Hitachi Fault Code
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Multiple Random Sensor Errors on DLU
System
Electrical
Symptom
Multiple Random Sensor Errors on DLU
Diagnosis & fix steps
LOGIC: System Battery Supply Voltage Ripple Exceeds Limit.
ACTION: Perform an AC ripple voltage test on the main 24V brushless alternator output (must be <0.5V AC). Check for failed internal alternator rectifier diodes or loose battery studs.
Red Seal field insights
Electrical Noise: Excessive AC voltage ripple from failing alternator diodes corrupts analog 5V sensor telemetry and J1939 data bus packets across machine controllers.
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