What does SPN 523355 FMI 2 (523355/2) mean?

SPN 523355: data erratic or intermittent.

What does SPN 523355 FMI 3 (523355/3) mean?

SPN 523355: voltage above normal or shorted high.

SPN 523355 — factory code KAMAZ, MAZ and YaMZ

Q: Can I keep driving with code SPN 523355?

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

Safe to driveDrivable, but watch it yourself

SPN 523355 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 and YaMZ, and what the second half of the code (FMI) means.

KAMAZ MAZ YaMZ

KAMAZ

FMI 3	Injector driver chip B
FMI 4	Injector driver chip B
FMI 12	Injector driver chip B

MAZ

FMI 2	Injector driver chip fault - CY33X timeout. Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.
FMI 3	Injector driver chip fault - CY33X parity error. Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.
FMI 4	Injector driver chip fault - CY33X program error. Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.
FMI 12	Injector driver chip fault - CY33X check error. Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.

YaMZ

FMI 2	Injector driver IC fault (CY33X timeout). Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.
FMI 3	Injector driver IC fault (CY33X parity error). Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.
FMI 4	Injector driver IC fault (CY33X program error). Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.
FMI 12	Injector driver IC fault (CY33X check error). Blink code: 1-5-3. The engine will not start. Power will be reduced. Repair: Replace the ECU.

What FMI means in J1939

SPN 523355 FMI 2523355/2 · 523355.2	data erratic or intermittent
SPN 523355 FMI 3523355/3 · 523355.3	voltage above normal or shorted high
SPN 523355 FMI 4523355/4 · 523355.4	voltage below normal or shorted to ground
SPN 523355 FMI 12523355/12 · 523355.12	faulty device or component

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

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.