Komatsu Fault Code

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168-4

Controller "Brown Out"

System

Electrical

Symptom

Controller "Brown Out"

Diagnosis & fix steps

LOGIC: Battery Potential / System Voltage Low. ACTION: Load test batteries and inspect the main battery relay (disconnect) for pitted contacts.

Red Seal field insights

Specs: Must maintain >18V during cranking on 24V systems. PRO-TIP: Pitted contacts cause voltage drops that reset the PLC.

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