Mitsubishi Lancer (4A9 engine). Manual — part 280

55A-1

GROUP 55A

HEATER, AIR

CONDITIONER AND

VENTILATION

CONTENTS

GENERAL INFORMATION . . . . . . . .

55A-4

SERVICE SPECIFICATION(S) . . . . .

55A-5

LUBRICANT(S) . . . . . . . . . . . . . . . . .

55A-5

SPECIAL TOOL(S) . . . . . . . . . . . . . .

55A-6

TROUBLESHOOTING . . . . . . . . . . . .

55A-8

DIAGNOSIS TROUBLESHOOTING FLOW

55A-8

DIAGNOSIS FUNCTION. . . . . . . . . . . . . . .

55A-8

DIAGNOSIS CODE CHART . . . . . . . . . . . .

55A-9

DIAGNOSIS CODE PROCEDURES . . . . .

55A-11

B1034 Ambient Temperature Sensor System

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-11

B1031 Air Thermo Sensor System <Vehicles without A/
C> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-12

B1031 Air Thermo Sensor System <Vehicles with A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-13

B1000 Control Panel Communication Error <Vehicles
without A/C> . . . . . . . . . . . . . . . . . . . . . . . .

55A-14

B1000 Control Panel Communication Error <Vehicles
with A/C>. . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-15

B1018 Temperature Control Dial SW Error <Vehicles
without A/C> . . . . . . . . . . . . . . . . . . . . . . . .

55A-17

B1018 Temperature Control Dial SW Error <Vehicles
with A/C>. . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-18

B1003 Mode Dial SW Error <Vehicles without A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-19

B1003 Mode Dial SW Error <Vehicles with A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-20

B1021 Fan Dial SW Error <Vehicles without A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-21

B1021 Fan Dial SW Error <Vehicles with A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-22

B1079 Refrigerant Leaks. . . . . . . . . . . . . . .

55A-23

B2214 Control Panel Failure <Vehicles without A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-24

B2214 Control Panel Failure <Vehicles with A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-25

U1415 COOLING NOT COMPLETED . . . .

55A-26

U0019 Bus Off (CAN-B) . . . . . . . . . . . . . . .

55A-27

U0141 ETACS CAN Time-out . . . . . . . . . . .

55A-28

U0151 SRS CAN Time-out . . . . . . . . . . . . .

55A-29

U0155 Meter CAN Time-out . . . . . . . . . . . .

55A-30

U0168 WCM CAN Time-out . . . . . . . . . . . .

55A-32

U0184 Audio CAN Time-out . . . . . . . . . . . .

55A-33

SYMPTOM CHART <Vehicles without A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-34

SYMPTOM PROCEDURES <Vehicles without A/C>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-35

COMMUNICATION WITH THE M.U.T.-III IS NOT
POSSIBLE. . . . . . . . . . . . . . . . . . . . . . . . . .

55A-35

BLOWER MOTOR DOES NOT OPERATE.

55A-36

BLOWER AIR AMOUNT CANNOT BE CHANGED.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-39

INSIDE/OUTSIDE AIR CHANGEOVER IS NOT
POSSIBLE. . . . . . . . . . . . . . . . . . . . . . . . . .

55A-41

A/C OUTLET AIR TEMPERATURE DOES NOT
INCREASE . . . . . . . . . . . . . . . . . . . . . . . . .

55A-43

AIR OUTLET VENT CANNOT BE CHANGED.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-44

BLOWER MOTOR POWER SUPPLY SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-46

55A-2

A/C-ECU POWER SUPPLY SYSTEM . . . .

55A-48

SYMPTOM CHART <Vehicles with A/C> . .

55A-50

SYMPTOM PROCEDURES . . . . . . . . . . . .

55A-35

COMMUNICATION WITH THE M.U.T.-III IS NOT
POSSIBLE . . . . . . . . . . . . . . . . . . . . . . . . .

55A-50

COOL AIR DOES NOT COME . . . . . . . . . .

55A-51

BLOWER MOTOR DOES NOT OPERATE

55A-52

BLOWER AIR AMOUNT CANNOT BE CHANGED.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-55

INSIDE/OUTSIDE AIR CHANGEOVER IS NOT
POSSIBLE. . . . . . . . . . . . . . . . . . . . . . . . . .

