Mitsubishi Grandis. Manual — part 279

55-1

GROUP 55

HEATER, AIR

CONDITIONER AND

VENTILATION

CONTENTS

GENERAL INFORMATION . . . . . . . .

55-4

SERVICE SPECIFICATIONS. . . . . . .

55-4

LUBRICANTS . . . . . . . . . . . . . . . . . .

55-4

SPECIAL TOOL . . . . . . . . . . . . . . . . .

55-5

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

55-7

DIAGNOSIS TROUBLESHOOTING FLOW

55-7

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

55-7

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

55-8

DIAGNOSTIC TROUBLE CODE PROCEDURES

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

55-10

Code No. B1001,B1002: Interior temperature sensor
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-10

Code No. B1011,B1012: Ambient temperature sensor
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-12

Code No. B1021,B1022: Air thermo sensor system

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

55-15

Code No. B1041,B1042: Potentiometer system for the

front air mix damper <LHD> . . . . . . . . . . . .

55-17

Code No. B1041,B1042: Potentiometer system for the

air mix damper <RHD> . . . . . . . . . . . . . . . .

55-19

Code No.B1045: Motor drive system for the front air mix
damper . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-21

Code No. B1051,B1052: Potentiometer system for rear
air mix damper <vehicles with LHD dual automatic A/C>

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

55-23

Code No. B1051,B1052: Potentiometer system for rear
air mix damper <vehicles with RHD dual automatic
A/C> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-26

Code No.B1055 Motor drive system for rear air mix

damper <vehicles with dual automatic A/C>

55-29

Code No. B1061,B1062: Potentiometer system for air

outlet changeover damper <LHD> . . . . . . .

55-32

Code No. B1061,B1062: Potentiometer system for air

outlet changeover damper <RHD> . . . . . . .

55-34

Code No. B1065: Motor drive system for air outlet

switching damper. . . . . . . . . . . . . . . . . . . . .

55-35

Code No.U1073 Bus off error . . . . . . . . . . .

55-38

Code No.U1100: Engine CAN communication time-out

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

55-38

Code No.U1109: ETACS related CAN communication
time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-40

Code No.U1113 Multi-centre display CAN

communication time-out . . . . . . . . . . . . . . .

55-41

Code No.U1120 Engine-related CAN communication

failure information . . . . . . . . . . . . . . . . . . . .

55-42

TROUBLE SYMPTOM CHART . . . . . . . . . .

55-43

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

55-45

INSPECTION PROCEDURE 1: Communication with

the MUT-III is not possible. . . . . . . . . . . . . .

55-45

INSPECTION PROCEDURE 2: Cool air does not come

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

55-46

INSPECTION PROCEDURE 3: The front blower does

not work . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-47

INSPECTION PROCEDURE 4: The blower air volume

cannot be changed . . . . . . . . . . . . . . . . . . .

55-59

INSPECTION PROCEDURE 5: The inside/outside air

changeover is impossible. <LHD>. . . . . . . .

55-63

INSPECTION PROCEDURE 6: The inside/outside air

changeover is impossible. <RHD> . . . . . . .

55-67

INSPECTION PROCEDURE 7: The compressor does

not work <LHD>. . . . . . . . . . . . . . . . . . . . . .

55-71

INSPECTION PROCEDURE 8: The compressor does

55-2

not work <RHD> . . . . . . . . . . . . . . . . . . . . .

55-78

INSPECTION PROCEDURE 9: The outlet air
temperature can not be changed even if the amount of

solar radiation changes . . . . . . . . . . . . . . . .

55-84

INSPECTION PROCEDURE 10: The PTC heater does

not work <LHD> . . . . . . . . . . . . . . . . . . . . .

55-87

INSPECTION PROCEDURE 11: The PTC heater does

not work <RHD> . . . . . . . . . . . . . . . . . . . . .

55-99

INSPECTION PROCEDURE 12: The rear window

defogger does not work. . . . . . . . . . . . . . . .

