Mitsubishi Grandis. Manual - part 280

SPECIAL TOOL

HEATER, AIR CONDITIONER AND VENTILATION

55-5

SPECIAL TOOL

M1551000600085

SPECIAL TOOL

HEATER, AIR CONDITIONER AND VENTILATION

55-6

Tool

Number

Name

Use

MB991367

Special spanner

Removal and installation 

of air conditioner 
compressor armature 
mounting nut

MB991386

Pin

MB991658

Test harness

Inspection of the A/C 
pressure sensor

B991367

MB991658

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-7

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

M1554004700168

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-5

.

DIAGNOSIS FUNCTION

M1554004800187

HOW TO READ DIAGNOSIS CODE

Connect the MUT-III to the 16-pin diagnosis 
connector to read diagnosis code (Refer to GROUP 
00, How to Use Troubleshooting/Inspection Service 
Points 

P.00-5

).

HOW TO ERASE DIAGNOSIS CODE

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-5

.

MB991955
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826

MUT-III sub-assembly
A: V. C. I. (Vehicle 
Communication 
Interface)
B: USB cable
C: MUT-III main harness 
A (applicable to vehicles 
with CAN 
communication)
D: MUT-III main harness 
B (applicable to vehicles 
without CAN 
communication)
E: Measurement adapter
F: Trigger harness

Check the air conditioner 
(The MUT-III diagnosis 
codes display, service 
data display and 
actuator test)

CAUTION

For vehicles with CAN 
communication, use 
MUT-III main harness A 
to send simulated 
vehicle speed. If you 
connect MUT-III main 
harness B instead, the 
CAN communication 
does not function 
correctly.

Tool

Number

Name

Use

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

A

B

C

D

E

F

DO NOT USED

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-8

DIAGNOSIS CODE CHART

M1554004900258

Code No.

Diagnostic item

Reference page Service data 

display 
contents when 
diagnosis code 
is set

B1001

Interior temperature sensor system (short circuit) 
<LHD>

P.55-10

25

°C

Interior temperature sensor system (short circuit) 
<RHD>

P.55-10

B1002

Interior temperature sensor system (open circuit) 
<LHD>

P.55-10

Interior temperature sensor system (open circuit) 
<RHD>

P.55-10

B1011

Ambient temperature sensor system (short circuit) 
<LHD>

P.55-12

20

°C

Ambient temperature sensor system (short circuit) 
<RHD>

P.55-12

B1012

Ambient temperature sensor system (open circuit) 
<LHD>

P.55-12

Ambient temperature sensor system (open circuit) 
<RHD>

P.55-12

B1021

Air thermo sensor system (short circuit) <LHD>

P.55-15

−6°C

Air thermo sensor system (short circuit) <RHD>

P.55-15

B1022

Air thermo sensor system (open circuit) <LHD>

P.55-15

Air thermo sensor system (open circuit) <RHD>

P.55-15

B1041

Potentiometer system for front air mix damper (short to 
power supply) <LHD>

P.55-17

Moved to MAX 
HOT position

Potentiometer system for front air mix damper (short to 
power supply) <RHD>

P.55-19

B1042

Potentiometer system for front air mix damper (short to 
earth or open circuit) <LHD>

P.55-17

Potentiometer system for front air mix damper (short to 
earth or open circuit) <RHD>

P.55-19

B1045

Motor drive system for front air mix damper 

P.55-21

−

B1051

Potentiometer system for rear air mix damper (short to 
power supply) <vehicles with LHD dual automatic A/C>

P.55-23

Moved to MAX 
HOT position

Potentiometer system for rear air mix damper (short to 
power supply) <vehicles with RHD dual automatic A/C>

P.55-26

B1052

Potentiometer system for rear air mix damper (short to 
earth or open circuit) <vehicles with LHD dual 
automatic A/C>

P.55-23

Potentiometer system for rear air mix damper (short to 
earth or open circuit) <vehicles with RHD dual 
automatic A/C>

P.55-26