GDI ± Troubleshooting
13A-36
Code No.89 Abnormal fuel pressure system Probable cause
Range of check
D Engine: Idling (during stoichio-feedback operation)
Set conditions
D Fuel injection correction value remains excessively low for ten seconds or more.
or
D Fuel injection correction value remains excessively high for ten seconds or more.
D Malfunction of the fuel pump (high pressure)
D Malfunction of the intake air temperature sensor
D Malfunction of the barometric pressure sensor
D Malfunction of the air flow sensor
D Malfunction of the engine-ECU
MUT-II Data list
13 Intake air temperature sensor. (Refer to P.13A-71.)
NG
Check the intake air temperature sensor system. (Refer to P.13A-
17, INSPECTION PROCEDURE FOR DIAGNOSIS CODE No.13.)
OK
MUT-II Data list
25 Barometric air temperature sensor. (Refer to P.13A-73.)
NG
Check the barometric pressure sensor system. (Refer to P.13A-23,
INSPECTION PROCEDURE FOR DIAGNOSIS CODE No.25.)
OK
MUT-II Data list
12 Air flow sensor. (Refer to P.13A-71.)
NG
Check the air flow sensor system. (Refer to P.13A-16, INSPEC-
TION PROCEDURE FOR DIAGNOSIS CODE No.12.)
OK
Replace the fuel pump (high pressure).
Code No.91 Electronic-controlled throttle valve system Probable cause
Range of check
D Ignition switch: ON
D Error in communication from the engine-ECU to throttle valve controller
Set conditions
D Output voltage of the throttle position sensor (2nd channel) fluctuates significantly
(approx. 1 V or more) from an expected value.
Range of check
D Ignition switch: ON
D Error in communication from the throttle valve controller to engine-ECU
Set conditions
D The throttle valve opening angle (voltage) which the engine-ECU requested of
the throttle valve controller is significantly different from output voltage of the
(2nd channel) throttle position sensor (approx. one volt).
D Short in communication line
D Malfunction of the engine-ECU
D Malfunction of the throttle valve controller
MUT-II Self-Diag code
Is any other diagnosis code than No.94 output?
Yes
Follow INSPECTION PROCEDURE FOR DIAGNOSIS CODE.
No
Check the harness wire between the throttle valve controller and
engine-ECU.
NG
Repair
OK
Replace the throttle valve controller.
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