Komatsu PC200-8M0, Shop Manual, Page: 714 / 1254

303 Troubleshooting by failure code, Part 3
Failure code [DB2QKR] CAN2 Discon (Engine Con)
40-303
38
PC200, 200LC, 220, 220LC-8M0
SEN06135-00
Cause Procedure, measuring location, criteria and remarks
8
Short circuit or hot short circuit in
wiring harness (contact with 24 V
(contact with 24 V circuit)
a
If no failure is found by check on cause 5 (no open circuit), measure in only
one place each.
1. Turn starting switch to OFF position, and disconnect battery ground cable.
2. Disconnect connector at which measurement is performed and insert
T-adapters into connector.
3. Connect battery ground cable.
4. Turn starting switch to ON position.
a
Since voltages of CAN H and CAN L lines are 2.5 ± 1 V including during
communication, harnesses are considered normal as long as their voltages
are between 1 and 4 V.
Between ground and any one of CM02 (female) (8),
C01 (female) (45), CK01 (female) (10), AC01
(female) (2), CE02(female)(46)
Voltage 1 to 4 V
Between ground and any one of CM02 (female) (9),
C01 (female) (64), CK01 (female) (11), AC01
(female) (1), CE02 (female) (47)
Voltage 1 to 4 V
9
Defective engine controller, pump
controller, air conditioner unit or
KOMTRAX terminal
q
If all four failure codes [ DA2QKR ], [ DB2QKR ], [ D8AQKR ], and [ DAZQKR ]
are displayed
a
Repeat following steps 1. to 3. to disconnect controllers one by one from
CAN communication and to identify defective controller.
1. Turn starting switch to OFF position and disconnect battery ground cable.
2. Disconnect CAN communication connector of engine controller (connector
CE03), pump controller (connector CP01), air conditioner unit (connector
AC01),and KOMTRAX terminal (connector CK01) one by one.
3. Connect battery ground cable, turn starting switch to ON position, then
perform troubleshooting.
4. Return to step 1. and troubleshoot next controller.
Has the number of displayed failure codes
decreased from four? If YES, disconnected
controller is defective.
10 Defective engine controller
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
11 Defective machine monitor
If no failure is found by above checks, machine monitor is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)