Mitsubishi MOTORS Lancer 2005, Workshop Manual Supplement

Page: 18 / 109

MPI <4G63>
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Troubleshooting
13D-13
INSPECTION PROCEDURE FOR DIAGNOSIS CODE
Code No. 11 Oxygen sensor (front) system Probable cause
Range of Check
D More than 3 minutes passed after completion of start of engine
D
The engine coolant temperature is approximately more than 80
_
C.
D Intake air temperature 0
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55 _ C.
D The engine speed is more than 1,800
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3,500 r/min.
D The volumetric efficiency is 16
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60% or more.
Set Conditions
D For 30 seconds, the oxygen sensor output voltage continues to be 0.5 V or
lower, or 0.5 V or higher.
D The Engine-A/T-ECU monitors for this condition once during the drive cycle.
D Malfunction of the oxygen sensor (front)
D Oxygen sensor (front) circuit disconnection,
short-circuit, or connector contact defect.
D Malfunction of the engine-A/T-ECU
OK
To the next page
OK
Check the harness between the
oxygen sensor (front) and
engine-A/T-ECU.
NG
Repair
NG
OK
Check the following connector:
C-126
Repair
(2) NG
Check the oxygen sensor (front).
(Refer to P.13D-99.)
NG
Replace the oxygen sensor (front).
OK
Check the harness between the
oxygen sensor (front) and
engine-A/T-ECU.
NG
Repair
OK
Measure at the B-17 oxygen sensor
(front) connector.
D Using the test harness
(MD998464), connect the
connector, and measure at the
pickup harness.
D
Engine: After warm-up
(1) Voltage between terminal No. 2
and earth
OK: Less than 0.5 V
(2) Voltage between terminal No. 4
and the earth
D At rapid deceleration from 4,000
r/min
OK: 200 mV or less
D During rapid racing
OK: 600
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1,000 mV
(1) NG
Check the following connector:
C-124
NG
Repair
OK
Intermittent malfunction
(Refer to GROUP 00
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Points to Note
for Intermittent Malfunctions.)
OK
M.U.T.- II/III Data list
D No. 11 Oxygen sensor (front)
(Refer to P.13D-66.)
NG
Replace the engine-A/T-ECU.
OK
Check the harness between the
oxygen sensor (front) and
engine-A/T-ECU.
NG
Repair
OK
Measure at the B-17 oxygen sensor
(front) connector.
D Disconnect connector to measure
at the harness side
D
Resistance between terminal No.
2 and earth.
OK: Less than 2
:
NG
Check the following connector:
C-124
NG
Repair
NG
Check the following connector:
B-17
NG
Repair
M.U.T.-
II/III
Data list
D No. 11 Oxygen sensor (front)
(Refer to P.13D-66.)
OK
Intermittent malfunction
(Refer to GROUP 00
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Points to Note
for Intermittent Malfunctions.)