Komatsu Fault Code

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DHPAMA

Hydraulic Drift / Error Code Active

System

Hydraulic Monitoring

Symptom

Hydraulic Drift / Error Code Active

Diagnosis & fix steps

LOGIC: Front Pump Pressure Sensor Signal Abnormal. ACTION: Check 5V sensor supply and output voltage at front pump pressure transducer pin. Swap harness leads with rear pump sensor to confirm whether fault follows sensor or wiring.

Red Seal field insights

Machine ECU uses front pump pressure feedback to calculate TVC and LS-EPC current outputs. Invalid readings cause erratic pump displacement control.

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