Failure Code [879Akb] A/C Inner Sensor Short Circuit - Komatsu PC200-8M0 Shop Manual

100 Air conditioner

Failure code [879AKB] A/C Inner sensor Short Circuit

Failure code [879AKB] A/C Inner sensor Short Circuit
Action
Failure code
level
– 879AKB
q
Detail of failure Air conditioner controller detected short circuit in inside (air) temperature sensor.
q
The air conditioner controller sends information about the inside (air) temperature sensor short cir-
Action of con-
cuit to the machine monitor via CAN communication.
troller
q
Stops the air conditioner if it is in automatic mode.
q
The air conditioner does not operate in automatic mode because of a short circuit in the air condi-
Problem on
tioner inside air temperature sensor.
machine
(The air conditioner can be operated in manual mode)
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 air conditioner inside (air)
temperature sensor cannot be checked while the controller is installed on the machine.
Cause
1 Defective air conditioner controller
2 Defective air conditioner unit
PC200, 200LC, 220, 220LC-8M0
Short circuit in air conditioner inside air temperature 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.)
SEN06151-00
45
80-100