Mitsubishi FUEL Manual page 109

Code No. P0120 Throttle position sensor system
Range of Check
D Ignition switch: ON
D Excluding 60 seconds after the ignition switch is turned ON or immediately
after the engine starts.
Set Conditions
D When the idle position switch is ON, the sensor output voltage is 2 V or
more for 4 seconds
or
D The sensor output voltage is 0.2 V or less for 4 seconds
MUT-II Data list
14 Throttle position sensor
(Refer to P.13A-176, DATA LIST
REFERENCE TABLE.)
NG
Check the throttle position sensor.
(Refer to P.13A-194*.)
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 4 and
earth
(Ignition switch: ON)
OK: 4.8 - 5.2 V
(2) Resistance between terminal 1
and earth
OK: 2 W or less
OK
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MPI <6A1> -
Troubleshooting
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace
NG
Repair
(1) NG
Measure at engine-ECU connector
C-167.
D Measure voltage at the
engine-ECU terminals.
D Ignition switch: ON
D Voltage between terminal 42 and
earth
OK: 4.8 - 5.2 V
Check the following connector:
C-167
Check the harness wire between the
throttle position sensor and the
engine-ECU.
Check the trouble symptoms.
(2) NG
Check the following connector:
C-167
Check the harness wire between the
throttle position sensor and the
engine-ECU.
Check the trouble symptoms.
Probable cause
D Malfunction of throttle position sensor
D Improper connector contact, open circuit or
short-circuited harness wire
D Improper "ON" state of idle position switch
D Short circuit of the idle position switch signal line
D Malfunction of engine-ECU <M/T>
OK
NG
NG
OK
NG
OK
NG
NG
OK
NG
OK
NG
13A-109
Check the following connector:
C-167
OK NG
Repair
Check the harness wire between the
throttle position sensor and the
engine-ECU, and repair if necessary.
Repair
Repair
Replace the engine-ECU.
Repair
Repair
Replace the engine-ECU.