Mitsubishi Grandis. Manual — part 759

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-287

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 54A

−

Battery

− On-vehicle Service − Battery Test

P.54A-6

).

STEP 2: 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 8 .

NO :

Go to Step 3 .

STEP 3: Connector check: C-111 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair or replace.

STEP 4: Perform voltage measurement at C-111
engine-ECU connector.

• Disconnect connector, and measure at the

harness side.

• Ignition switch: ST

• Voltage between terminal No. 51 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 5 .

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

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-288

STEP 5: Connector check: C-307 ignition switch
connector

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair or replace.

STEP 6: Check ignition switch.

• Check ignition switch (Refer to GROUP 54A −

Ignition Switch

− Inspection

P.54A-31

).

Q: Is the check result normal?

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

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-289

YES :

Check intermediate connectors C-18 and

B-17, and repair if necessary. If intermediate
connector are normal, check and repair
harness between C-111 (terminal No. 51)
engine-ECU connector and C-307 (terminal
No. 5) ignition switch connector.

• Check power supply line for

open/short circuit.

NO :

Replace ignition switch.

STEP 7: Connector check: C-307 ignition switch
connector and B-116 starter connector

Q: Is the check result normal?

YES :

Check intermediate connectors C-18 and

B-17, and repair if necessary. If intermediate
connectors are normal, check and repair
harness between C-307 (terminal No. 5)
ignition switch connector and B-116
(terminal No. 1) starter connector.

• Check output line for short circuit.

NO :

Repair or replace.

STEP 8: Connector check: B-116 starter
connector

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair or replace.

STEP 9: 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 11 .

NO :

Go to Step 10 .

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

AK305631

1

B-116 (B)

Connector: B-116

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-290

STEP 10: Connector check: C-307 ignition switch
connector

Q: Is the check result normal?

YES :

Check intermediate connectors B-17 and

C-18, and repair if necessary. If intermediate
connectors are normal, check and repair
harness between C-307 (terminal No. 5)
ignition switch connector and B-116
(terminal No. 1) starter connector.

• Check output line for open circuit and

damage.

NO :

Repair or replace.

STEP 11: Connector check: B-115 starter
connector

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Repair or replace.

STEP 12: 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 13 .

NO :

Check and repair harness between B-115

(terminal No. 1) starter connector and
battery.

• Check power supply line for

open/short circuit.

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

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