Mitsubishi Lancer (4A9 engine). Manual - part 306

AMBIENT TEMPERATURE SENSOR

HEATER, AIR CONDITIONER AND VENTILATION

55A-105

AMBIENT TEMPERATURE SENSOR

REMOVAL AND INSTALLATION

M1554003400603

AC609030

1

AE

Removal steps 

•

Air cleaner intake duct (Refer to 
GROUP 15, Air Cleaner )

•

Headlamp support panel cover 
(Refer to GROUP 51, Front 
Bumper and Radiator Grille )

1.

Ambient temperature sensor

INSPECTION

M1552014304123

AMBIENT TEMPERATURE SENSOR 
CHECK

AC508067AC

10

7

6
5

9
8

4
3
2
1
0

10

20

30

40

-10

0

RESISTANCE

TEMPERATURE (˚C)

(k )

Check to see that the resistance shown in the graph 
is almost satisfied when measuring the resistance 
between the terminals under two or more different 
temperature conditions.

A/C-ECU

HEATER, AIR CONDITIONER AND VENTILATION

55A-106

A/C-ECU

REMOVAL AND INSTALLATION

M1554016600447

Pre-removal and Post-installation Operation
• Glove Box and Bottom Cover Assembly (passenger's 

side) Removal and Installation (Refer to GROUP 52A 

− 

Instrument Panel ).

• Foot duct Removal and Installation (Refer to ).

AC900349

Heater control unit 
<Vehicles without A/C> or 
A/C-ECU <Vehicles with A/C>

AB

PTC HEATER <Vehicles with PTC heater>

HEATER, AIR CONDITIONER AND VENTILATION

55A-107

PTC HEATER <Vehicles with PTC heater>

REMOVAL AND INSTALLATION

M1554023000179

WARNING

•

Before removing the front seat assembly, refer to GROUP 52B, Service Precautions  and 
Knee air bag module .

•

AC612223AB

1

Removal steps 

•

Floor console, Floor console side 
cover (Refer to GROUP 52A 

− 

Floor console assembly ).

•

Bottom cover (passenger side), 
Glove box side panel, Glove box 
damper, Glove box, Glove box 
cover (Refer to GROUP 52A 

− 

Glove box ).

•

Instrument panel air outlet garnish 
lower (RH), Instrument centre 
panel, Instrument panel console 
box, Instrument panel under cover 
(Refer to GROUP 52A 

− Instrument 

centre panel ).

•

Instrument panel cover lower 
<Vehicle with Instrument panel 
cover lower>, Instrument panel 
lower (Refer to GROUP 52A 

− 

Instrument centre panel ).

•

Foot duct LH, Foot duct RH (Refer 
to ).

•

Knee air bag module (Refer to 
GROUP 52B 

− Knee air bag 

module ).

•

Radio and CD player assembly 
(Refer to GROUP 54A 

− Radio and 

CD player ).

<<

A

>>

1.

PTC heater

Never attempt to disassemble or repair the PTC sensor. If faulty, replace it with new 
one(s).

REMOVAL SERVICE POINT

<<A>> PTC HEATER REMOVAL
Remove the PTC heater as described below.

Removal steps (Continued)

AC700312

Foot duct centre

AB

Combination meter

PTC HEATER <Vehicles with PTC heater>

HEATER, AIR CONDITIONER AND VENTILATION

55A-108

1. Slide the foot duct centre so that a precision 

screwdriver can be inserted from the upper side of 
the PTC heater connector.

AC700311

PTC heater 
connector

Precision screwdriver

AB

2. Insert a precision screwdriver from the upper side 

of the PTC heater connector, and disconnect the 
connector.

3. Remove the PTC heater screws.

AC700313

AB

Harness clamp

Steering column 
lower cover

4. Remove the harness clamp shown in the figure, 

and pull out the PTC heater.

INSPECTION

M1552014304316

PTC HEATER CHECK

AC701303

<C-53>

<C-52>

AB

Tester connection 

Specified 
condition

C-52 terminal No. 1 

− C-53 

terminal No. 1

Continuity exists

C-52 terminal No. 1 

− C-53 

terminal No. 2

Continuity exists

C-52 terminal No. 2 

− C-53 

terminal No. 2

Continuity exists

C-52 terminal No. 3 

− C-53 

terminal No. 2

Continuity exists