Komatsu PC200-8M0 Shop Manual page 713

303 Troubleshooting by failure code, Part 3
Failure code [DB2QKR] CAN2 Discon (Engine Con)
Cause
Open or short circuit in wiring har-
5
ness
Open circuit in wiring harness
6 (wire breakage or defective con-
tact of connector)
Ground fault in wiring harness
7
(contact with ground circuit)
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
q
CAN communication line
a Machine monitor also has 120 z CAN terminating resistor in it. Since 120 z
resistors are connected in parallel, if resistance measured at connector of
controller other than machine monitor is 60 z which is combined resistance,
there is no open circuit in wiring harness.
1. Turn starting switch to OFF position and disconnect battery ground cable.
2. Disconnect related connectors and connect T-adapters to connector at
which measurement is performed.
a If short circuit occurs (if resistance between terminals is 1 z or less), discon-
nect all CAN communication connectors of each controller. Then, check
whether short circuit is in wiring harness or within controller.
Between CM02 (female) (8) and (9)
Between CE02 (female) (46) and (47)
Between C01 (female) (45) and (64)
Between AC01 (female) (1) and (2)
Between CK01 (female) (10) and (11)
Between K02 (female) (A) and (B)
q ACC signal from starting switch (CAN communication start is not recog-
nized)
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 it.
3. Connect battery ground cable, and turn starting switch to ON position.
Between CM01 (10) and (3)
Between CE02(39) and CE03(1)
Between C01 (24), (43) and (79) and (2)
Between AC02 (4) and (1)
Between CK02 (3) and (1)
a If no failure is found by check on cause 5, this check is not required.
1. Turn starting switch to OFF position, and disconnect battery ground cable.
2. Disconnect related connectors and connect T-adapters to female side of
connector at which measurement is performed.
Between CM02 (female) (8) and C01 (female) (45)
Between CM02 (female) (9) and C01 (female) (64)
Between CM02 (female) (8) and CE02 (female) (46) Resistance
Between CM02 (female) (9) and CE02 (female) (47) Resistance
Between CM02 (female) (8) and AC01 (female) (2)
Between CM02 (female) (9) and AC01 (female) (1)
Between CM02 (female) (8) and CK01 (female) (10) Resistance
Between CM02 (female) (9) and CK01 (female) (11) Resistance
Between CE02 (female) (46) and K02 (female) (A)
Between CE02 (female) (47) and K02 (female) (B)
a If no failure is found by checks on cause 5 (no open circuit), measure volt-
age at one connector.
1. Turn starting switch to OFF position and disconnect battery ground cable.
2. Disconnect related connectors and connect T-adapters to female side of
connector at which measurement is performed.
Between ground and any point in C01 (female) (45),
CM02 (female) (7), (8) or CE02 (female) (46)
Between ground and any point in C01 (female) (64),
CM02 (female) (9) or CE02 (female)(47)
SEN06135-00
Approx.
Resistance
120 z
Approx.
Resistance
60 z
Approx.
Resistance
60 z
Approx.
Resistance
60 z
Approx.
Resistance
60 z
Approx.
Resistance
120 z
Voltage 20 to 30 V
Voltage 20 to 30 V
Voltage 20 to 30 V
Voltage 20 to 30 V
Voltage 20 to 30 V
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Max. 1 z
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Max. 1 z
Max. 1 z
Resistance
Max. 1 z
Resistance
Resistance Min. 1 Mz
Resistance Min. 1 Mz
37
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