Mitsubishi Grandis. Manual — part 703
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-63
Code No. P0135: Cylinder 1, 4 Oxygen Sensor (Front) Heater System
OPERATION
• Power is supplied to the heater power terminal
(terminal No. 1) of the Cylinder 1, 4 oxygen
sensor (front) connector from the engine control
relay (terminal No. 1).
• The heater (terminal No. 3) of the Cylinder 1, 4
oxygen sensor (front) connector is controlled by
the power transistor in the engine-ECU <M/T> or
engine-A/T-ECU <A/T> (terminal No. 25).
FUNCTION
• The power supply to the cylinder 1, 4 oxygen
sensor (front) heater is controlled by the ON/OFF
control of the power transistor in the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
• Heating the cylinder 1, 4 oxygen sensor (front)
heater enables the cylinder 1, 4 oxygen sensor
(front) to provide good response even when the
exhaust emission temperature is low.
AK305552
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2
3
4
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
1
2
3
4
AB
4
3
1
2
Cylinder 1, 4 oxygen sensor (front)
1
2
3
4
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
25
Engine
control
relay
W-G
R-W
R-W
P-L
W-G
Battery
B-15X
C-110
(MU803802)
B-22
MU802665
Cylinder 1, 4 oxygen sensor (front) heater circuit
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
To engine-ECU <M/T> or
engine-A/T-ECU <A/T>
J/C (4)
11
7
C-116
To engine-ECU <M/T> or
engine-A/T-ECU <A/T>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-64
TROUBLE JUDGMENT
Check Conditions
• 60 seconds have elapsed since the previous
monitoring started.
• Engine coolant temperature is 20°C or higher.
• While cylinder 1, 4 oxygen sensor (front) heater is
on.
• Battery positive voltage is 11 − 16 V.
Judgment Criterion
• Cylinder 1, 4 oxygen sensor (front) heater current
has continued to be 0.16 A or lower, or 7.5 A or
higher for 4 seconds.
PROBABLE CAUSE
• Failed cylinder 1, 4 oxygen sensor (front) heater
• Open/short circuit in cylinder 1, 4 oxygen sensor
(front) circuit or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-22 cylinder 1, 4
oxygen sensor (front) connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Perform resistance measurement at B-22
cylinder 1, 4 oxygen sensor (front) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminal No. 1 and No. 3.
OK: 4.5
− 8.0 Ω
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace cylinder 1, 4 oxygen sensor (front).
STEP 3. Perform voltage measurement at B-22
cylinder 1, 4 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 .
AK300973
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2
3
4
AB
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B-24 (
"•)
ƒRƒlƒNƒ^![
ƒRƒlƒNƒ^![: B-24
Harness side
connector
B-22 (GR)
Connector: B-22
Cylinder 1, 4 oxygen
sensor (front)
AC
AK300973
1
2
3
4
AB
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B-24 (
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ƒRƒlƒNƒ^![: B-24
Harness side
connector
B-22 (GR)
Connector: B-22
Cylinder 1, 4 oxygen
sensor (front)
AC
AK300973
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2
3
4
AB
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B-24 (
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ƒRƒlƒNƒ^![: B-24
Harness side
connector
B-22 (GR)
Connector: B-22
Cylinder 1, 4 oxygen
sensor (front)
AC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-65
STEP 4. Connector check: B-15X engine control
relay connector
Q: Is the check result normal?
YES :
Check intermediate connector C-116, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-22 (terminal No. 1)
cylinder 1, 4 oxygen sensor (front)
connector and B-15X (terminal No. 1)
engine control relay connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
STEP 5. Perform voltage measurement at C-110
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Measure engine-ECU <M/T> or engine-A/T-ECU
<A/T> terminal voltage.
• Ignition switch: ON
• Voltage between terminal No. 25 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK300973
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2
3
4
AB
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B-24 (
"•)
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ƒRƒlƒNƒ^![: B-24
Harness side
connector
B-22 (GR)
Connector: B-22
Cylinder 1, 4 oxygen
sensor (front)
AC
AK305618AB
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25
26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-66
STEP 6. Connector check: C-110 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace.
STEP 7. Check harness between B-22 (terminal
No. 3) cylinder 1, 4 oxygen sensor (front)
connector and C-110 (terminal No. 25)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check earthing line for open/short circuit.
Q: Is the check result normal?
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Repair.
AK305618AB
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25
26
27
Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
AK300973
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2
3
4
AB
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B-24 (
"•)
ƒRƒlƒNƒ^![
ƒRƒlƒNƒ^![: B-24
Harness side
connector
B-22 (GR)
Connector: B-22
Cylinder 1, 4 oxygen
sensor (front)
AC
AK305618AB
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25
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Connector: C-110
<L.H. drive vehicles>
<R.H. drive vehicles>
C-110 (GR)
C-110 (GR)
Harness side connector
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