Failure Code [B@Bcns] Engine: Overheat - Komatsu WA250-6 Shop Manual

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310 Troubleshooting by failure code (Display of code), Part 1

Failure code [B@BCNS] Engine: Overheat

Failure code

• While engine was running, engine coolant temperature sensor signal circuit detected engine coolant

• Limits fuel injection until coolant temperature lowers to operating range.

machine monitor

• Turns central warning lamp and caution buzzer ON.

Problem that

• Engine output decreases.

• Engine coolant temperature can be checked with monitoring function.

(Monitoring code: ENGINE – 04104 – COOLANT TEMP (°C))

Engine coolant overheat

(when system is normal)

Possible causes

and standard

Defective engine coolant

value in normal

temperature sensor system

3 Defective engine controller

WA250, 250PZ-6

Engine: Overheat

(Engine controller system)

Engine coolant may be overheating. Remove cause of overheat.

If cause 1 is not detected, engine coolant temperature sensor sys-

tem may be defective. Carry out troubleshooting for failure codes

[CA144] and [CA145].

If causes 1 and 2 are not detected, engine controller may be defec-

tive. Carry out troubleshooting for failure codes [CA144] and

Standard value in normal state/Remarks on troubleshooting

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Wa250pz-6 75001