Mitsubishi Grandis. Manual - part 777

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-359

YES : 

Check and repair harness between ignition 

coil connector and engine-ECU <M/T> 
connector or engine-A/T-ECU <A/T> 
connector

a. Check and repair harness between 

B-02 (terminal No. 3) No. 1 ignition 
coil connector and C-111 (terminal 
No. 31) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

b. Check and repair harness between 

B-03 (terminal No. 3) No. 2 ignition 
coil connector and C-111 (terminal 
No. 32) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

c. Check and repair harness between 

B-04 (terminal No. 3) No. 3 ignition 
coil connector and C-111 (terminal 
No. 35) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

d. Check and repair harness between 

B-05 (terminal No. 3) No. 4 ignition 
coil connector and C-111 (terminal 
No. 52) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

• Check output line for open circuit.

NO : 

Repair or replace.

STEP 9. Connector check: C-111 engine-ECU 
<M/T> connector or engine-A/T-ECU <A/T> 
connector

Q: Is the check result normal? 

YES : 

Go to Step 10 .

NO : 

Repair or replace.

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

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TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-360

STEP 10. Check harness between ignition coil 
connector and engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

a. Check and repair harness between B-02 

(terminal No. 3) No. 1 ignition coil connector and 
C-111 (terminal No. 31) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

b. Check and repair harness between B-03 

(terminal No. 3) No. 2 ignition coil connector and 
C-111 (terminal No. 32) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

c. Check and repair harness between B-04 

(terminal No. 3) No. 3 ignition coil connector and 
C-111 (terminal No. 35) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

d. Check and repair harness between B-05 

(terminal No. 3) No. 4 ignition coil connector and 
C-111 (terminal No. 52) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

• Check output line for short circuit.

Q: Are the check results normal? 

YES : 

Go to Step 11 .

NO : 

Repair.

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

).

STEP 12. Perform resistance measurement at 
B-02, B-03, B-04 and B-05 ignition coil 
connectors.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 2 and earth.

OK: 2 

Ω or less

Q: Is the check result normal? 

YES : 

Go to Step 13.

NO : 

Check and repair harness between ignition 

coil connector and body earth

a. Check and repair harness between 

B-02 (terminal No. 2) No. 1 ignition 
coil connector and body earth

b. Check and repair harness between 

B-03 (terminal No. 2) No. 2 ignition 
coil connector and body earth

c. Check and repair harness between 

B-04 (terminal No. 2) No. 3 ignition 
coil connector and body earth

d. Check and repair harness between 

B-05 (terminal No. 2) No. 4 ignition 
coil connector and body earth

• Check earthing line for open 

circuit and damage.

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

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AK300980

1

2

3

AC

B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)

Connectors: B-02, B-03, B-04, B-05

Harness side connector

AK300980

1

2

3

AC

B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)

Connectors: B-02, B-03, B-04, B-05

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-361

STEP 13. Check harness between ignition switch 
connector and ignition coil connector.

a. Check and repair harness between C-307 

(terminal No. 2) ignition switch connector and 
B-02 (terminal No. 1) No. 1 ignition coil connector

b. Check and repair harness between C-307 

(terminal No. 2) ignition switch connector and 
B-03 (terminal No. 1) No. 2 ignition coil connector

c. Check and repair harness between C-307 

(terminal No. 2) ignition switch connector and 
B-04 (terminal No. 1) No. 3 ignition coil connector

d. Check and repair harness between C-307 

(terminal No. 2) ignition switch connector and 
B-05 (terminal No. 1) No. 4 ignition coil connector

NOTE: Before checking harness, check intermediate 
connectors C-18, C-202 and C-205, and repair if 
necessary.

• Check power supply line for damage.

Q: Are the check results normal? 

YES : 

Go to Step 14 .

NO : 

Repair.

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AK305629

 C-307

 C-307

Connector: C-307

Harness side connector

<R.H.drive vehicle>

<L.H.drive vehicle>

AB

AK300980

1

2

3

AC

B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)

Connectors: B-02, B-03, B-04, B-05

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-362

STEP 14. Check harness between ignition coil 
connector and engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

a. Check and repair harness between B-02 

(terminal No. 3) No. 1 ignition coil connector and 
C-111 (terminal No. 31) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

b. Check and repair harness between B-03 

(terminal No. 3) No. 2 gnition coil connector and 
C-111 (terminal No. 32) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

c. Check and repair harness between B-04 

(terminal No. 3) No. 3 ignition coil connector and 
C-111 (terminal No. 35) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

d. Check and repair harness between B-05 

(terminal No. 3) No. 4 ignition coil connector and 
C-111 (terminal No. 52) engine-ECU <M/T> or 
engine-A/T-ECU <A/T> connector.

• Check output line for damage.

Q: Are the check results normal? 

YES : 

Go to Step 11 .

NO : 

Repair.

AK300980

1

2

3

AC

B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)

Connectors: B-02, B-03, B-04, B-05

Harness side connector

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

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