Mitsubishi Lancer (4A9 engine). Manual — part 303

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55A-93

3. Start the engine and then turn ON the air

conditioner switch.

AC208297

0

1

2

3

1

2

3

4

5

AB

Output voltage

(V)

Refrigerant pressure (MPa)

4. At this time, check to see that the voltage of the A/

C pressure sensor connector terminal No. 2
reflects the specifications of the figure.
NOTE:

.

•

The allowance shall be defined as

±

5%.

•

The A/C pressure sensor is incorporated in the
discharge flexible hose, and the high-pressure
service valve is incorporated in liquid pipe B.
Therefore, the pressure at the A/C pressure
sensor is 0.1 to 0.3 MPa higher than that at the
gauge manifold.

RELAY CHECK

M1552008801539

BLOWER RELAY CONTINUITY CHECK

AC605627

AC700765

AC701458

4

1

3

2

AB

Blower relay

Blower relay

<LHD>

<RHD>

Battery voltage Checking

terminal

Normal
condition

Not applied

3

− 4

No continuity

• Connect

terminal 1 to
the positive
battery
terminal

• Connect

terminal 2 to
the negative
battery
terminal

Continuity
exists (2

Ω or

less)

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55A-94

A/C COMPRESSOR RELAY CONTINUITY
CHECK

AC700764

AC701455

A/C compressor relay

3

1

4

2

AK

Battery voltage Checking

terminal

Normal
condition

Not applied

3

− 4

No continuity

• Connect

terminal 2 to
the positive
battery
terminal

• Connect

terminal 1 to
the negative
battery
terminal

Continuity
exists (2

Ω or

less)

PTC HEATER RELAY 1 CONTINUITY
CHECK <VEHICLES WITH PTC HEATER>

AC700764

AC701455

AF

2

3

4

1

PTC heater relay 1

Battery voltage Checking

terminal

Normal
condition

Not applied

2

− 4

No continuity

• Connect

terminal 3 to
the positive
battery
terminal

• Connect

terminal 1 to
the negative
battery
terminal

Continuity
exists (2

Ω or

less)

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55A-95

PTC HEATER RELAY 2 CONTINUITY
CHECK <VEHICLES WITH PTC HEATER>

AC700764

AC701455

AG

4

3

2

1

PTC heater relay 2

Battery voltage Checking

terminal

Normal
condition

Not applied

2

− 4

No continuity

• Connect

terminal 3 to
the positive
battery
terminal

• Connect

terminal 1 to
the negative
battery
terminal

Continuity
exists (2

Ω or

less)

PTC HEATER RELAY 3 CONTINUITY
CHECK <DISEL ENGINE>

AC700764

AC701455

PTC heater relay 3

4

1

3

2

AH

Battery voltage Checking

terminal

Normal
condition

Not applied

3

− 4

No continuity

• Connect

terminal 1 to
the positive
battery
terminal

• Connect

terminal 2 to
the negative
battery
terminal

Continuity
exists (2

Ω or

less)

IDLE-UP INSPECTION

M1552001602054

1. Before inspection, set the vehicle to the pre-

inspection condition.

2. Check that the idling speed is within the standard

value range.

Standard value:

<1600>

750

± 50 r/min

<1800 Petrol>

650

± 50 r/min (M/T)

700

± 50 r/min (CVT)

HEATER CONTROL UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55A-96

<1800 Diesel>

650

± 50 r/min

<2000>

700

± 50 r/min

NOTE: The idling speed is controlled by the ISC
system automatically, so does not require adjust-
ment.

3. Operate the air conditioner by turning on the A/C

switch. Then check that the idling speed is within
the standard value range.

Standard value:

<1800 Petrol, 2000>

750

± 100 r/min

<1600>

850

± 100 r/min

<1800 Diesel>

900

± 100 r/min

REPLACE THE CLEAN AIR FILTER

M1552020600369

AC611715AB

1. Remove the glove box (Refer to GROUP 52A

−

Instrumental Panel, ).

2. Loosen the two lugs as shown to replace the

clean air filter.

3. Install the glove box.

HEATER CONTROL UNIT

REMOVAL AND INSTALLATION

M1554014700523

AC608191AD

1

2

Removal steps

1.

Instrument panel centre lower
(Refer to GROUP 52A, Instrument
panel centre panel )

2.

Heater control panel <Vehicles
without A/C> or A/C control panel
<Vehicles with A/C>