Mitsubishi Grandis. Manual - part 710

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-91

STEP 3. Perform voltage measurement at B-19 
cylinder 2, 3 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 .

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-19 (terminal No. 1) 
cylinder 2, 3 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.

AK300976

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2

3

4

AC

B-19 (GR)

Connector: B-19

Harness side
connector

Cylinder 2, 3 oxygen
sensor (front)

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300976

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2

3

4

AC

B-19 (GR)

Connector: B-19

Harness side
connector

Cylinder 2, 3 oxygen
sensor (front)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-92

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. 10 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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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-93

STEP 7. Check harness between B-19 (terminal 
No. 3) cylinder 2, 3 oxygen sensor (front) 
connector and C-110 (terminal No. 10) 
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.

AK300976

1

2

3

4

AC

B-19 (GR)

Connector: B-19

Harness side
connector

Cylinder 2, 3 oxygen
sensor (front)

AK305618AB

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2

3

4

5

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10

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19

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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-94

STEP 9. Check harness between B-19 (terminal 
No. 1) cylinder 2, 3 oxygen sensor (front) 
connector and B-15X (terminal No. 1) engine 
control relay connector.

NOTE: Before checking harness, check 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-19 (terminal 
No. 3) cylinder 2, 3 oxygen sensor (front) 
connector and C-110 (terminal No. 10) 
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.

AK300976

1

2

3

4

AC

B-19 (GR)

Connector: B-19

Harness side
connector

Cylinder 2, 3 oxygen
sensor (front)

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300976

1

2

3

4

AC

B-19 (GR)

Connector: B-19

Harness side
connector

Cylinder 2, 3 oxygen
sensor (front)

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