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

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-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

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-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

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

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

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

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58

50

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