What does SPN 1351 FMI 0 (1351/0) mean?

Air Compressor State: data above normal range (most severe level).

What does SPN 1351 FMI 2 (1351/2) mean?

Air Compressor State: data erratic or intermittent.

SPN 1351 — Air Compressor State

Q: Can I keep driving with code SPN 1351 (Air Compressor State)?

Do not drive. Stop as soon as it’s safe to do so — don’t keep going.

Do not driveMinutes

J1939 code SPN 1351. Below — how the fault is worded at the factory by KAMAZ, MAZ, Meritor (ex-WABCO), SITRAK and YaMZ, and what the second half of the code (FMI) means in the standard.

KAMAZ MAZ Meritor (ex-WABCO)SITRAK YaMZ

KAMAZ

FMI 2	Air conditioning power stage
FMI 3	Air conditioning power stage
FMI 4	Air conditioning power stage
FMI 12	Air conditioning power stage

MAZ

FMI 2	A/C compressor driver circuit fault - Overheating. Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.
FMI 3	A/C compressor driver circuit fault - Short to battery positive. Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.
FMI 4	A/C compressor driver circuit fault - Short to ground. Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.
FMI 12	A/C compressor driver circuit fault - Open circuit. Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.

Meritor (ex-WABCO)

FMI 0	EAPU - Compressor/ Overpressure Fault
FMI 11	EAPU - Compressor/ Critical Air Consumption

SITRAK

FMI 3	A/C compressor circuit short to battery. Scan tool code: P0647. Effect: Torque may be limited.
FMI 4	A/C compressor circuit short to ground. Scan tool code: P0646. Effect: Torque may be limited.
FMI 5	Open load in the A/C compressor circuit. Scan tool code: P0645. Effect: Torque may be limited.
FMI 6	Over-temperature of the A/C compressor powerstage. Scan tool code: P0645. Effect: Torque limited, the engine may shut down.

YaMZ

FMI 2	Air conditioning control driver circuit fault (Overheating). Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.
FMI 3	Air conditioning control driver circuit fault (Short to battery positive). Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.
FMI 4	Air conditioning control driver circuit fault (Short to ground). Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.
FMI 12	Air conditioning control driver circuit fault (Open circuit). Blink code: 3-1-3. Repair: Check the air conditioner and its wiring.

What FMI means in J1939

SPN 1351 FMI 01351/0 · 1351.0	data above normal range (most severe level)
SPN 1351 FMI 21351/2 · 1351.2	data erratic or intermittent
SPN 1351 FMI 31351/3 · 1351.3	voltage above normal or shorted high
SPN 1351 FMI 41351/4 · 1351.4	voltage below normal or shorted to ground
SPN 1351 FMI 51351/5 · 1351.5	current below normal or open circuit
SPN 1351 FMI 61351/6 · 1351.6	current above normal or grounded circuit
SPN 1351 FMI 111351/11 · 1351.11	root cause not known
SPN 1351 FMI 121351/12 · 1351.12	faulty device or component

Can I keep driving

Do not drive. Stop as soon as it’s safe to do so — don’t keep going.

What happens if you keep driving

Time you have: Minutes

Part of the brake circuit or ABS/EBS is out of service. The pedal may still feel normal — until the first emergency stop or descent.

Next comes longer stopping distance, a skid on a slick surface, failure on a long downgrade. This is the case where "I will take it slow" does not work.

What to check on the spot

Let the air system build to working pressure and listen for leaks. Don’t drive with faulty brakes.

Nearby: brakes

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