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SPN 1088 — Service Brake Air Pressure, Circuit #2

Do not driveMinutes

J1939 code SPN 1088. Below — how the fault is worded at the factory by International and KAMAZ, and what the second half of the code (FMI) means in the standard.

International

FMI 0Service Brake Air Pressure Circuit #2 — Secondary Air Tank Sensor reading above normal range
FMI 1Service Brake Air Pressure Circuit #2 — Secondary Air Tank Sensor reading below normal range

KAMAZ

FMI 4Air pressure sensor circuit, circuit 2, shorted to ground
FMI 5Air pressure sensor circuit, circuit 2, open
FMI 7Air pressure sensor signal, circuit 2, out of range

What FMI means in J1939

SPN 1088 FMI 01088/0 · 1088.0data above normal range (most severe level)
SPN 1088 FMI 11088/1 · 1088.1data below normal range (most severe level)
SPN 1088 FMI 41088/4 · 1088.4voltage below normal or shorted to ground
SPN 1088 FMI 51088/5 · 1088.5current below normal or open circuit
SPN 1088 FMI 71088/7 · 1088.7mechanical system not responding

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

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