Failure Code [Ca221] Ambient Air Press. Sensor High Error - Komatsu PC130-8 Shop Manual

Hydraulic excavator

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Failure code [CA221] Ambient air press. sensor high error

Failure code

• High voltage was detected in ambient pressure sensor circuit.

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

Problem that

• Output drops.

• Signal voltage of ambient pressure sensor can be checked with monitoring function.

(Code: 37401 Ambient pressure sensor voltage)

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

Defective sensor power sup-

Defective atmospheric pres-

(Internal trouble)

Possible causes

Disconnection in wiring har-

and standard

value in normal

(Disconnection in wiring or

defective contact in connec-

Ground fault in wiring har-

(Short circuit with GND cir-

Ambient air press. sensor high error

(Engine controller system)

Standard value in normal state/Remarks on troubleshooting

If failure code [CA227] is indicated, carry out troubleshooting for it

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

and carry out troubleshooting.

Between (3) – (1)

Between (2) – (1)

Sensor voltage is measured with wiring harness connected.

Accordingly, if voltage is abnormal, check wiring harness and con-

troller, too, for another cause of trouble, and then judge.

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

ing without turning starting switch ON.