Mitsubishi Grandis. Manual — part 727

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-159

STEP 4. Perform voltage measurement at C-112
engine-ECU connector.

• Measure engine-ECU <M/T> or engine-A/T-ECU

<A/T> terminal voltage.

• Disconnect B-121 crank angle sensor

intermediate connector.

• Ignition switch: ON

• Voltage between terminal No. 70 and earth.

OK: 4.9

− 5.1 V

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Go to Step 6 .

STEP 5. Connector check: C-112 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Check and repair harness between B-121

(terminal No. 2) crank angle sensor
intermediate connector and C-112 (terminal
No. 70) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for open circuit.

NO :

Repair or replace.

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

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>

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

Harness
side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-160

STEP 6. 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 7 .

NO :

Repair or replace.

STEP 7. Check harness between B-121 (terminal
No. 2) crank angle sensor intermediate connector
and C-112 (terminal No. 70) 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 8 .

NO :

Repair.

STEP 8. MUT-III data list

• Refer to Data List Reference Table

P.13A-363

.

a. Item 22: Crank angle sensor

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NO :

Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

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-161

STEP 9. Perform voltage measurement at B-121
crank angle sensor intermediate connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• 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 .

STEP 10. Connector check: B-15X engine control
relay connector

Q: Is the check result normal?

YES :

Check intermediate connector C-116, and

repair if necessary. If intermediate
connector is normal, check and repair
harness between B-121 (terminal No. 1)
crank angle sensor intermediate connector
and B-15X (terminal No. 1) engine control
relay connector.

• Check power supply line for

open/short circuit.

NO :

Repair or replace.

STEP 11. Perform resistance measurement at
B-121 crank angle sensor intermediate
connector.

• Disconnect connector, and measure at harness

side.

• Resistance between terminal No. 3 and earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 14 .

NO :

Go to Step 12 .

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

Harness
side connector

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

Harness
side connector

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

Harness
side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-162

STEP 12. 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 13 .

NO :

Repair or replace.

STEP 13. Check harness between B-121 (terminal
No. 3) crank angle sensor intermediate 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 8 .

NO :

Repair.

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK304267

1

2

3

B-121 (GR)

AC

Connector: B-121

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>