Mitsubishi Grandis. Manual — part 808

TROUBLESHOOTING

ENGINE COOLING

14-5

TECHNICAL DESCRIPTION

• The cause could be a malfunction of the fan

controller power supply or earth circuit.

• If the communication line wiring harness between

the fan controller and the engine-ECU <M/T> or
engine-A/T-ECU <A/T> is short-circuited to earth,
the radiator fan motor and the condenser fan
motor will not rotate.

• The cause could also be a malfunction of input

signal from the A/C switch, the water temperature
sensor unit and the vehicle speed sensor <M/T>
or the output shaft speed sensor <A/T> to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.

• The cause could also be a malfunction of the fan

controller or the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

TROUBLESHOOTING HINTS

• Malfunction of fusible link No.2

• Malfunction of fan control relay

• Malfunction of cooling fan motor and fan

controller

• Malfunction of engine-ECU <M/T> or

engine-A/T-ECU <A/T>

• Damaged wiring harness or connector

DIAGNOSIS

STEP 1. Measure the power supply voltage at fan
controller connector A-26.

(1) Disconnect fan controller connector A-26 and

measure wiring harness side connector.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between fan controller

connector A-26 terminal 3 and body earth.

• The voltage should measure system voltage.

(4) Turn the ignition switch to the "LOCK" (OFF)

position.

(5) Connect fan controller connector A-26.

Q: Is the measured voltage system voltage?

YES :

Go to Step 17.

NO :

Go to Step 2.

STEP 2. Check the fan controller connector A-26.

Q: Is the connector in good condition?

YES :

Go to Step 3.

NO :

Repair or replace the connector. Then go to
Step 24.

STEP 3. Check the fusible link No.2.

Q: Is the fusible link No.2 in good condition?

AC302093

1

2

3

AG

A-26

Connector: A-26

3

2

1

AC201418

Connector A-26
(Component side)

AH

AC302093

1

2

3

AG

A-26

Connector: A-26

AC311245AB

Fusible link
No.2

Relay box

TROUBLESHOOTING

ENGINE COOLING

14-6

YES :

Go to Step 4.

NO :

Replace the fusible link No.2. Then go to
Step 24.

STEP 4. Measure the power supply voltage at fan
control relay connector A-13X.

(1) Disconnect fan control relay connector A-13X

(remove the fan control relay) and measure relay
box side connector.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between fan control relay

connector A-13X terminal 4 and body earth.

• The voltage should measure system voltage.

(4) Turn the ignition switch to the "LOCK" (OFF)

position.

(5) Connect fan control relay connector A-13X

(install the fan control relay).

Q: Is the measured voltage system voltage?

YES :

Go to Step 7.

NO :

Go to Step 5.

STEP 5. Check the fan control relay connector
A-13X.

Q: Is the connector in good condition?

YES :

Go to Step 6.

NO :

Repair the connector or replace the relay
box. Then go to Step 24.

STEP 6. Check the harness wire between fusible
link No.2 and fan control relay connector A-13X
terminal 4.

Q: Is the harness wire in good condition?

YES :

An intermittent malfunction is suspected

(Refer to GROUP 00 - How to use
troubleshooting

P.00-5

).

NO :

Repair the damaged harness wire. Then go
to Step 24.

STEP 7. Check the fan control relay.

Refer to

P.14-19

.

Q: Is the fan control relay in good condition?

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC303511 AE

A-13X Connector
(Relay box side)

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311245AB

Fusible link
No.2

Relay box

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

TROUBLESHOOTING

ENGINE COOLING

14-7

YES :

Go to Step 8.

NO :

Replace the fan control relay. Then go to
Step 24.

STEP 8. Check the fan control relay connector
A-13X.

Q: Is the connector in good condition?

YES :

Go to Step 9.

NO :

Repair the connector or replace the relay
box. Then go to Step 24.

STEP 9. Check the harness wire between fan
control relay connector A-13X terminal 2 and fan
controller connector A-26 terminal 3.

Q: Is the harness wire in good condition?

YES :

Go to Step 10.

NO :

Repair the damaged harness wire. Then go
to Step 24.

STEP 10. Measure the terminal voltage at fan
control relay connector A-13X.

(1) Disconnect fan control relay connector A-13X

(remove the fan control relay) and measure relay
box side connector.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between fan control relay

connector A-13X terminal 3 and body earth.

• The voltage should measure system voltage.

(4) Turn the ignition switch to the "LOCK" (OFF)

position.

(5) Connect fan control relay connector A-13X

(install the fan control relay).

Q: Is the measured voltage system voltage?

YES :

Go to Step 13.

NO :

Go to Step 11.

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC302093

1

2

3

AG

A-26

Connector: A-26

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311246 AB

A-13X Connector
(Relay box side)

TROUBLESHOOTING

ENGINE COOLING

14-8

STEP 11. Check the J/C No.2 C-116, intermediate
connector A-16 and fan control relay connector
A-13X.

Q: Are there connectors in good condition?

YES :

Go to Step 12.

NO :

Repair or replace the connector. Then go to
Step 24.

STEP 12. Check the harness wire between J/C
No.2 C-116 terminal 8 and fan control relay
connector A-13X terminal 3.

Q: Are these harness wires in good condition?

YES :

An intermittent malfunction is suspected

(Refer to GROUP 00 - How to use
troubleshooting

P.00-5

).

NO :

Repair the damaged harness wire. Then go
to Step 24.

AC311249AB

Connector: C-116 <L.H. drive vehicles>

C-116

C-116

AC311250AB

Connector: C-116 <R.H. drive vehicles>

C-116

C-116

AC311248AB

Connector: A-16

A-16

A-16

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X

AC311249AB

Connector: C-116 <L.H. drive vehicles>

C-116

C-116

AC311250AB

Connector: C-116 <R.H. drive vehicles>

C-116

C-116

AC311245AC

Fan control relay

Relay box

Connector: A-13X

A-13X