Mitsubishi FUEL Manual page 117

Check the following connector:
B-109
OK
Measure at right bank oxygen
sensor (rear) connector B-109.
D Disconnect the connector and
measure at the harness side.
D Resistance between terminal 1
and earth
OK: 2 W or less
OK
Measure at right bank oxygen
sensor (rear) connector B-109.
D Use the test harness
(MD998464) to connect the
connector, and measure at the
pick-up harness side.
D Engine: 2,500 r/min (after
warming up)
(1) Voltage between terminal 1 and
earth
OK: 0.5 V or less
(2) Voltage between terminal 3 and
earth
OK: 0 V and 0.8 V alternate.
OK
Measure at engine-ECU connector
C-166.
D Measure the voltage at the
engine-ECU terminal.
D Engine: 2,500 r/min (after
warming up)
D Voltage between terminal 74 and
earth
OK: 0 V and 0.8 V alternate.
OK
Check the following connectors:
C-166, C-167
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
MPI <6A1> -
NG
Repair
NG
Check the following connector:
C-167
Check the harness wire between the
right bank oxygen sensor (rear) and
the engine-ECU.
Check the trouble symptoms.
Replace the engine-ECU.
(1) NG
Check the following connector:
C-167
Check the harness wire between the
right bank oxygen sensor (rear) and
the engine-ECU, and repair if
necessary.
(2) NG
Check the right bank oxygen sensor
(rear). (Refer to P.13A-193.)
Check the following connector:
C-166
Check the harness wire between the
right bank oxygen sensor (rear) and
the engine-ECU, and repair if
necessary.
NG
Check the following connector:
C-166
Check the harness wire between the
right bank oxygen sensor (rear) and
the engine-ECU, and repair if
necessary.
NG
Repair
OK
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Troubleshooting
NG
OK
NG
OK
NG
NG
OK
NG
OK
NG
OK
NG
OK
13A-117
Repair
Repair
Repair
Replace
Repair
Repair