Mitsubishi FUEL Manual page 224

13I-30
Code No. P0141 Oxygen sensor heater (rear) system
<sensor 2>
Range of Check
D The engine coolant temperature is approx. 20_C or more.
D The oxygen sensor heater (rear) remains on.
D The engine speed is 50 r/min or more.
D Battery voltage is 11 - 16 V.
Set Conditions
D The current, which flows through the oxygen sensor heater (rear), is 0.2 A or
less or 3.5 A or more for six seconds.
Measure at oxygen sensor (rear)
connector C-85.
D Disconnect the connector and
measure at the harness side.
D Resistance between terminals 3
and 4
OK: 11 - 18 W
OK
Check the following connector:
C-85
OK
Measure at oxygen sensor (rear)
connector C-85.
D Disconnect the connector and
measure at the harness side.
D Ignition switch: ON
D Voltage between terminal 3 and
earth
OK: System voltage
OK
Measure at engine-ECU connector
C-163 <M/T> or engine-A/T-ECU
connector C-177 <A/T>.
D Measure the voltage at the
engine-ECU terminal <M/T> or
engine-A/T-ECU terminal <A/T>.
D Ignition switch: ON
D Voltage between terminal 90
<M/T>, 26 <A/T> and earth
OK: System voltage
OK
Check the following connectors:
C-163 <M/T>, C-177 <A/T>
OK
Check the harness wires between
the oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T> and between
the oxygen sensor (rear) and the
engine control relay.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
GDI -
Troubleshooting
NG
Replace
NG
Repair
NG
Check the following connector:
C-31
Check the harness wires between
the oxygen sensor (rear) and the
engine control relay, and repair if
necessary.
NG
Check the following connectors:
C-163 <M/T>, C-177 <A/T>
Check the harness wire between the
oxygen sensor (rear) and the
engine-ECU <M/T> or
engine-A/T-ECU <A/T>, and repair if
necessary.
NG
Repair
NG
Repair
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Probable cause
D Malfunction of oxygen sensor heater (rear)
D Open or short circuit in the oxygen sensor heater
(rear) circuit or loose connector contact
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/T-ECU <A/T>
NG
OK
NG
OK
Repair
Repair