Mitsubishi Grandis. Manual — part 772

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-339

STEP 22. Check harness between C-214 (terminal
No. 2) fuel pump relay (2) connector and C-110
(terminal No. 16) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

NOTE: Before checking harness, check intermediate
connectors C-18 and C-205, and repair if necessary.

• Check earthing line for damage.

Q: Is the check result normal?

YES :

Replace fuel pump.

NO :

Repair.

AK305634

2 1

3

4

AB

Connector: C-214

C-214

Harness side
connector

C-214

Relay box’s
triangle marks

<L.H. drive vehicles>

<R.H. drive vehicles>

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-340

Inspection Procedure 24: Fan Control Relay System

OPERATION

• The battery voltage is applied to the fan control

relay (terminal No. 1) from the engine control

relay (terminal No. 1) and is earthed to the
vehicle body from the fan control relay (terminal
No. 3).

AK305580

1

2

3

4

1

3

2

4

1 2 3

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

AB

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

Fusible link (26)

W

W

J/C (4)
C-116

9

20A

Fan control
circuit

Engine control relay

W-G

L-W

L-W

L-W

A-13X

W-G

W-G

R-W

R-W

R-W

Engine control system

Fusible link (2)

4

3

1

2

Fan control relay

Fan controller

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

4

3

W

3

2

1

5

B

B-15X

11

8

1

A-16

2

A-16

17

8

2

A-16

A-25

A-26

(MU802322)

C-110

(MU803802)

Fan control relay circuit

To engine-ECU <M/T> or
engine-A/T-ECU <A/T>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-341

• The battery voltage is applied to the fan control

relay (terminal No. 4).

• When the fan control relay is in ON position, the

battery voltage is supplied to the fan controller
(terminal No. 1) from the fan control relay
(terminal No. 2).

FUNCTION

• When the engine control relay is in ON position,

the fan control relay is also simultaneously placed
in "ON" position. Accordingly, the battery voltage
is supplied to the fan controller.

PROBABLE CAUSE

• Failed fan control relay

• Failed fan controller

• Failed radiator fan motor

• Failed condenser fan motor

• Open/short circuit in fan control relay circuit or

loose connector contact

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-13X fan control
relay connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace.

STEP 2. Check fan control relay.

• Check fan control relay (Refer to GROUP 14 −

On

−vehicle Service − Fan Control Relay

Continuity Check

P.14-19

).

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace fan control relay.

STEP 3. Perform resistance measurement at
A-13X fan control relay connector.

• Remove relay and measure at relay box side.

• Resistance between terminal No. 1 and earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Go to Step 4 .

STEP 4. Connector check: A-25 earth connector.

Q: Is the check result normal?

YES :

Check and repair harness between A-13X

(terminal No. 1) fan control relay connector
and A-25 (terminal No. 5) earth connector.

• Check earthing line for open circuit

and damage.

NO :

Repair or replace.

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

3

2 1

6

5 4

AK305636AB

A-25 (GR)

Connector: A-25

Harness side connector

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-342

STEP 5. Perform voltage measurement at A-13X
fan control relay connector.

• Remove relay and measure at relay box side.

• Ignition switch: ON

• Voltage between terminal No. 3 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 6 .

STEP 6. Connector check: B-15X engine control
relay connector

Q: Is the check result normal?

YES :

Check intermediate connectors A-16 and

C-116, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between B-15X (terminal
No. 1) engine control relay connector and
A-13X (terminal No. 3) fan control relay
connector.

• Check power supply line for

open/short circuit.

NO :

Repair or replace.

STEP 7. Perform voltage measurement at A-13X
fan control relay connector.

• Remove relay, and measure at relay box side.

• Voltage between terminal No. 4 and earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Check and repair harness between battery

and A-13X (terminal No. 4) fan control relay
connector.

• Check power supply line for

open/short circuit.

STEP 8. Connector check: A-26 fan controller
connector

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair or replace.

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

AK301004

3

1

2

4

AC

Connector: A-13X

A-13X

Harness side
connector

AK300999

1

2

3

AC

Harness side connector

Connector: A-26

A-26 (GR)