Failure Code [Da2Qkr] Can2 Discon (Pump Con) - Komatsu PC200-8M0 Shop Manual

303 Troubleshooting by failure code, Part 3

Failure code [DA2QKR] CAN2 Discon (Pump Con)

Failure code [DA2QKR] CAN2 Discon (Pump Con)
Action
Failure code
level
L03 DA2QKR
q
Machine monitor does not recognize pump controller through CAN communication 2 line
Detail of failure
(KOMNET/c).
Action of con-
q
Holds information at the time of occurrence of failure.
troller
q
Information to be obtained from pump controller is not displayed or special function that uses infor-
Problem on
mation from pump controller does not work. Or received data (failure codes, monitoring codes, etc.
machine
transmitted from pump controller) is no longer updated.
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
Machine monitor uses four failure codes, [DA2QKR], [DB2QKR], [D8AQKR], and [DAZQKR], to
indicated failure in CAN communication through CAN 2 line. When all of these failure code are dis-
played simultaneously on screen, ground fault, short circuit, or hot short circuit may occur in wiring
harness (CAN communication line). Since air conditioner is also controlled through CAN commu-
nication, check whether air conditioner is operated (ON/OFF and air flow adjustment) on air condi-
Related infor-
tioner screen.
mation
q
This code appears even when pump controller power supply is shut off.
a Air conditioner can be operated even when failure code is displayed on machine monitor screen. If
air conditioner is operated, there is no possibility of ground fault, short circuit, or hot short circuit 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 signal of active CAN communication line is pulse voltage, it cannot be measured by using
multimeter.
Cause
1 Defective fusible link F05
Defective fuse No. 17 in fuse box
2
F01
Improper power supply to pump
3
controller
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
Defective CAN communication 2
5
line
PC200, 200LC, 220, 220LC-8M0
CAN2 Discon (Pump Con)
Failure
(Detected by machine monitor) (Machine monitor system)
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect fusible link F05 and connect T-adapters to female side.
Resistance Between F05 (female) (1) and (2)
a If fusible link is blown, circuit may have ground fault.
1. Turn starting switch to OFF position.
2. Remove fuse No. 17 in fuse box F01.
When fuse is blown, circuit may have ground fault.
a Check ground terminal T04 for looseness and rust.
1. Turn starting switch to OFF position.
2. Disconnect connector C01 and connect T-adapters to female side.
3. Turn starting switch to ON position.
Between C01 (female) (1) and (2)
Voltage
Between C01 (female) (4) and (5)
a If no failure is found by check on cause 3, this check is not required.
1. Turn starting switch to OFF position, and disconnect ground cable.
2. Remove fuse No. 17 in fuse box F01.
3. Disconnect fusible link F05 and connector C01, and connect Tadapters to
each female side.
Between terminal R04 and F05 (female) (1)
Between F05 (female) (2) and F01-16E
Resistance
Between F01-17 and C01 (female) (1)
Between F01-17 and C01 (female) (4)
Perform checks on cause 4 to 9 in troubleshooting for failure code [DB2QKR].
SEN06135-00
Max. 1 z
20 to 30 V
20 to 30 V
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
23
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