Mitsubishi Grandis. Manual — part 707

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-79

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. 24 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-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.

AK305618AB

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27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

AK305618AB

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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-80

STEP 7. Check harness between B-23 (terminal
No. 3) cylinder 1, 4 oxygen sensor (rear)
connector and C-110 (terminal No. 24)
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.

STEP 8. 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 9 .

NO :

Repair or replace.

AK300975

1

2

3

4

AC

B-23 (B)

Connector: B-23

Harness side
connector

Cylinder 1, 4 oxygen
sensor (rear)

AK305618AB

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Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

AK305618AB

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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-81

STEP 9. Check harness between B-23 (terminal
No. 1) cylinder 1, 4 oxygen sensor (rear)
connector and B-15X (terminal No. 1) engine
control relay connector.

NOTE: Before checking harness intermediate
connector C-116, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 10 .

NO :

Repair.

STEP 10. Check harness between B-23 (terminal
No. 3) cylinder 1, 4 oxygen sensor (rear)
connector and C-110 (terminal No. 24)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

• Check earthing line for damage.

Q: Is the check result normal?

YES :

Go to Step 11 .

NO :

Repair.

AK300975

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2

3

4

AC

B-23 (B)

Connector: B-23

Harness side
connector

Cylinder 1, 4 oxygen
sensor (rear)

AK300967

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1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300975

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2

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4

AC

B-23 (B)

Connector: B-23

Harness side
connector

Cylinder 1, 4 oxygen
sensor (rear)

AK305618AB

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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-82

STEP 11. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Replace engine-ECU <M/T> or

engine-A/T-ECU <A/T>.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

Code No. P0150: Cylinder 2, 3 Oxygen Sensor (Front) System

OPERATION

• The sensor signal is inputted to the engine-ECU

<M/T> or engine-A/T-ECU <A/T> (terminal No.
108) from the cylinder 2, 3 oxygen sensor (front)
output terminal (terminal No. 4).

• The front cylinder 2, 3 oxygen sensor (front)

(terminal No. 2) is earthed with engine-ECU
<M/T> or engine-A/T-ECU <A/T> (terminal No.
96).

FUNCTION

• The cylinder 2, 3 oxygen sensor (front) converts

the concentration of oxygen in the exhaust
emission into a voltage and inputs the signal to
the engine-ECU <M/T> or engine-A/T-ECU
<A/T>.

AK305555

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

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6

Cylinder 2, 3 oxygen
sensor (front)

AB

Cylinder 2, 3 oxygen sensor (front) circuit

Engine-ECU <M/T> or
engine-A/T-ECU <A/T>

B

W

B

From engine control relay

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4

96

108

B-19
MU802665

C-113

(MU803805)

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>

C-115