The cause is probably insufficient intake air due to a faulty electronic-controlled
throttle valve system.
D Malfunction of the electronic-controlled throttle valve
system
MUT-II Self-Diag code
Is a diagnosis code displayed?
Yes
Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
MUT-II Data list
79 Throttle position sensor (1st channel) (Refer to P.13A-75.)
NG
Check the throttle valve position feedback system. (Refer to
P.13A-37, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
92.)
OK
MUT-II Data list
26 Accelerator pedal position switch (Refer to P.13A-73.)
NG
Check the accelerator pedal position switch system. (Refer to
P.13A-65, INSPECTION PROCEDURE 27.)
OK
Clean around the throttle valve. (Refer to P.13A-92.)
INSPECTION PROCEDURE 16
Knocking
Probable cause
The cause is probably incorrect detonation control or improper heat range of the
spark plugs.
D Malfunction of the detonation sensor
D Improper heat range of the spark plugs
MUT-II Self-Diag code
Is a diagnosis code displayed?
Yes
Refer to P.13A-14, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Does knocking occur when the vehicle is driven with the detonation
sensor disconnected?
(At this time, use the MUT-II to check whether the ignition timing
is retarded from when the detonation sensor connector is con-
nected.)
No
Check the detonation sensor system. (Refer to P.13A-24, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE 31.)
Yes
Check all the following items:
D Spark plug
D Foreign material (such as water or kerosine) entered the fuel
lines
INSPECTION PROCEDURE 17
Run-on (dieseling)
Probable cause
The cause is probably fuel leak from injector(s) D Malfunction of the injector
Replace the injector.
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