Mitsubishi Grandis. Manual — part 744

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-227

STEP 4. 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-07 (terminal No. 1) oil
control valve connector and B-15X (terminal
No. 1) engine control relay connector.

• Check power line for open/short

circuit.

NO :

Repair or replace.

STEP 5. Perform voltage measurement at C-113
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 95 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 6 .

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300966

1

2

AC

B-07 (B)

Connector: B-07

Harness side connector

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

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Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-228

STEP 6. Connector check: C-113 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-07

(terminal No. 2) oil control valve connector
and C-113 (terminal No. 95) engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector.

• Check output line for open/short

circuit.

NO :

Repair or replace.

STEP 7. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Repair or replace.

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

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Harness side connector

AK300966

1

2

AC

B-07 (B)

Connector: B-07

Harness side connector

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

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Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-229

STEP 8. Check harness between B-07 (terminal
No. 2) oil control valve connector and C-113
(terminal No. 95) 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 9 .

NO :

Repair.

STEP 9. Check harness between B-07 (terminal
No. 1) oil control valve connector and B-15X
(terminal No. 1) engine control relay connector.

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 10 .

NO :

Repair.

STEP 10. 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

).

Code No. P1602: Communication Malfunction (between Engine-ECU <M/T> or Engine-A/T-ECU <A/T>
Main Processor and System LSI)

FUNCTION

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

checks the communication status for abnormal
conditions.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is ON position.

AK300966

1

2

AC

B-07 (B)

Connector: B-07

Harness side connector

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

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Harness side connector

AK300966

1

2

AC

B-07 (B)

Connector: B-07

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-230

Judgement Criteria

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

detects an error in communication with the
throttle actuator control module for 0.07 second.

PROBALE CAUSE

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS

STEP 1. 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

).