GDI ± Troubleshooting
13A-35
Code No.79 Throttle position sensor (1st channel) system Probable cause
The throttle valve controller determines a failure, and sends it result to the engine-ECU.
Range of check
D Ignition switch: ON
D System voltage: 8 V or more
Set conditions
D Output voltage of the sensor remains 0.2 V for one second.
or
D Output voltage of the sensor remains 4.9 V for one second.
or
D Output voltage of the throttle position sensor (1st and 2nd channels) remains
outside 4 ± 6 V for four seconds.
D Malfunction of the throttle position sensor (1st channel)
D Open circuit or short-circuited harness wire in the
throttle position sensor (1st channel), or poor
connector contact
D Malfunction of the throttle valve controller
D Malfunction of the engine-ECU
NG
Repair
OK
Replace the throttle valve controller.
MUT-II Data list
Is code No. 14, 91 or 92 output?
Yes
Follow INSPECTION PROCEDURE
FOR DIAGNOSIS CODE.
No
Check the throttle position sensor. (Re-
fer to P.13A-103.)
NG
Replace
OK
Measure at throttle position sensor con-
nector A-03.
D Disconnect the connector, and
measure at the harness side.
D Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK: 4.8 ± 5.2 V
D Continuity between terminal 3 and
earth
OK: Continuity
NG
Check the following connector:
C-48
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
throttle valve controller and throttle
position sensor.
OK
Measure at throttle valve controller con-
nector C-48.
D Connect the connector.
D Disconnect the throttle control servo
connector (Close the throttle valve
fully by finger).
D Voltage between terminal 7 and
earth
(Ignition switch: ON)
OK: 0.4 ± 0.6 V
NG
Check the following connector:
A-03
NG
Repair
OK
Check trouble symptom.
NG
Check the harness between the throttle
position sensor and throttle valve con-
troller.
OK
Adjust the throttle position sensor. (Re-
fer to P.13A-92.)
Check trouble symptom.
NG
Replace the throttle valve controller.
NG
Repair
OK
Measure at engine-ECU connector
C-19.
D Connect the connector.
D Disconnect the throttle control servo
connector (Close the throttle valve
fully by finger).
D Voltage between terminal 78 and
earth (Ignition switch: ON)
OK: 3.9 ± 4.9 V
NG
Check the following connector:
A-03
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
throttle position sensor and engine-
ECU, and repair if necessary.
OK
Replace the engine-ECU.
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