55A-57

THE COMPRESSOR DOES NOT WORK <Petrol
engine> . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-60

THE COMPRESSOR DOES NOT WORK <Diesel
engine> . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-63

THE A/C INDICATOR FLASHES.. . . . . . . .

55A-65

A/C OUTLET AIR TEMPERATURE DOES NOT
INCREASE . . . . . . . . . . . . . . . . . . . . . . . . .

55A-66

AIR OUTLET VENT CANNOT BE CHANGED.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-67

A/C PRESSURE SENSOR SYSTEM . . . . .

55A-69

BLOWER MOTOR POWER SUPPLY SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-71

A/C-ECU POWER SUPPLY SYSTEM . . . .

55A-74

THE PTC HEATER DOES NOT WORK <Vehicles with
PTC heater> . . . . . . . . . . . . . . . . . . . . . . . .

55A-77

DATA LIST REFERENCE TABLE . . . . . . .

55A-82

ACTUATOR TEST REFERENCE TABLE. .

55A-84

CHECK AT ECU TERMINAL . . . . . . . . . . .

55A-84

ON-VEHICLE SERVICE. . . . . . . . . . .

55A-86

COMPRESSOR DRIVE BELT ADJUSTMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-86

REFRIGERANT LEVEL CHECK, DRAINING AND
CHARGING. . . . . . . . . . . . . . . . . . . . . . . . .

55A-86

REFILLING OF OIL IN THE A/C SYSTEM .

55A-86

PERFORMANCE TEST <VEHICLES USING R-134a
REFRIGERANT> . . . . . . . . . . . . . . . . . . . .

55A-86

DIAGNOSIS BY REFRIGERANT PRESSURE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-89

SIMPLE INSPECTION OF THE A/C PRESSURE
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-92

POWER RELAY CHECK . . . . . . . . . . . . . .

55A-93

IDLE-UP OPERATION CHECK . . . . . . . . .

55A-95

CLEAN AIR FILTER REPLACEMENT PROCEDURE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-96

HEATER CONTROL UNIT. . . . . . . . .

55A-96

HEATER CONTROL UNIT REMOVAL AND
INSTALLATION. . . . . . . . . . . . . . . . . . . . . .

55A-96

HEATER UNIT AND BLOWER ASSEMBLY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-97

HEATER UNIT AND BLOWER ASSEMBLY REMOVAL
AND INSTALLATION . . . . . . . . . . . . . . . . .

55A-97

HEATER UNIT AND BLOWER ASSEMBLY
DISASSEMBLY AND REASSEMBLY . . . . .

55A-101

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .

55A-102

HEATER HOSE <Diesel engine> . . .

55A-102

HEATER HOSE REMOVAL AND INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-102

MODE SELECTION DAMPER CONTROL
MOTOR, AIR MIXING DAMPER CONTROL
MOTOR, OUTSIDE/INSIDE AIR SELECTION
DAMPER CONTROL MOTOR, POWER
TRANSISTOR AND BLOWER MOTOR

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-103

MODE SELECTION DAMPER CONTROL MOTOR,
AIR MIXING DAMPER CONTROL MOTOR, OUTSIDE/
INSIDE AIR SELECTION DAMPER CONTROL
MOTOR, POWER TRANSISTOR AND BLOWER
MOTOR REMOVAL AND INSTALLATION .

55A-103

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .

55A-104

AMBIENT TEMPERATURE SENSOR

55A-105

AMBIENT TEMPERATURE SENSOR REMOVAL AND
INSTALLATION . . . . . . . . . . . . . . . . . . . . . .

55A-105

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .

55A-105

A/C-ECU . . . . . . . . . . . . . . . . . . . . . . .

55A-106

A/C-ECU REMOVAL AND INSTALLATION

55A-106

PTC HEATER <Vehicles with PTC heater>

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-107

PTC HEATER REMOVAL AND INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-107

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .

55A-108

COMPRESSOR ASSEMBLY . . . . . . .

55A-109

COMPRESSOR ASSEMBLY REMOVAL AND
INSTALLATION <1600 (M/T)> . . . . . . . . . .

