Error Code [227] (Abnormality In Engine Speed Sensor) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING

Error code [227] (Abnormality in engine speed sensor)

User code Error code
– 227
Contents of
• Normal pulse signals are not input to the signal circuit of the engine speed sensor.
trouble
Action of • Controls as if in the E-mode.
controller • If the cause of the failure disappears, the system resets itself.
Problem that
appears on • The output power is a little low (The engine speed cannot be sensed).
machine
Related • The input state (ON/OFF) from the engine speed sensor can be checked with the monitoring function.
information (Code: 010, by 10 rpm)
Defective engine speed
1 sensor (Internal short cir-
cuit or disconnection)
Defective adjustment of
2
engine speed sensor
Disconnection in wiring
Possible causes
harness (Disconnection in
and standard 3
wiring harness or defective
value in normal
contact in connector)
state
Short circuit with power
4 source in wiring harness
(Contact with 24-V circuit)
Defective governor and
5
pump controller
20-344
(1)
Abnormality in engine speed sensor
Trouble
(Governor and pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between (1) and chassis ground
See TESTING AND ADJUSTING, Adjusting engine speed sensor.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between C01 (female) (40) and
E04 (female) (1)
Wiring harness between C01 (female) (29),
(39) and E04 (female) (2)
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between C01 (female) (40) – E04 (female) (1)
wiring harness and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between (40) and (29), (39)
Between (40) and chassis ground
E04 (male)
Between (1) and (2)
C02
[227]
Resistance
500 – 1,000 z
Min. 1 Mz
Max. 1 z
Resistance
Max. 1 z
Resistance
Voltage Max. 1 V
Resistance
500 – 1,000 z
Min. 1 Mz
PC130-7