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SPN 520193 — factory code KAMAZ, MAZ, Volvo and others

Safe to driveDrivable, but watch it yourself

Updated: 2026-11-10

SPN 520193 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by KAMAZ, MAZ, Volvo and YaMZ, and what the second half of the code (FMI) means.

KAMAZMAZVolvoYaMZ

KAMAZ engine (J1939)

FMI 3Air flow sensor: sensitivity deviation
FMI 4Air flow sensor: sensitivity deviation

MAZ

FMI 3Mass air flow sensor reading error - Air flow above allowed. Blink code: 2-3-4. Repair: Check the mass air flow sensor and its wiring.
FMI 4Mass air flow sensor reading error - Air flow below allowed. Blink code: 2-3-4. Repair: Check the mass air flow sensor and its wiring.

Volvo

FMI 5LCM output current to the lamp is below 0.1 A. Open supply wire between the LCM and the lamp, open wire between the lamp and the ground point, or lamp failure.
FMI 6LCM output current to the lamp is above 3.1 A. Wire shorted to ground between the LCM and the lamp. Possibly several lamps are connected, or a higher-wattage lamp is installed.

YaMZ

FMI 3Mass air flow sensor reading fault (Air flow above allowable limit). Blink code: 2-3-4. Repair: Check the mass air flow sensor and its wiring.
FMI 4Mass air flow sensor reading fault (Air flow below allowable limit). Blink code: 2-3-4. Repair: Check the mass air flow sensor and its wiring.

What FMI means in J1939

SPN 520193 FMI 3520193/3 · 520193.3voltage above normal or shorted high
SPN 520193 FMI 4520193/4 · 520193.4voltage below normal or shorted to ground
SPN 520193 FMI 5520193/5 · 520193.5current below normal or open circuit
SPN 520193 FMI 6520193/6 · 520193.6current above normal or grounded circuit

Can I keep driving

Safe to drive. Below — how much time you have and what happens if you keep going.

What happens if you keep driving

Time you have: Drivable, but watch it yourself

This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.

You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.

Nearby: other

Related codes

Makes with this code

KAMAZMAZYaMZVolvo

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