Failure Code [879Cka] Ventilating Sensor Open Circuit - Komatsu PC200-8M0 Shop Manual

SEN06151-00

Failure code [879CKA] Ventilating sensor Open Circuit

Action
Failure code
level
– 879CKA
q
Detail of failure Air conditioner controller detected open circuit in evaporator temperature (frost) sensor.
q
The air conditioner controller sends information about the evaporator temperature (frost) sensor
Action of con-
open 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 an open circuit in the evaporator temperature (frost)
machine sensor.
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
50
80-100
Failure code [879CKA] Ventilating sensor Open Circuit
Open circuit in temperature (frost) sensor
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.)
100 Air conditioner
PC200, 200LC, 220, 220LC-8M0