Failure Code [D8Aqkr] Can 2 Defective Communication (Komtrax) - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)
Failure code [D8AQKR] CAN 2 Defective Communication
(KOMTRAX)
(PC88MR-D8AQKR-400-A-Z0-A)
Action level Failure code
D8AQKR
Machine monitor does not recognize KOMTRAX over CAN communication-2 line
Detail of
(KOMNET/c).
failure
Action of
machine None
monitor
Problem on
None
machine
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
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
Defective power supply
3
to KOMTRAX terminal
Defective CAN
communication 2
4
system
Defective KOMTRAX
5
terminal
Defective machine
6
monitor
40-256
CAN2 Disconnection (KOMTRAX)
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.
Perform troubleshooting for "E-54" of E mode.
Perform checks on causes 4 to 9 in troubleshooting for failure code
[DB2QKR].
If no failure is found by above checks, KOMTRAX terminal 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.)
Max. 1 z
PC88MR-10