Mitsubishi Grandis. Manual - part 761

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-295

STEP 9: Check inhibitor switch.

• Check ignition switch (Refer to GROUP 23A − On 

− vehicle Service − A/T Control Component 
Check 

− Inhibitor Switch Check 

P.23A-130

).

Q: Is the check result normal?

YES : 

Check intermediate connectors B-17, and 

repair if necessary. If intermediate 
connector are normal, check and repair 
harness between B-111 (terminal No. 9) 
inhibitor switch connector and C-111 
(terminal No. 51) engine-A/T-ECU 
connector.

• Check power supply line for 

open/short circuit.

NO : 

Replace ignition switch.

STEP 10: Connector check: B-111 inhibitor 
switch connector and B-116 starter connector

Q: Is the check result normal?

YES : 

Check intermediate connectors B-17, and 

repair if necessary. If intermediate 
connectors are normal, check and repair 
harness between B-111 (terminal No. 9) 
inhibitor switch connector and B-116 
(terminal No. 1) starter connector.

• Check output line for short circuit.

NO : 

Repair or replace.

STEP 11: Connector check: B-116 starter 
connector

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair or replace.

AK305632

8

9

3

4

5

1

2

6

7

10

 B-111 (B)

Connector: B-111

Harness side connector

AB

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

38

39

40

41

42

43

44

45

46

47

48

49

52

53

54

55

56

57

58

50

51

AK305632

8

9

3

4

5

1

2

6

7

10

 B-111 (B)

Connector: B-111

Harness side connector

AB

AK305631

1

 B-116 (B)

Connector: B-116

Harness side connector

AB

AK305631

1

 B-116 (B)

Connector: B-116

Harness side connector

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-296

STEP 12: Perform voltage measurement at B-116 
starter connector.

• Disconnect connector, and measure at the 

harness side.

• Ignition switch: ST

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 14.

NO : 

Go to Step 13.

STEP 13: Connector check: B-111 inhibitor 
switch connector

Q: Is the check result normal?

YES : 

Check intermediate connectors B-17, and 

repair if necessary. If intermediate 
connectors are normal, check and repair 
harness between B-111 (terminal No. 9) 
inhibitor switch connector and B-116 
(terminal No. 1) starter connector.

• Check output line for open circuit and 

damage.

NO : 

Repair or replace.

STEP 14: Connector check: B-115 starter 
connector

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Repair or replace.

STEP 15: Perform voltage measurement at B-115 
starter connector.

• Disconnect connector, and measure at the 

harness side.

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 16.

NO : 

Check and repair harness between B-115 

(terminal No. 1) starter connector and 
battery.

• Check power supply line for 

open/short circuit.

AK305631

1

 B-116 (B)

Connector: B-116

Harness side connector

AB

AK305632

8

9

3

4

5

1

2

6

7

10

 B-111 (B)

Connector: B-111

Harness side connector

AB

AK305631

1

 B-116 (B)

Connector: B-116

Harness side connector

AB

AK305630

1

 B-115 

Connector: B-115

Harness side connector

AB

AK305630

1

 B-115 

Connector: B-115

Harness side connector

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-297

STEP 16: Check harness between B-111 (terminal 
No. 9) inhibitor switch connector and B-116 
(terminal No. 1) starter connector.

NOTE: Before checking harness, check intermediate 
connectors B-17 and repair if necessary.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 17.

NO : 

Repair.

STEP 17: Check harness between B-115 (terminal 
No. 1) starter connector and battery.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Replace starter.

NO : 

Repair.

Inspection Procedure 6: Starting Impossible (Starter Operative but No Initial Combustion)

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed ignition 

circuit, failed fuel feed or other faults.

PROBABLE CAUSE

• Failed battery

• Timing belt broken

• Failed idle speed control 

• Throttle valve fouled around

• Failed ignition system

• Failed fuel system

• Failed immobilizer system

• Failed inhibitor-switch <A/T>

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1: Check battery voltage.

• Measure battery voltage at cranking.

OK: 8 V or higher

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check battery (Refer to GROUP 54 

− 

Battery 

− On-vehicle Service − Battery Test 

P.54A-6

).

STEP 2: With MUT-III of communication.

• Confirm the communication available MUT -III 

and ngine-ECU <M/T> or engine-A/T-ECU <A/T>

Q: Is the check result normal?

AK305632

8

9

3

4

5

1

2

6

7

10

 B-111 (B)

Connector: B-111

Harness side connector

AB

AK305631

1

 B-116 (B)

Connector: B-116

Harness side connector

AB

AK305630

1

 B-115 

Connector: B-115

Harness side connector

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-298

YES : 

Go to Step 3 .

NO : 

Check engine-ECU <M/T> or 
engine-A/T-ECU <A/T> power supply, 
engine control relay and ignition switch IG1 
system (Refer to Inspection Procedure 22 

P.13A-321

).

STEP 3: MUT-III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis codes (Refer 

to 

P.13A-20

)

NO : 

Go to Step 4 .

STEP 4: MUT-III actuator test

• Item 07: Fuel pump

OK: Operating sound of fuel pump can be 
heard.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Check fuel pump system (Refer to 
Inspection Procedure 23 

P.13A-328

)

STEP 5. Check timing belt for breakage.

• Engine: Cranking 

OK: Camshaft rotates. 

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Replace timing belt.

STEP 6. Check throttle body (throttle valve) 
contamination.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-383

).

STEP 7: MUT-III data list

• Item 18: Cranking signal

OK:

ON (Ignition switch: ST) 
OFF (Ignition switch: ON)

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Go to Step 8 <M/T>, Go to Step 9 <A/T>     .

STEP 8: Connector check: C-111 engine-ECU 
connector

Q: Is the check result normal?

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

38

39

40

41

42

43

44

45

46

47

48

49

52

53

54

55

56

57

58

50

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