Failure Code [879Gkx] Refrigerant Abnormality - Komatsu PC200-8M0 Shop Manual

SEN06151-00

Failure code [879GKX] Refrigerant Abnormality

Action
Failure code
level
L01 879GKX
q
Detail of failure Air conditioner controller detected that dual pressure switch was OFF (abnormal).
q
The air conditioner controller sends information about the refrigerant pressure abnormality to the
machine monitor via CAN communication.
Action of con-
q
The air conditioner controller turns OFF compressor clutch relay, since refrigerant pressure is ab-
troller
normal.
(air conditioner compressor stops)
Problem on
q
Air conditioner (cooling) does not work
machine
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-
mality record) screen in the service mode of the machine monitor.
q For connectors etc., see "Parts and connectors layout".
Related infor-
q
Since connector ACECU of the air conditioner controller has small pins and does not have a
mation
T-adapter, perform troubleshooting by using the intermediate connector (Although the intermediate
connector does not have a T-adapter either, it does have large pins).
q
To replace the air conditioner harness between air conditioner controller connector ACECU and
intermediate controller, the air conditioner unit must be replaced.
Cause
Defective refrigerant (dual) pres-
1
sure switch
Open circuit in wiring harness
2 (wire breakage or defective con-
tact of connector)
3 Defective air conditioner controller
4 Defective air conditioner unit
56
80-100
Refrigerant (dual) pressure switch abnormality
Failure
(Machine monitor system)
Procedure, measuring location, criteria and remarks
1. See "Testing (dual) pressure switch for refrigerant".
k
When replacing the dual pressure switch, be sure to collect refriger-
ant in advance. See "Caution for refrigerant"
1. Turn starting switch to OFF position.
2. Disconnect connectors AC01 and AC05.
Between P17 (female) (1) and AC01 (female) (6)
Resistance
Between P17 (female) (2) and ground
a Looseness and rust of T06
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 failure is found by above checks, air conditioner unit may be defective.
Failure code [879GKX] Refrigerant Abnormality
PC200, 200LC, 220, 220LC-8M0
100 Air conditioner
Max. 1 z
Max. 1 z