Failure Code [Ab00Ke] Charge Voltage Low - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [AB00KE] Charge Voltage Low

Action level Failure code
L03 AB00KE
While engine is running, voltage from alternator drops, and machine monitor detects that
Detail of
battery charge voltage is low (below 7.8 V).
failure
Displays charge level monitor red on machine monitor.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
machine
is turned to OFF position.
monitor
Problem on
If machine continues to be operated, battery may not be charged.
machine
Signal voltage of alternator can be checked by using monitoring function.
Related
(Code: 04300)
information
Method of reproducing failure code: Start engine.
No. Cause
Loose alternator
1 terminal or open circuit
at terminal
Defective power
generation of alternator
2
(When system works
properly.)
3 Defective diode
Defective wiring
4 harness or machine
monitor
Open circuit in wiring
harness
5
(wire breakage or
defective contact of
connector)
Ground fault in wiring
harness
6
(contact with ground
circuit)
Defective machine
7
monitor
40-124
Charge Voltage Low
Failure
(Machine monitor system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Check terminal.
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector E12.
3. Start engine.
Between E12 (1) and
Voltage
ground
1. Turn starting switch to OFF position.
2. Disconnect diode D01 and connect T-adapters to male side.
a Measure it with diode range of multimeter.
Between D01 (male) (2) (+) and (6) (-)
Continuity
Between D01 (male) (6) (+) and (2) (-)
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector CM01.
3. Start engine.
Voltage Between CM01 (16) and ground
a If no failure is found by check 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 each
female side.
Resistance Between CM01 (female) (16) and E12 (female) (1)
a If no failure is found by check 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)
Resistance
and ground
If no failure is found by above checks, machine monitor is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
(PC138-AB00KE-400-A-Z0-A)
Engine speed: Medium
or above
27.5 to 29.5
V
No
continuity
Continuity
20 to 30 V
Max. 1 z
Min. 1 Mz
PC88MR-10