Failure Code [Ca122] Charge Air Press Sensor High Error - Komatsu PC130-8 Shop Manual

Hydraulic excavator

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Failure code [CA122] Charge air press sensor high error

Failure code

• High voltage was detected in charge (boost) pressure sensor circuit.

• Fixes charge (boost) pressure (400 kPa {4.08 kg/cm

Problem that

• Acceleration performance of engine drops.

• Signal voltage of charge (boost) pressure sensor can be checked with monitoring function.

(Code: 36501 Boost pressure sensor voltage).

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

Defective sensor power sup-

Defective charge (boost)

pressure sensor

(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-

Charge air press sensor high error

(Engine controller system)

}) and continues operation.

Standard value in normal state/Remarks on troubleshooting

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

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

start engine and carry out troubleshooting.

Between (3) – (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.