Failure Code [Dazqkr] Can2 Discon (Aircon Ecu) - Komatsu PC200-8M0 Shop Manual

SEN06135-00

Failure code [DAZQKR] CAN2 Discon (Aircon ECU)

Action
Failure code
level
L01 DAZQKR
q
Machine monitor does not recognize air conditioner controller over CAN communication-2 line
Detail of failure
(KOMNET/c).
q
Action of con- Holds information at the time of occurrence of failure.
q
troller If cause of failure disappears, machine becomes normal by itself.
q
Failure codes to be generate by air conditioner controller are not displayed.
q
Problem on Monitoring data for which air conditioner controller is responsible are not updated.
q
machine Air conditioner will be inoperable.
q
Air conditioner control screen will not be displayed correctly on the machine monitor.
q
Method of reproducing failure code: Turn starting switch to ON position.
q
Start of CAN communication is recognized by each controller when ACC signal of starting switch
is received.
q
For CAN communication error over CAN communication-2 line, machine monitor can generate four
failure codes; [D8AQKR], [DA2QKR], [DAZQKR] and [DB2QKR]. When all of these four failure
Related infor-
codes are displayed simultaneously on screen, ground fault, short circuit, or hot short circuit may
mation
occur in wiring harness (CAN communication line).
q
Since each controller and machine monitor are connected to continuous power supply, they receive
continuous power even while starting switch is at OFF position.
q
Since active CAN communication line signal is pulse voltage, it cannot be measured by using mul-
timeter.
Cause
Defective power supply to air con-
1
ditioner controller
Defective CAN2 communication
2
system
3 Defective air conditioner controller
4 Defective machine monitor
34
40-303
CAN2 Disconnection (Air Conditioner ECU)
Failure
(Detected by machine monitor) (Machine monitor system)
Procedure, measuring location, criteria and remarks
a Perform troubleshooting in Chapter 80 "Troubleshooting for power supply
system".
Perform checks on cause 4 to 9 in troubleshooting for failure code [DB2QKR].
If no failure is found by above checks, air conditioner controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
If no failure is found by above checks, machine monitor is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
303 Troubleshooting by failure code, Part 3
Failure code [DAZQKR] CAN2 Discon (Aircon ECU)
PC200, 200LC, 220, 220LC-8M0