55A-109

COMPRESSOR ASSEMBLY REMOVAL AND
INSTALLATION <Except 1600 (M/T)> . . . .

55A-111

COMPRESSOR ASSEMBLY INSPECTION

55A-112

COMPRESSOR ASSEMBLY DISASSEMBLY AND
ASSEMBLY <1600 (M/T)> . . . . . . . . . . . . .

55A-113

COMPRESSOR ASSEMBLY DISASSEMBLY AND
ASSEMBLY <Except 1600 (M/T)> . . . . . . .

55A-116

COMPRESSOR ASSEMBLY INSPECTION

55A-3

(DISASSEMBLY AND REASSEMBLY) . . .

55A-118

CONDENSER ASSEMBLY . . . . . . . .

55A-120

CONDENSER ASSEMBLY REMOVAL AND
INSTALLATION. . . . . . . . . . . . . . . . . . . . . .

55A-120

REFRIGERANT LINE. . . . . . . . . . . . .

55A-121

REFRIGERANT LINE REMOVAL AND
INSTALLATION <Petrol engine> . . . . . . . .

55A-121

REFRIGERANT LINE REMOVAL AND
INSTALLATION <Diesel engine> . . . . . . . .

55A-122

DUCTS . . . . . . . . . . . . . . . . . . . . . . . .

55A-124

DUCT REMOVAL AND INSTALLATION . . .

55A-124

VENTILATORS . . . . . . . . . . . . . . . . . .

55A-126

VENTILATOR REMOVAL AND INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55A-126

GENERAL INFORMATION

HEATER, AIR CONDITIONER AND VENTILATION

55A-4

GENERAL INFORMATION

M1551000100336

In addition to the normal control, A/C-ECU of the
vehicle with AS&G system performs the following
control.

NOTE: For general information of the AS&G system,
refer to GROUP 17, Auto Stop & Go (AS&G) System
.

AC905481 AB

Vehicle

stationary

Startup of travel

Engine ON

Engine OFF

Engine ON

During ID stop

Stop

ID stop

ID stop

<P

rohibition

>

<Start>

·

A/C control during ID stop

Repeats

ID stop

<Continue>

Engine OFF

· Condition change
Transmission of startup
request signal

· Condition judgement

Auto stop prohibition control

Forcible auto start request control

Comfort retaining control

Transmission of prohibition

signal

AUTO STOP PROHIBITION CONTROL

Under the conditions below with the blower fan ON,
the A/C-ECU transmits the auto stop prohibition sig-
nal to the AS&G-ECU.

• Outside air temperature is low.

• The outlet mode is set to DEF.

• The outlet temperature is high with the A/C switch

ON.

• The setting temperature is changed by 3 degrees

or more <Vehicles with automatic air condi-
tioner>.

• The interior temperature is low <Vehicles with

automatic air conditioner>.

• With the air volume/outlet mode set to Auto, MAX

HOT or MAX COOL is attained <Vehicles with
automatic air conditioner>.

FORCIBLE AUTO START REQUEST CON-
TROL

Under the conditions below with the blower fan ON
during auto stop, the A/C-ECU transmits the start
request signal to the AS&G-ECU.

• The outlet temperature rises with the A/C switch

ON.

• The outlet mode that is not in DEF is changed to

DEF.

• The A/C switch is changed from OFF to ON.

• The setting temperature is changed by 3 degrees

or more <Vehicles with automatic air condi-
tioner>.

• With the air volume/outlet mode set to Auto, it is

changed to MAX HOT or MAX COOL <Vehicles
with automatic air conditioner>.

COMFORT RETAINING CONTROL

When detecting that the auto stop is underway, A/C-
ECU performs the following controls to retain the
interior comfort of the vehicle.

• The blower fan level will be decreased. The outlet

temperature rising is restricted by reducing the air
volume that passes though the evaporator to the
extent possible.

• To prevent interior temperature rising by intrusion

of the outside air when the outside temperature is
high, the opening angle of the interior/exterior
damper will be modified. By reducing the intake
amount of the outside air, the interior comfort of
the vehicle is retained. When the outside temper-
ature is low, a certain amount of outside air is
taken to defog the windows.

• The air mix damper will be closed to prevent heat

from the heater core, minimising the effect to the
interior.