Mitsubishi Lancer Evolution VI. Manual - part 124

FULL-AUTOMATIC AIR CONDITIONER – 

Troubleshooting

55-48

Inspection procedure 11

Inside/outside air changeover is not possible.

Probable cause

If inside/outside air changeover is not possible even when the inside/outside air
changeover switch is on, the cause is probably a malfunction of the
inside/outside air changeover damper motor.

D

Malfunction of inside/outside air changeover
damper motor

D

Malfunction of inside/outside air changeover
damper

D

Malfunction of connector or harness

D

Malfunction of A/C-ECU

Can an operating sound be heard when the inside/outside air
changeover switch is operated?

NO

Inspection procedure 15 (Refer to P.55-52.)

YES

Inside/outside air changeover damper motor check (Refer to
P.55-59.)

NG

Replace

OK

Measure at the inside/outside air changeover damper motor con-
nector B-36.

D

Disconnect the connector, and measure at the harness
side connector.

D

Outside air select button: ON

D

Voltage between terminal (3) and body earth
OK: 10 V

D

Inside air select button: ON

D

Voltage between terminal (1) and body earth
OK: 10 V

NG

Check the following connector:
B-05

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the inside/outside air changeover
damper motor and the A/C-ECU, and repair if necessary.

NG

Repair

OK

Replace the A/C-ECU.

OK

Check the following connector:
B-36

NG

Repair

OK

Check the trouble symptom.

NG

Inside/outside air changeover damper check

NG

Repair

OK

Replace the A/C-ECU.

FULL-AUTOMATIC AIR CONDITIONER – 

Troubleshooting

55-49

Inspection procedure 12

Defroster function does not operate.

Probable cause

If the defroster function does not operate when the defroster switch is turned
on, the cause is probably a malfunction of the A/C or of the air outlet port
changeover circuit.

D

Malfunction of air conditioner drive system

D

Malfunction of air outlet changeover damper drive
system

D

Malfunction of connector or harness

D

Malfunction of A/C-ECU

Can an operating sound be heard when the defroster switch is
operated?

NO

Inspection procedure 15 (Refer to P.55-52.)

YES

Does the A/C operate?

NO

Inspection procedure 2 (Refer to P.55-43.)

YES

Can the air outlet port be changed over?

NO

Inspection procedure 10 (Refer to P.55-47.)

YES

Air outlet changeover damper (for defroster) check

NG

Repair

OK

Replace the A/C-ECU.

FULL-AUTOMATIC AIR CONDITIONER – 

Troubleshooting

55-50

Inspection procedure 13

Condenser fan does not operate.

Probable cause

If the condenser fan does not turn when the A/C is ON, the cause is probably
a malfunction of the condenser fan motor activation circuit. In this case, reduced
cooling performance will be caused if the vehicle is not running.

D

Malfunction of condenser fan motor

D

Malfunction of condenser fan motor relay (HI, LO)

D

Malfunction of wiring harness or connector

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the condenser fan motor relay (LO)
and the condenser fan motor, and repair if necessary.

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the condenser fan motor relay (LO)
and the body earth, and repair if necessary.

OK

Measure at the condenser fan motor relay (LO) connector A-113X.

D

Disconnect the connector.

(1) Continuity between terminal (4) and body earth

OK: Continuity

(2) Voltage between terminal (2) and body earth

OK: System voltage

(3) Voltage between terminal (1) and body earth

OK: System voltage

(1) NG

Check the following connector:
A-113X

Condenser fan motor check (Refer to P.55-29.)

NG

Replace

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the condenser fan motor relay (LO)
and the A/C-ECU, and repair if necessary.

(2) NG

Check the following connector:
A-113X

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the condenser fan motor relay (LO)
and the fusible link 

2

, and repair if necessary.

(3) NG

Check the following connector:
A-113X

OK

Continued to the next page

OK

Measure at the condenser fan motor connector A-99.

D

Disconnect the connector, and measure at the harness
side connector.

D

Connect the connector A-113X terminal (2) to the battery.

D

Voltage between terminal (2) and body earth
OK: System voltage

NG

Check the following connector:
A-113X

OK

Condenser fan motor relay check (Refer to P.55-14.)

NG

Replace

FULL-AUTOMATIC AIR CONDITIONER – 

Troubleshooting

55-51

NG

Repair

OK

Check the trouble symptom.

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the condenser fan motor relay (HI)
and the engine-ECU, and repair if necessary.

Measure at the radiator fan motor relay (HI) connector A-114X.

D

Disconnect the connector.

(1) Continuity between 4-B-59 and connector terminal (20)

OK: Continuity

(2) Voltage between terminal (2) and body earth (Ignition

switch: ON)
OK: System voltage

(3) Voltage between terminal (1) and body earth

OK: System voltage

(1) NG

Check the following connectors:
A-114X, A-28, B-59

From the previous page

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the condenser fan motor relay (HI)
and the ignition switch, and repair if necessary.

(2) NG

Check the following connector:
A-114X

NG

Repair

OK

Check the trouble symptom.

NG

Check the harness between the condenser fan motor relay (HI)
and the fusible link 

2

, and repair if necessary.

(3) NG

Check the following connector:
A-114X

OK

Measure at the condenser fan motor connector A-99.

D

Disconnect the connector, and measure at the harness
side connector.

D

Connect the terminal B-59 to the earth.

D

Voltage between terminal (1) and body earth (Ignition switch:
ON)
OK: System voltage

NO

Check the following connector:
A-112X

NG

Check the harness between the condenser fan motor relay (HI)
and the condenser fan motor, and repair if necessary.

Inspection procedure 14

Rear defogger does not operate.

Probable cause

If the rear defogger does not operate when the rear defogger switch is turned
on (timer operates for 20 minutes), the cause is probably a malfunction of the
A/C-ECU power supply system (earth).

D

Malfunction of connector or harness

D

Malfunction of A/C-ECU

Can an operating sound be heard when the rear defogger switch
is operated?

NO

Inspection procedure 15 (Refer to P.55-52.)

YES

Replace the A/C-ECU.