55-109

INSPECTION PROCEDURE 13: The A/C indicator
flashes. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-119

INSPECTION PROCEDURE 14: Rear blower does not
work <Vehicle with rear heater or rear cooler>

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

55-120

INSPECTION PROCEDURE 15: Rear blower does not

work <vehicles with dual automatic A/C> . .

55-127

INSPECTION PROCEDURE 16: Air volume of rear

blower cannot be changed . . . . . . . . . . . . .

55-134

INSPECTION PROCEDURE 17: The temperature of
rear air conditioner cannot be controlled <vehicles with

dual automatic A/C> . . . . . . . . . . . . . . . . . .

55-138

INSPECTION PROCEDURE 18: A/C pressure sensor

system <LHD> . . . . . . . . . . . . . . . . . . . . . .

55-142

INSPECTION PROCEDURE 19: A/C pressure sensor

system <RHD> . . . . . . . . . . . . . . . . . . . . . .

55-144

INSPECTION PROCEDURE 20: Rear fan switch

system <LHD> . . . . . . . . . . . . . . . . . . . . . .

55-146

INSPECTION PROCEDURE 21: Rear fan switch

system <RHD> . . . . . . . . . . . . . . . . . . . . . .

55-149

INSPECTION PROCEDURE 22: Rear blower motor

power supply system <LHD> . . . . . . . . . . .

55-152

INSPECTION PROCEDURE 23: Rear blower motor

power supply system <RHD> . . . . . . . . . . .

55-160

INSPECTION PROCEDURE 24: PTC heater switch

system <LHD> . . . . . . . . . . . . . . . . . . . . . .

55-168

INSPECTION PROCEDURE 25: PTC heater switch

system <RHD> . . . . . . . . . . . . . . . . . . . . . .

55-171

INSPECTION PROCEDURE 26: A/C-ECU power

supply system <LHD> . . . . . . . . . . . . . . . . .

55-174

INSPECTION PROCEDURE 27: A/C-ECU power

supply system <RHD> . . . . . . . . . . . . . . . .

55-178

SERVICE DATA REFERENCE TABLE . . .

55-183

ACTUATOR TEST TABLE . . . . . . . . . . . . .

55-186

CHECK AT A/C-ECU TERMINALS. . . . . . .

55-187

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

55-190

COMPRESSOR DRIVE BELT ADJUSTMENT

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

55-190

DISCHARGING SYSTEM . . . . . . . . . . . . . .

55-190

CHARGING. . . . . . . . . . . . . . . . . . . . . . . . .

55-191

CHECK THE REFRIGERANT LEVEL . . . .

55-193

CORRECTING LOW REFRIGERANT LEVEL IN CASE

THE SERVICE CAN IN USED . . . . . . . . . .

55-193

PERFORMANCE TEST . . . . . . . . . . . . . . .

55-193

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

55-195

RELAY CONTINUITY CHECK . . . . . . . . . .

55-196

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

55-198

CLEAN AIR FILTER REPLACEMENT PROCEDURE

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

55-198

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

55-199

REMOVAL AND INSTALLATION . . . . . . . .

55-199

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

55-199

HEATER UNIT AND BLOWER ASSEMBLY

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

55-200

REMOVAL AND INSTALLATION . . . . . . . .

55-200

DISASSEMBLY AND REASSEMBLY . . . . .

55-203

HEATER UNIT DISASSEMBLY AND REASSEMBLY

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

55-204

BLOWER ASSEMBLY DISASSEMBLY AND
REASSEMBLY . . . . . . . . . . . . . . . . . . . . . .

55-205

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

55-205

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

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

55-206

REMOVAL AND INSTALLATION . . . . . . . .

55-206

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

55-208

PHOTO SENSOR AND INTERIOR
TEMPERATURE SENSOR . . . . . . . . .

55-210

REMOVAL AND INSTALLATION . . . . . . . .

