Komatsu PC88MR-10 Shop Manual page 1392

80 Appendix
A-1 Troubleshooting for power supply system (Air
conditioner does not operate)
No. Cause
Ground fault in wiring
harness
4
(Contact with ground
circuit)
Open circuit in wiring
5
harness
Defective air conditioner
6
controller
Defective air conditioner
7
unit
Defective machine
8
monitor
Circuit diagram related to power supply system
80-68
Procedure, measuring location, criteria, and remarks
a If a fuse is blown again in the above test, perform the following procedure.
1. Turn starting switch to OFF position.
2. Turn the battery disconnect switch to OFF position.
3. Disconnect connector AC02.
4. Remove fuse No. 14 in fuse box F04.
Between ground and connector AC02 (female) (4)
Resistance
(blue) or F01-14
1. Turn starting switch to OFF position.
2. Turn the battery disconnect switch to OFF position.
3. Disconnect connector AC02.
4. Remove fuse No. 14 in fuse box F01.
Between connector AC02 (female) (4) (red) and
Resistance
F01-14
Replace the air conditioner controller.
If no failure is found by the above checks, the air conditioner unit may be
defective.
If no failure is found by above checks, machine monitor is defective.
Min. 1 Mz
Max. 1 z
PC88MR-10