Mitsubishi Lancer. Manual - part 262

 

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Mitsubishi Lancer. Manual - part 262

 

 

AC303555AB

Connector: C-123 <M/T>, C-122 <A/T>

C-123 <M/T>
or
C-122 <A/T>

C-123 <M/T>

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

C-122 <A/T>

TROUBLESHOOTING

ENGINE COOLING

14-14

Q: Are these connectors in good condition?

YES : 

Go to Step 21 .

NO : 

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

STEP 21. Check the harness wire between 
cooling fan motor drive control unit connector 
A-18 terminal 2 and engine-ECU connector C-123 
terminal 21 <M/T> or engine-A/T-ECU connector 
C-122 terminal 18 <A/T>.

AC100293

A-18

3

2

1

Connector: A-18

AD

AC303555AB

Connector: C-123 <M/T>, C-122 <A/T>

C-123 <M/T>
or
C-122 <A/T>

C-123 <M/T>

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

C-122 <A/T>

Q: Are these harness wires in good condition?

YES : 

Go to Step 22 .

NO : 

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

TROUBLESHOOTING

ENGINE COOLING

14-15

STEP 22. Check the cooling fan motor drive 
control unit.

AC303555AB

Connector: C-123 <M/T>, C-122 <A/T>

C-123 <M/T>
or
C-122 <A/T>

C-123 <M/T>

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

C-122 <A/T>

(1) Disconnect engine-ECU connector C-123 <M/T> 

or engine-A/T-ECU connector C-122 <A/T>.

AC303559

C-122 connector <A/T>
(Harness side connector: ECU side view)

AB

C-123 connector <M/T>
(Harness side connector: ECU side view)

(2) Pull out connector terminal pin 21 <M/T> or 18 

<A/T> to disconnect connector.

(3) Reconnect the connector with connector terminal 

pin still removed.

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

(5) Check for the cooling fan operation.

• The cooling fan rotates. (with connector termi-

nal pin 21 <M/T> or 18 <A/T> disconnected)

• The cooling fan stops. (When connector ter-

minal pin 21 <M/T> or 18 <A/T>  is connected 
to the body earth.)

(6) Turn the ignition switch to the "OFF" position.
(7) Disconnect engine-ECU connector C-123 <M/T> 

or engine-A/T-ECU connector C-122 <A/T>, and 
push in connector terminal pin 21 <M/T> or 18 
<A/T> to disconnect connector.

(8) Reconnect the connector with connector terminal 

pin still installed.

Q: Does the cooling fan rotate?  And when the 

connector terminal pin is connected to the body 
earth, does the cooling fan stop?
YES : 

Go to Step 23 .

NO : 

Replace the cooling fan motor drive control 
unit (Refer to 

P.14-33

) <4G1> (Refer to 

P.14-35

) <4G6>. Then go to Step 24 .

STEP 23. M.U.T.-II/III self-diag code
Check if an MPI system self-diag code is set. (Refer 
to GROUP 13A - Trouble shooting 

P.13A-9

) <4G1> 

or (Refer to GROUP 13B - Trouble shooting 

P.13B-9

) <4G6>.

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to GROUP 13A - Trouble shooting 

P.13A-15

) <4G1> or Inspection chart for 

diagnosis code (Refer to GROUP 13B - 
Trouble shooting 

P.13B-15

) <4G6>.

NO : 

Replace the engine-ECU <M/T> or 
engine-A/T-ECU <A/T> (Refer to GROUP 
13A 

P.13A-384

). Then go to Step 24 .

STEP 24. Check the symptoms.

Q: Does the cooling fan motor (L.H.) and the cooling 

fan motor (R.H.) <4G1 (Vehicles with A/C)> or A/C 
condenser fan motor <4G6> operate correctly?
YES : 

This symptoms is complete.

NO : 

Return to Step 1 .

