Failure Code [879Dkz] Sunlight Sensor Open Or Short Circuit - Komatsu PC200-8M0 Shop Manual

SEN06151-00

Failure code [879DKZ] Sunlight sensor Open or Short Circuit

Action
Failure code
level
– 879DKZ
q
Detail of failure Air conditioner controller detected open or short circuit in sunlight sensor.
q
The air conditioner controller sends information about the sunlight sensor open or short circuit to
Action of con-
the machine monitor via CAN communication.
troller
q
Continues control of air conditioner in automatic mode, ignoring data of sunlight sensor.
q
Problem on Since there is an open or short circuit in the air conditioner sunlight sensor, sunlight strength is not
machine counted in automatic mode. (does not have any effect to the air conditioner 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-
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
1 Defective sunlight sensor
Open circuit in wiring harness
2 (wire breakage or defective con-
tact of connector)
3 Defective air conditioner controller
4 Defective air conditioner unit
52
80-100
Failure code [879DKZ] Sunlight sensor Open or Short Circuit
Sunlight sensor open or short circuit
Failure
(Machine monitor system)
Procedure, measuring location, criteria and remarks
1. See "Testing sunlight sensor".
Between sunlight sensor terminals
Voltage Between sunlight sensor terminals
Between sunlight sensor terminals
1. Turn starting switch to OFF position.
2. Disconnect connector P31.
a See "Testing sunlight sensor".
Between P31 (female) (1) and AC01 (female) (10)
Resistance
Between P31 (female) (2) and AC01 (female) (9)
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.
100 Air conditioner
Direct sun- Approx.
light
Approx.
Cloudy
Approx. 0.4
Indoors
Max. 1 z
Max. 1 z
PC200, 200LC, 220, 220LC-8M0
0.55 V
0.45 V
V