Failure Code [Da2Qkr] Can 2 Defective Communication (Pump Con) - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)
Failure code [DA2QKR] CAN 2 Defective Communication (Pump
Con)
(PC88MR-DA2QKR-400-A-Z0-A)
Action level Failure code
DA2QKR
L03
Machine monitor does not recognize pump controller through CAN communication 2 line
Detail of
(KOMNET/c).
failure
Action of
Retains information at time of occurrence of failure.
controller
Information to be obtained from pump controller is not displayed and special functions that
Problem on
need information do not work. Or update of received data is stopped (such as failure
machine
codes and monitoring codes sent from the pump controller).
Method of reproducing failure code: Turn starting switch to ON position.
Start of CAN communication is recognized by each controller when ACC signal of starting
switch is received.
4 different failure codes, [DA2QKR], [DB2QKR], [D8AQKR], and [DAZQKR], are used for
defective CAN communication by CAN2, which are detected by machine monitor. When
all of these 4 failure codes are displayed, there may be a ground fault, short circuit, or hot
short in wiring harness (CAN communication circuit). In this case, check whether air
conditioner is operated (ON/OFF and air flow adjustment) from air conditioner operation
Related screen since air conditioner is also controlled over CAN communication line.
information This can be activated even when power supply to pump controller is OFF.
a Air conditioner can be controlled even when failure code is displayed on screen. If air
conditioner is controlled, wiring harness (CAN communication line) does not have ground
fault, short circuit, or hot short circuit.
Since each controller and machine monitor are connected directly to battery, they are
supplied with power even after starting switch is turned to OFF position.
Since signal of active CAN communication line is pulse voltage, it cannot be measured by
using multimeter.
No. Cause
Defective fusible link
1
F03
Defective fuse No. 17 in
2
fuse box F01
Improper power supply
3
to pump controller
Open circuit in wiring
harness
4
(wire breakage or
defective contact of
connector)
Defective CAN
communication 2
5
system
40-268
CAN2 Defective Communication (Pump Controller)
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 F03 and connect T-adapter to female side.
Resistance Between F03 (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.
If fuse is blown, circuit probably has ground fault.
a Check ground terminal T09 for looseness and rust.
1. Turn starting switch to OFF position.
2. Disconnect connector CP01 and connect T-adapter to female side.
3. Turn starting switch to ON position.
Between CP01 (female) (1) and (2)
Voltage
Between CP01 (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 set battery disconnect switch to
OFF position.
2. Remove fuse No. 17 in fuse box F01.
3. Disconnect connectors F03 and CP01, and connect T-adapters to each
female side.
Between terminal R04 and F03 (female) (1)
Between F03 (female) (2) and F01-16D
Resistance
Between F01-17 and CP01 (female) (1)
Between F01-17 and CP01 (female) (4)
Perform checks on causes 4 to 9 in troubleshooting for failure code
[DB2QKR].
Max. 1 z
20 to 30 V
20 to 30 V
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
PC88MR-10