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Parts and connectors layout
Three fuses related to the air conditioner are located in the fuse box at the rear left of the operator's seat.
The air conditioner unit is installed in the rear cover at the rear side of the operator's seat.
Park the machine on a level surface, lower the work equipment to the ground so that it is stable,
and stop the engine.
Turn the battery disconnect switch to "OFF" position, and remove the key.
a Note the connector numbers and installed positions before disconnecting wiring harnesses and hoses.
Connector No.
AC01
Intermediate connector
AC02
Intermediate connector
Air conditioner compressor
AC03
ACECU
Air conditioner controller
CM01*
Machine monitor
CM02
Machine monitor
CM04*
Machine monitor
F01
Fuse box
Dual pressure switch
P17
Outside air temperature sensor
P18
Sunlight sensor
P31
Relay
R21
[1]
Blower motor
[2]
Power transistor
[3]
Vent (mode) servomotor
[4]
Temperature control (air mix) servomotor
[5]*
FRESH/RECIRC air changeover servomotor
[6]*
Inside air temperature sensor
[7]*
Evaporator temperature sensor (frost sensor)
*: Connectors not identified in the troubleshooting
Details
(PC88MR-K500-04D-K-01-A)
1. Fuses in fuse box F01
Open the cover of fuse box at the rear left of the operator's seat.
No. 10 (20 A): Fuse for power supply to blower (fan) and air conditioner compressor
No. 14 (5 A): Fuse for air conditioner unit, air conditioner controller and primary side power supply of
electromagnetic clutch relay of air conditioner compressor
No. 19 (5 A): Fuse for power supply (backup power supply) to air conditioner controller
2. Air conditioner controller
1) Remove covers (1) and (2) in the rear side of the operator's seat.
PC88MR-10
(PC88MR-K500-055-K-00-A)
Remarks
Parts and connectors layout
Location
Rear left of the cab
Rear left of the cab
Engine
Rear left of the cab
Front side of the cab
Front side of the cab
Front side of the cab
Rear left of the cab
Under cab
Cooling unit
Machine monitor
Rear left of the cab
Air conditioner unit
Air conditioner unit
Air conditioner unit
Air conditioner unit
Air conditioner unit
Air conditioner unit
Air conditioner unit
80 Appendix
Item to be
referred
2.
2.
7.
2.
5.
5.
5.
1.
6.
8.
4.
2.
3.
3.
3.
3.
80-31
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