Komatsu Fault Code

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SPN 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.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

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Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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