55-210

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

55-211

AMBIENT TEMPERATURE SENSOR

55-211

REMOVAL AND INSTALLATION . . . . . . . .

55-211

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

55-211

HEAT SWITCH . . . . . . . . . . . . . . . . . .

55-212

REMOVAL AND INSTALLATION <REAR HEATER OR

REAR A/C VEHICLES>. . . . . . . . . . . . . . . .

55-212

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

55-212

REAR A/C SWITCH . . . . . . . . . . . . . .

55-213

REMOVAL AND INSTALLATION . . . . . . . .

55-213

55-3

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

55-213

REAR HEATER UNIT . . . . . . . . . . . .

55-214

REMOVAL AND INSTALLATION . . . . . . . .

55-214

DISASSEMBLY AND REASSEMBLY <VEHICLES
WITH REAR HEATER, REAR COOLER OR DUAL

AUTOMATIC A/C> . . . . . . . . . . . . . . . . . . .

55-215

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

55-216

REAR BLOWER MOTOR AND REAR POWER
TRANSISTOR . . . . . . . . . . . . . . . . . .

55-217

REMOVAL AND INSTALLATION . . . . . . . .

55-217

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

55-217

COMPRESSOR ASSEMBLY. . . . . . .

55-218

REMOVAL AND INSTALLATION . . . . . . . .

55-218

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

55-219

DISASSEMBLY AND REASSEMBLY. . . . .

55-220

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

55-221

CONDENSER ASSEMBLY. . . . . . . . .

55-222

REMOVAL AND INSTALLATION . . . . . . . .

55-222

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

55-223

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

55-224

REMOVAL AND INSTALLATION <L.H.D. FRONT
SIDE> . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-224

REMOVAL AND INSTALLATION <R.H.D. FRONT
SIDE> . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55-225

REAR REFRIGERANT REMOVAL AND

INSTALLATION <REAR SIDE> . . . . . . . . .

55-226

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

55-227

REMOVAL AND INSTALLATION . . . . . . . .

55-227

REMOVAL AND INSTALLATION . . . . . . . .

55-228

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

55-229

REMOVAL AND INSTALLATION . . . . . . . .

55-229

GENERAL INFORMATION

HEATER, AIR CONDITIONER AND VENTILATION

55-4

GENERAL INFORMATION

M1552000100425

The heater and cooling units of front and rear air
conditioners in the heater and air conditioner
systems are integrated for greater fan power and
reduced noise. In the air conditioner system, single
automatic air conditioner for the front, and heater,
cooler, or dual automatic air conditioner for the rear
are established.

GENERAL SPECIFICATIONS

SERVICE SPECIFICATIONS

M1551000300125

LUBRICANTS

M1551000400111

Item

Specification

Heater control type

Rotary type

Compressor type

MSC105CA

Front air conditioner

Cooling output W

5400

Heating output W

5500

Heating capacity of PTC heater
(W)

120

× 2

Rear air conditioner

Cooling output W

2100

Heating output W

2700

Item

Standard value

Idle speed r/min (N or P range)

700

± 50

Idle-up speed r/min (N or P range)

850

± 50

Air gap (magnetic clutch) mm

0.3

− 0.5

A/C refrigerant temperature switch operating
temperature

°C

Being turned off

155

Being turned on

125

Resistance value for front air mixing damper control motor and potentiometer k

Ω

1.7

− 5.0

Resistance value for mode selection damper control motor and potentiometer k

Ω

0.8

− 4.8

Resistance value for rear air mixing damper control motor and potentiometer k

Ω

1.2

− 4.8

Item

Specified lubricant Quantity

Compressor refrigerant unit lubricant mL

SUN PAG 56

160

−180 (target

value:160)

Each connection of refrigerant line

SUN PAG 56

As required

Refrigerant g

Single A/C

HFC134a (R134a)

560

± 25

Vehicles with rear cooler or dual
automatic A/C

HFC134a (R134a)

750

± 25