Mitsubishi Grandis. Manual - part 768

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-323

STEP 5. Perform voltage measurement at C-111 
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. 34 and earth, also 

between terminal No. 43 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Check and repair C-111 engine-ECU <M/T> 

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

NO : 

Go to Step 6 .

STEP 6. 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 7 .

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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AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

32

33

34

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TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-324

STEP 7. Perform voltage measurement at C-111 
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. 50 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Go to Step 8 .

STEP 8. Connector check: C-307 ignition switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair or replace.

STEP 9. Check ignition switch.

• Check ignition switch (Refer to GROUP 54A − 

Ignition Switch 

− Inspection 

P.54A-31

).

Q: Is the check result normal?

YES : 

Check intermediate connector C-18, C-205 

and C-202, and repair if necessary. If 
intermediate connector is normal, check and 
repair harness between C-307 (terminal No. 
2) ignition switch connector and C-111 
(terminal No. 50) engine-ECU <M/T> 
connector or engine-A/T-ECU <A/T> 
connector.

• Check output line for open/short 

circuit and damage.

NO : 

Replace ignition switch.

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

32

33

34

35

36

37

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43

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52

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57

58

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51

1

2

3

4

5

6

AK305629

 C-307

 C-307

Connector: C-307

Harness side connector

<R.H.drive vehicle>

<L.H.drive vehicle>

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-325

STEP 10. Perform voltage measurement at C-111 
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: OFF

• Voltage between terminal No. 57 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Check and repair harness between B-15X 

(terminal No. 2) engine control relay 
connector and C-111 (terminal No. 57) 
engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

• Check earthing line for open/short 

circuit.

STEP 11. Check harness between B-15X (terminal 
No. 3 and No. 4) engine control relay connector 
and battery.

NOTE: Before checking harness, check intermediate 
connector A-16, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair.

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

32

33

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AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-326

STEP 12. Check harness between C-307 (terminal 
No. 2) ignition switch connector and C-111 
(terminal No. 50) engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

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

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Repair.

STEP 13. Perform resistance measurement at 
C-111 engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 33, No. 42 and 

earth.

OK: 2 

Ω or less

Q: Are the check results normal?

YES : 

Replace engine-ECU <M/T> or 

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

NO : 

Go to Step 14

1

2

3

4

5

6

AK305629

 C-307

 C-307

Connector: C-307

Harness side connector

<R.H.drive vehicle>

<L.H.drive vehicle>

AB

AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

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AK305625AB

Connector: C-111

<L.H. drive vehicles>

<R.H. drive vehicles>

C-111 (GR)

C-111 (GR)

Harness side connector

31

32

33

34

35

36

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