Mitsubishi Grandis. Manual — part 730

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-171

STEP 8. Check harness between B-114 (terminal
No. 2) camshaft position sensor connector and
C-112 (terminal No. 71) engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector.

• Check output line for short circuit.

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair.

STEP 9. 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 10. Perform resistance measurement at
B-114 camshaft position sensor connector.

• Disconnect connector, and measure at harness

side.

• Resistance between terminal No. 1 and earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 13 .

NO :

Go to Step 11 .

STEP 11. Connector check: C-112 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Repair or replace.

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-172

STEP 12. Check harness between B-114 (terminal
No. 1) camshaft position sensor connector and
C-112 (terminal No. 88) engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector.

NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair.

STEP 13. Perform output wave pattern
measurement at B-114 camshaft position sensor
connector (Using an oscilloscope).

• Use special tool test harness (MB991709) to

connect connector, and measure at pick-up
harness.

• Engine: Idling

• Transmission: Neutral <M/T> or P range <A/T>

• Voltage between terminal No. 2 and earth.

OK: Waveforms should be displayed on
Inspection procedure using an oscilloscope
(Refer to

P.13A-378

), its maximum value

should be 4.8 V or more, and its minimum
value should be 0.6 V or less with no noise in
waveform.

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Go to Step 14 .

STEP 14. Connector check: B-15X engine control
relay connector.

Q: Is the check result normal?

YES :

Go to Step 15 .

NO :

Repair or replace.

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

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-173

STEP 15. Check harness between B-114 (terminal
No. 3) camshaft position sensor connector and
B-15X (terminal No. 1) engine control relay
connector.

NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 16 .

NO :

Repair.

STEP 16. Connector check: C-112 engine-ECU
<M/T> connectors or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 17 .

NO :

Repair or replace.

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-174

STEP 17. Check harness between B-114 (terminal
No. 2) camshaft position sensor connector and
C-112 (terminal No. 71) engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector.

• Check output line for damage.

Q: Is the check result normal?

YES :

Go to Step 18 .

NO :

Repair.

STEP 18. Check harness between B-114 (terminal
No. 1) camshaft position sensor connector and
C-112 (terminal No. 88) engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector.

NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.

• Check earthing line for damage.

Q: Is the check result normal?

YES :

Go to Step 19 .

NO :

Repair.

STEP 19. Check camshaft position sensing
cylinder.

Q: Is the check result normal?

YES :

Go to Step 20 .

NO :

Replace camshaft position sensing cylinder.

STEP 20. Check the trouble symptoms.

Q: Does trouble symptom persist?

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304269

1

2

3

AC

Connector: B-114

B-114 (B)

Harness
side connector

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>