Failure Code [Ca386] Sensor Sup. 1 Volt. High Error - Komatsu PC130-8 Shop Manual

Hydraulic excavator

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Failure code [CA386] Sensor sup. 1 volt. high error

Failure code

• High voltage was detected in sensor power supply 1 (5 V) circuit.

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

• Sets atmospheric pressure sensor to default value (52.44 kPa {0.53 kg/cm

• Fixes charge pressure sensor value (400 kPa {4.08 kg/cm

• Limits output and continues operation (Limits common rail pressure).

Problem that

• Output drops.

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

1 Defective related system

Defective sensor (Internal

Disconnection in wiring har-

(Disconnection in wiring or

defective contact in connec-

Possible causes

and standard

value in normal

Ground fault in wiring har-

(Short circuit with GND cir-

Short circuit in wiring har-

(With another wiring har-

Defective engine controller

Sensor sup. 1 volt. high error

(Engine controller system)

Standard value in normal state/Remarks on troubleshooting

If another failure code is indicated, carry out troubleshooting for it.

a Prepare with starting switch OFF, then turn starting switch ON

and carry out troubleshooting.

Bkup speed sensor

Disconnect devices

at right in order. If

pressure sensor

error code disap-

pears when a device

Charge pressure

is disconnected, that

device has a defect

pressure sensor

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

ing without turning starting switch ON.