Mitsubishi Outlander (2003+). Manual — part 51
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-67
Code No. P0135: Oxygen Sensor Heater (Front) System <Sensor 1>
OPERATION
Power is supplied to the heater power terminal
(terminal No. 1) of the oxygen sensor (front) con-
nector from the engine control relay (terminal No.
1).
The heater (terminal No. 3) of the oxygen sensor
(front) connector is controlled by the power tran-
sistor in the engine-ECU (terminal No. 60).
FUNCTION
The power supply to the oxygen sensor heater
(front) is controlled by the ON/OFF control of the
power transistor in the engine-ECU.
Heating the oxygen sensor heater (front) enables
the oxygen sensor to provide good response
even when the exhaust emission temperature is
low.
AK300267
1
2
3
4
1
2
3
4
57 58
60 61
53
52
51
55
54
56
59
62
AB
B-17X
4
W-B
W-B
3
1
2
Oxygen sensor (front)
1
2
3
4
To engine-ECU
Engine-ECU
60
Y-R
R
Engine
control
relay
Oxygen sensor (front) heater circuit
B-112
(MU8026053)
Battery
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V:Violet
C-136
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-68
TROUBLE JUDGMENT
Check Conditions
The engine coolant temperature is approximately.
20
C or higher.
The oxygen sensor heater (front) is in "ON" posi-
tion.
The engine speed is 50 r/min or more.
The battery voltage is 11
-
16 V.
Judgment Criteria
The heater current of oxygen sensor heater
(front) is below 0.2 A or above 3.5 A for 1 second.
PROBABLE CAUSE
Failed oxygen sensor heater
Open/short circuit in oxygen sensor (front) circuit
or loose connector contact
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-112 oxygen sensor
(front) connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair.
STEP 2. Measure resistance at B-112 oxygen
sensor (front) connector.
Disconnect connector, and measure at sensor
side.
Resistance between terminal No. 1 and No. 3.
OK: 4.5
-
8.0
W
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace oxygen sensor (front).
STEP 3. Measure voltage at B-112 oxygen sensor
(front) connector.
Disconnect connector, and measure at harness
side.
Ignition switch: ON
Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 4 .
AK300264
1
2
3
4
AB
B-112 (B)
Harness side connector
Oxygen sensor (front)
Connector: B-112
AK300264
1
2
3
4
AB
B-112 (B)
Harness side connector
Oxygen sensor (front)
Connector: B-112
AK300264
1
2
3
4
AB
B-112 (B)
Harness side connector
Oxygen sensor (front)
Connector: B-112
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-69
STEP 4. Connector check: B-17X engine control
relay connector
Q: Is the check result normal?
YES :
Check and repair harness between B-112
(terminal No. 1) oxygen sensor connector
and B-17X (terminal No. 1) engine control
relay connector.
Check power supply line for
open/short circuit.
NO :
Repair.
STEP 5. Measure voltage at C-136 engine-ECU
connector.
Measure engine-ECU terminal voltage.
Ignition switch: ON
Voltage between terminal No. 60 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
STEP 6. Connector check: C-136 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
AK300255
2
1
3
4
Relay box’s
triangle marks
AB
CONNECTOR: B-17X
B-17X
Harness side
connector
AK300264
1
2
3
4
AB
B-112 (B)
Harness side connector
Oxygen sensor (front)
Connector: B-112
AK300268
58
60
61
53 52 51
55 54
56
59
62
57
AB
CONNECTOR: C-136
C-136
Harness side connector
AK300268
58
60
61
53 52 51
55 54
56
59
62
57
AB
CONNECTOR: C-136
C-136
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-70
STEP 7. Check harness between B-112 (terminal
No. 3) oxygen sensor (front) connector and C-136
(terminal No. 60) engine-ECU connector.
Check earthing line for open/short circuit.
Q: Is the check result normal?
YES :
Replace engine-ECU.
NO :
Repair.
STEP 8. Connector check: C-136 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair.
STEP 9. Check harness between B-112 (terminal
No. 1) oxygen sensor (front) connector and B-
17X (terminal No. 1) engine control relay
connector.
Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair.
AK300264
1
2
3
4
AB
B-112 (B)
Harness side connector
Oxygen sensor (front)
Connector: B-112
AK300268
58
60
61
53 52 51
55 54
56
59
62
57
AB
CONNECTOR: C-136
C-136
Harness side connector
AK300268
58
60
61
53 52 51
55 54
56
59
62
57
AB
CONNECTOR: C-136
C-136
Harness side connector
AK300264
1
2
3
4
AB
B-112 (B)
Harness side connector
Oxygen sensor (front)
Connector: B-112
AK300255
2
1
3
4
Relay box’s
triangle marks
AB
CONNECTOR: B-17X
B-17X
Harness side
connector
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