Failure Code [Ca238] Ne Speed Sensor Sup. Volt. Error - Komatsu PC130-8 Shop Manual

Hydraulic excavator

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Failure code [CA238] Ne speed sensor sup. volt. error

Failure code

• Abnormality occurred in Ne speed sensor power supply (5 V) circuit.

• Controls Ne speed sensor with signals of Bkup speed sensor.

Problem that

• Running engine stops (when Bkup speed sensor is also abnormal).

• Stopped engine cannot be started (when Bkup speed sensor is also abnormal).

• Method of reproducing failure code: Turn starting switch ON.

Defective Ne speed sensor

(Internal trouble)

Disconnection in wiring har-

ness (Disconnection in wiring

or defective contact in con-

Possible causes

and standard

value in normal

Ground fault in wiring har-

ness (Short circuit with GND

Short circuit in wiring har-

ness (with another wiring

5 Defective engine controller

Ne speed sensor sup. volt. error

(Engine controller system)

Standard value in normal state/Remarks on troubleshooting

a Prepare with starting switch OFF, then carry out troubleshoot-

ing without turning starting switch ON.

Disconnect devices

at right in order. If

error code disap-

pears when a device

Ne speed sensor

is disconnected, that

device has a defect

a Prepare with starting switch OFF, then carry out troubleshoot-

ing without turning starting switch ON.