Failure Code [879Ckb] Ventilating Sensor Short Circuit - Komatsu PC200-8M0 Shop Manual

100 Air conditioner

Failure code [879CKB] Ventilating sensor Short Circuit

Failure code [879CKB] Ventilating sensor Short Circuit
Action
Failure code
level
– 879CKB
q
Detail of failure Air conditioner controller detected short circuit in evaporator temperature (frost) sensor.
q
The air conditioner controller sends information about the evaporator temperature (frost) sensor
Action of con-
short circuit to the machine monitor via CAN communication.
troller
q
Stops the air conditioner.
q
Problem on The air conditioner does not operate due to a short circuit in the evaporator temperature (frost) sen-
machine sor.
q
Method of reproducing failure code: Turn starting switch to ON position.
q
Check whether this failure code is displayed in the "Electrical Systems" (electrical systems abnor-
Related infor-
mality record) screen in the service mode of the machine monitor.
mation
q
Troubleshooting cannot be performed since the connector portion of the evaporator temperature
(frost) sensor cannot be checked while the air conditioner unit is installed on the machine.
Cause
1 Defective air conditioner controller
2 Defective air conditioner unit
PC200, 200LC, 220, 220LC-8M0
Evaporator temperature (frost) sensor short circuit
Failure
(Machine monitor system)
Procedure, measuring location, criteria and remarks
If no failures are found by the above checks, the air conditioner controller may
be defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
If no failures are found by the above checks, the air conditioner unit may be
defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
SEN06151-00
51
80-100