Komatsu PC200-8M0, Shop Manual, Page: 580 / 1254

301 Troubleshooting by failure code, Part 1
Failure code [AB00KE] Charge Voltage Low
40-301
10
PC200, 200LC, 220, 220LC-8M0
SEN06133-00
Failure code [AB00KE] Charge Voltage Low
Action
level
Failure code
Failure
Charging voltage low
(Machine monitor system)
L03 AB00KE
Detail of failure
q
While engine is running, voltage from alternator drops, and machine monitor detects that battery
charge voltage is low (below 7.8 V).
Action of
machine moni-
tor
q
Displays charge level monitor red on machine monitor.
q Even if cause of failure disappears, machine does not become normal until starting switch is turned
to OFF position.
Problem on
machine
q
If machine is operated as it is, battery may not be charged.
Related infor-
mation
q
Signal voltage from alternator can be checked with monitoring function.
(Code: 04300 Charge voltage)
q
Method of reproducing failure code: Start engine.
Cause Procedure, measuring location, criteria and remarks
1
Loose alternator terminal or open
circuit at terminal 1. Turn starting switch to OFF position.
2. Check terminal.
2
Defective generation by alternator
(when system is normal)
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector E12.
3. Start engine.
Between E12 (1) and
ground Engine speed: Medium
or higher
Voltage 27.5 to 29.5 V
3 Defective diode
1. Turn starting switch to OFF position.
2. Disconnect diode D01 and connect T-adapter to male side.
a
Check the continuity in diode range.
Between D01 (male) (2) (+) and (6) (-) No continuity
Between D01 (male) (6) (+) and (2) (-) Continuity
4
Defective wiring harness or
machine monitor
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector CM01.
3. Start engine.
Between CM01 (16) and ground Voltage 20 to 30 V
5
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
a
If no failure is found in checks on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CM01 and E12, and connect T-adapters to each
female side.
Between C0M1 (female) (16) and E12 (female) (1) Resistance Max. 1
z
6
Ground fault in wiring harness
(contact with ground circuit)
a
If no failure is found in checks on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CM01 and E12, and connect T-adapter to either
female side.
Between CM01 (female) (16) or E12 (female) (1)
and ground
Resistance Min. 1 M
z
7 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.)