LGCM Fault Code

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E05 / SPN 91 FMI 04

Engine Defaults to Low Idle / Dial Dead

System

Throttle / Engine

Symptom

Engine Defaults to Low Idle / Dial Dead

Diagnosis & fix steps

LOGIC: Electronic Rotary Throttle Potentiometer Signal Low. ACTION: Access throttle dial on side console. Check 5V reference supply and ground; sweep dial and measure center signal pin output (spec: 0.5V low idle to 4.5V high idle). Replace worn carbon-track dial.

Red Seal field insights

Dust Ingress: Open-cab small machines expose the console throttle potentiometer to quarry dust and rain, grinding away the carbon wiper track and dropping signal voltage.

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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