Q: What does LGMG fault code SPN 110 FMI 00 mean?

SPN 110 FMI 00 (Cooling / Thermal): Engine Derates / Overheat Siren Blaring Fix: LOGIC: Engine Coolant Temperature Critically High (>105°C). ACTION: Inspect hydraulic-driven or viscous cooling fan operation. Check radiator core fins for compacted quarry dust or straw; verify coolant level and test dual thermostats in water bath for full opening stroke (>82°C).

Question 1

What does LGMG fault code SPN 102 FMI 18 mean?

Accepted Answer

SPN 102 FMI 18 (Air Induction): Sluggish Bucket Loading / Black Exhaust Fix: LOGIC: Boost Pressure Below Expected Target Range Under Load.

ACTION: Pressure test charge air cooler (CAC) and silicone hump hoses with regulated air (<30 PSI). Inspect turbocharger wastegate actuator rod for mechanical seizure; inspect intake piping downstream of the cyclone pre-cleaner.

Question 2

What does LGMG fault code SPN 110 FMI 00 mean?

Accepted Answer

SPN 110 FMI 00 (Cooling / Thermal): Engine Derates / Overheat Siren Blaring Fix: LOGIC: Engine Coolant Temperature Critically High (>105°C).

ACTION: Inspect hydraulic-driven or viscous cooling fan operation. Check radiator core fins for compacted quarry dust or straw; verify coolant level and test dual thermostats in water bath for full opening stroke (>82°C).

Question 3

What does LGMG fault code SPN 157 FMI 00 mean?

Accepted Answer

SPN 157 FMI 00 (Fuel / High Pressure): Hard Engine Knock / Black Smoke / Limp Fix: LOGIC: Rail Pressure Exceeds Upper Safe Limit (Overpressure Spike).

ACTION: Inspect the Fuel Metering Unit (MeUn / PCV) on the high-pressure pump. Test coil resistance (spec: ~2.8–3.5Ω); remove the valve and check the sliding internal spool for fine particle sticking or lacquer build-up from dirty fuel.

Question 4

What does LGMG fault code SPN 157 FMI 04 mean?

Accepted Answer

SPN 157 FMI 04 (Fuel / HPCR): Engine Limp / Severe Lack of Rimpull Fix: LOGIC: Common Rail Pressure Sensor Circuit Voltage Low (Short to Ground).

ACTION: Disconnect the common rail pressure sensor on the fuel rail. Verify 5V reference supply and ground return from the EDC17 ECU. Check signal line resistance to ground (must be infinite Ω); inspect engine harness running near the fuel filter head bracket for rub-through.

Question 5

What does LGMG fault code SPN 190 FMI 02 mean?

Accepted Answer

SPN 190 FMI 02 (Timing / Speed): Erratic Engine RPM / Long Cranking Cycle Fix: LOGIC: Primary Engine Speed (Crankshaft) Sensor Signal Erratic.

ACTION: Remove magnetic inductive sensor from flywheel housing. Clean heavy bellhousing clutch dust and iron filings off the magnetic tip. Check air gap to flywheel tone ring (spec: 1.0 mm ± 0.2 mm); measure coil resistance (~800–1,100Ω).

Question 6

What does LGMG fault code SPN 4364 FMI 18 mean?

Accepted Answer

SPN 4364 FMI 18 (Aftertreatment / SCR): Flashing DEF Lamp / Impending Speed Limit Fix: LOGIC: SCR Catalyst NOx Conversion Efficiency Below Limit.

ACTION: Test DEF fluid quality with an optical refractometer (must read 32.5% ± 0.7%). Remove urea dosing injector from exhaust mixer tube; scrape hard white crystallized urea rocks off nozzle face.

Question 7

What does LGMG fault code SPN 520210 FMI 05 mean?

Accepted Answer

SPN 520210 FMI 05 (Transmission / Shift): Machine Won't Move / Range Drops to Neutral Fix: LOGIC: Forward Directional Solenoid Valve Open Circuit.

ACTION: Disconnect transmission control valve solenoid harness. Measure coil resistance on the Forward proportional clutch solenoid (~18–24Ω); check transmission control lever (DW-3 / ZF WG200 shifter) harness under steering column.

Question 8

What does LGMG fault code SPN 520220 FMI 04 mean?

Accepted Answer

SPN 520220 FMI 04 (Braking / Charge): Brake Warning Buzzer / Long Stopping Distance Fix: LOGIC: Dual-Circuit Brake Air Pressure Sensor Circuit Low.

ACTION: Inspect brake air tank pressure switch on front frame. Test continuity when air builds past 0.55 MPa; check mechanical air compressor unloader valve and drain moisture from primary pneumatic reservoir.

Question 9

What does LGMG fault code SPN 520230 FMI 02 mean?

Accepted Answer

SPN 520230 FMI 02 (Braking / Park): Machine Drags Brakes / Parking Lamp Solid Fix: LOGIC: Parking Brake Pressure Switch Signal Inconsistent.

ACTION: Measure pressure at the parking brake release chamber. Test the 2-wire pressure switch mounted on the handbrake control valve block; trace harness for rock strikes along the rear chassis rail.

Question 10

What does LGMG fault code SPN 520260 FMI 04 mean?

Accepted Answer

SPN 520260 FMI 04 (Steering / Priority): Heavy Steering at Low Idle / Whining Pump Fix: LOGIC: Steering Priority Valve Pilot Pressure Switch Short to Ground.

ACTION: Inspect priority valve manifold on center articulation joint. Test dynamic pressure on the load-sense line; check wiring harness passing through the center articulation hitch for mechanical pinching.

LGMG Fault Codes

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Code	System	Symptom	Full fix
SPN 102 FMI 18	Air Induction	Sluggish Bucket Loading / Black Exhaust	View fix
SPN 110 FMI 00	Cooling / Thermal	Engine Derates / Overheat Siren Blaring	View fix
SPN 157 FMI 00	Fuel / High Pressure	Hard Engine Knock / Black Smoke / Limp	View fix
SPN 157 FMI 04	Fuel / HPCR	Engine Limp / Severe Lack of Rimpull	View fix
SPN 190 FMI 02	Timing / Speed	Erratic Engine RPM / Long Cranking Cycle	View fix
SPN 4364 FMI 18	Aftertreatment / SCR	Flashing DEF Lamp / Impending Speed Limit	View fix
SPN 520210 FMI 05	Transmission / Shift	Machine Won't Move / Range Drops to Neutral	View fix
SPN 520220 FMI 04	Braking / Charge	Brake Warning Buzzer / Long Stopping Distance	View fix
SPN 520230 FMI 02	Braking / Park	Machine Drags Brakes / Parking Lamp Solid	View fix
SPN 520260 FMI 04	Steering / Priority	Heavy Steering at Low Idle / Whining Pump	View fix
SPN 520270 FMI 08	Transmission / Speed	Speedometer Dead / Auto-Shift Locked in 1st	View fix
SPN 520280 FMI 05	Hydraulics / Fan	Hydraulic Oil Temp High / Fan Won't Reverse	View fix
SPN 520290 FMI 04	Electrical / Charging	Batteries Won't Charge / Gauges Flicker	View fix
SPN 636 FMI 08	Timing / Cam	Rough Idle / Cylinder Balance Faults	View fix