Mitsubishi FUEL Manual page 215

Code No. P0120 Throttle position sensor (1st channel)
system
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Range of Check
D Ignition switch: ON
Set Conditions
D The sensor output voltage is 0.2 V or less.
or
D The sensor output voltage is 4.85 V or more and the throttle position sensor
(2nd channel) output voltage is 2.5 V or more.
or
D The throttle position sensor (1st channel) and throttle position sensor (2nd
channel) combination output voltage is outside 4 - 6 V.
or
D The opening angle of throttle position sensor (1st channel) is different from
its target by 1 V or more.
or
D The throttle position sensor (1st channel) output changes within 25 mV when
the throttle control servo moves one step.
MUT-II Data list
79 Throttle position sensor (1st
channel) (Refer to P.13I-98,
DATA LIST REFERENCE
TABLE.)
NG
Check the throttle position sensor.
(Refer to P.13I-108*.)
OK
Check the following connector:
B-07
OK
Measure at throttle position sensor
connector B-07.
D Disconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK: 4.8 - 5.2 V
(2) Resistance between terminal 3
and earth
OK: 2 W or less
OK
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GDI -
Troubleshooting
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace
NG
Repair
(1) NG
Measure at throttle valve controller
connector C-160.
D Measure voltage at the throttle
valve controller connector
terminals.
D Ignition switch: ON
D Voltage between terminal 6 and
earth
OK: 4.8 - 5.2 V
Check the following connector:
C-160
Check the harness wire between the
throttle position sensor and the
throttle valve controller.
Check the trouble symptoms.
(2) NG
Check the following connector:
C-160
Check the harness wire between the
throttle position sensor and the
throttle valve controller.
Check the trouble symptoms.
Probable cause
D Malfunction of throttle position sensor
D Open or short circuit in the throttle position sensor
(1st channel) circuit or loose connector contact
D Malfunction of throttle valve controller
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/T-ECU <A/T>
OK
NG
NG
OK
NG
OK
NG
NG
OK
NG
OK
NG
13I-21
Check the following connector:
C-160
OK NG
Repair
Check the harness wire between the
throttle position sensor and the
throttle valve controller, and repair if
necessary.
Repair
Repair
Replace the throttle valve controller.
Repair
Repair
Replace the throttle valve controller.