Komatsu Fault Code
Free · no signupSPN 702 FMI 3
Attachment Hydraulics Dead
System
Electrical / Controls
Symptom
Attachment Hydraulics Dead
Diagnosis & fix steps
LOGIC: Auxiliary Flow Control Solenoid Circuit Short to Power.
ACTION: Disconnect auxiliary proportional valve harness at the main control valve. Check for 24V short across terminal pins and inspect harness bundle where it passes the hydraulic pump compartment wall.
Red Seal field insights
Driver Protection: The pump controller shuts off power to the proportional driver channel to prevent burning internal output transistors when short-to-battery voltage is sensed.
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