Failure Code [Ab00Ma] Alternator R System: Ground Fault/Disconnection Charge/Low Charge Voltage - Komatsu WA250-6 Shop Manual

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Failure code [AB00MA] Alternator R system: Ground fault/Disconnection charge/Low charge voltage

Failure code [AB00MA] Alternator R system: Ground fault/Disconnection
charge/Low charge voltage
Action code Failure code
E03 AB00MA
Contents of
• While the engine is running, the alternator terminal R input voltage is below 5 V.
trouble
Action of • Turns the charge circuit failure caution lamp ON.
machine monitor
• Turns the centralized warning lamp and alarm buzzer ON.
• Deterioration of battery or insufficient charging
Problem that
appears on
• Engine does not start.
machine
• Service meter does not advance.
• The input state (voltage) from the alternator can be checked with the monitoring function (Monitoring
Related
code: HST – 04302 – ALTERNATOR R).
information
• Method of reproducing failure code: Start engine
1 The battery is deteriorated.
Defective alternator
2
(Internal trouble)
Disconnection in wiring har-
ness
Possible causes 3
(Disconnection or defective
and standard
contact in connector)
value in normal
state
Grounding fault in wiring har-
4 ness
(Contact with ground circuit)
5 Defective machine monitor
10
40-310
Alternator R system: Ground fault/Disconnection charge/Low
Trouble charge voltage
(Machine monitor system)
Causes
The battery may be deteriorated. Check it directly.
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
(female) (1) – ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harnesses between E02 (female) (1)
– L25 (female) (18)
a Prepare by turning starting switch OFF and then start engine to
carry out troubleshooting.
Wiring harness between E02 (female) (1) –
L25 (female) (18) – circuit branch end and
ground
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
Between (18) and
310 Troubleshooting by failure code (Display of code), Part 1
Standard value in normal state/Remarks on troubleshooting
Alternator
Running (Throttle:
Wiring harness
Above 1/2)
between E02
Holds in position
L25
Running (Throttle:
Above 1/2)
ground
Holds in position
Engine Voltage
27.5 – 29.5 V
Max. 1.5 V
Resis-
tance
Resis-
tance
Engine Voltage
27.5 – 29.5 V
Max. 1.5 V
WA250, 250PZ-6
Max. 1 z
Min. 1 Mz