Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 393

13A-34
Code No.79 Throttle position sensor (1st channel) system
The throttle valve controller determines a failure, and sends its result to the
engine-ECU.
Range of check
Ignition switch: ON
System voltage: 8 V or more
Set conditions
Output voltage of the sensor remains 0.2 V for one second.
or
Output voltage of the sensor remains 4.9 V for one second.
or
Output voltage of the throttle position sensor (1st and 2nd channels) remains
outside 4 – 6 V for four seconds.
MUT-II Data list
Is code No. 14, 91 or 92 output?
No
Check the throttle position sensor. (Re-
fer to P.13A-106.)
OK
Measure at throttle position sensor con-
nector A-66.
Disconnect the connector, and
measure at the harness side.
Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V
Continuity between terminal 3 and
earth
OK: Continuity
OK
Measure at throttle valve controller con-
nector B-15.
Connect the connector.
Disconnect the throttle valve control
servo connector (Close the throttle
valve fully by finger).
Voltage between terminal 7 and
earth
(Ignition switch: ON)
OK: 0.4 – 0.6 V
OK
Measure at engine-ECU connector
B-31.
Connect the connector.
Disconnect the throttle control servo
connector (Close the throttle valve
fully by finger).
Voltage between terminal 84 and
earth
(Ignition switch: ON)
OK: 4.2 – 4.8 V
OK
Replace the engine-ECU.
GDI –
Troubleshooting
Yes
Follow INSPECTION PROCEDURE
FOR DIAGNOSIS CODE.
NG
Replace
NG
Check the following connector:
B-15
Check trouble symptom.
NG
Check the following connector:
A-66
Check trouble symptom.
Check the harness between the throttle
position sensor and throttle valve con-
troller.
Repair
NG
Check the following connector:
A-66
Check trouble symptom.
Probable cause
Malfunction of the throttle position sensor (1st channel)
Open circuit or short-circuited harness wire in the
throttle position sensor (1st channel), or poor
connector contact
Malfunction of the throttle valve controller
Malfunction of the engine-ECU
NG
OK
NG
NG
OK
NG
OK
NG
NG
OK
NG
Repair
Check the harness wire between the
throttle valve controller and throttle
position sensor.
OK
NG
Repair
Replace the throttle valve controller.
Repair
Adjust the throttle position sensor. (Re-
fer to P.13A-96.)
Check trouble symptom.
NG
Replace the throttle valve controller.
Repair
Check the harness wire between the
throttle position sensor and engine-
ECU, and repair if necessary.