TROUBLESHOOTING

ENGINE COOLING

14-16

INSPECTION PROCEDURE 2: Cooling Fan (L.H.) and Cooling Fan (R.H.) <4G1 (Vehicles with A/C)> or 
A/C Condenser Fan <4G6> do not Change Speed or Stop

COOLING FAN (L.H.) AND COOLING FAN 
(R.H.) OR A/C CONDENSER FAN DRIVE 
CIRCUIT

Refer to 

P.14-6

.

CIRCUIT OPERATION

Refer to 

P.14-6

.

TECHNICAL DESCRIPTION

• If the communication line wiring harness between 

the cooling fan motor drive control unit and the 
engine-ECU <M/T> or the engine-A/T-ECU 
<A/T> is open, the cooling fan motor (L.H.) and 
the cooling fan motor (R.H.) <4G1 (Vehicles with 
A/C)>, or the A/C condenser fan motor <4G6> 
rotate to prevent the engine from overheating.

• If the system voltage is continuously supplied to 

the cooling fan motor drive control unit by a fan 
motor relay malfunction and a short circuit on the 
cooling fan motor drive control unit power supply 
wiring harness, the cooling fan motor (L.H.) and 
the cooling fan motor (R.H.) <4G1 (Vehicles with 
A/C)>, or the A/C condenser fan motor <4G6> 
rotate.

• The cause could also be a malfunction of the 

cooling fan motor (L.H.). <Vehicles without A/C>

• 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 

cooling fan motor drive control unit or the 
engine-ECU <M/T> or engine-A/T-ECU <A/T>.

TROUBLESHOOTING HINTS

• Malfunction of fan control relay

• Malfunction of cooling fan motor (L.H.) <Vehicles 

without A/C>

• Malfunction of cooling fan motor drive control unit

• Malfunction of engine-ECU <M/T> or 

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

• Damaged wiring harness or connector

DIAGNOSIS

STEP 1. Check the fan control relay.
Refer to 

P.14-23

.

Q: Is the fan control relay in good condition?

YES : 

Go to Step 2 .

NO : 

Replace the fan control relay. Then go to 
Step 8 .

STEP 2. Check the fan control relay connector 
A-09X.

AC303510

AB

Fan control relay

Relay box

Connector: A-09X

A-09X

Q: Is the connector in good condition?

YES : 

Go to Step 3 .

NO : 

Repair the connector or replace the relay 
box. Then go to Step 8 .

STEP 3. Check the harness wire between fan 
control relay connector A-09X terminal 2 and 
cooling fan motor drive control unit connector 
A-18 terminal 3.

AC303510

AB

Fan control relay

Relay box

Connector: A-09X

A-09X

AC100293

A-18

3

2

1

Connector: A-18

AD

TROUBLESHOOTING

ENGINE COOLING

14-17

Q: Is the harness wire in good condition?

YES : 

Go to Step 4 .

NO : 

Repair the damaged harness wire. Then go 
to Step 8 .

STEP 4. Check the cooling fan motor drive 
control unit connector A-18, intermediate 
connector A-13 <L.H. drive vehicles> or C-111 
<R.H. drive vehicles> and engine-ECU connector 
C-123 <M/T> or engine-A/T-ECU connector C-122 
<A/T>.

AC100293

A-18

3

2

1

Connector: A-18

AD

AC303526

Connector: A-13 <L.H. drive vehicles>

AB

A-13

A-13

AC303527

Connector: C-111 <R.H. drive vehicles>

AB

C-111

C-111

6

1

5

12

11

7

9

8

10

2 3

4

AC303555AB

Connector: C-123 <M/T>, C-122 <A/T>

C-123 <M/T>
or
C-122 <A/T>

C-123 <M/T>

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

C-122 <A/T>

Q: Are these connectors in good condition?

YES : 

Go to Step 5 .

NO : 

Repair or replace the connector. Then go to 
Step 8 .

 

 

 

 

 

 

 

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