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SPN 1081 — "Wait to Start" Lamp

Safe to driveDrivable, but watch it yourself

J1939 code SPN 1081. Below — how the fault is worded at the factory by Ford Trucks, International, KAMAZ, MAZ and YaMZ, and what the second half of the code (FMI) means in the standard.

Ford TrucksInternationalKAMAZMAZYaMZ

Ford Trucks

Ford Trucks/Ecotorq writes fault numbers in its own format: the code in the table below is a Ford code (hexadecimal, zero-padded), not a J1939 SPN. It matches the standard only where the signal itself is standard, and usually matches the title of this page by digit alone.

FMI 2Wiring of brake level selector defective, brake lever selector defective, inputs of connected ECU defective

International

FMI 4Wait to Start Lamp
FMI 6Wait to Start Lamp

KAMAZ

FMI 2Cold start lamp
FMI 3Cold start lamp
FMI 4Cold start lamp
FMI 12Cold start lamp

MAZ

FMI 2Cold-start lamp circuit fault - Overheating. Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.
FMI 3Cold-start lamp circuit fault - Short to battery positive. Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.
FMI 4Cold-start lamp circuit fault - Short to ground. Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.
FMI 12Cold-start lamp circuit fault - Open circuit. Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.

YaMZ

FMI 2Cold start lamp circuit fault (Overheating). Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.
FMI 3Cold start lamp circuit fault (Short to battery positive). Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.
FMI 4Cold start lamp circuit fault (Short to ground). Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.
FMI 12Cold start lamp circuit fault (Open circuit). Blink code: 3-3-2. Repair: Check the cold start lamp and its wiring.

What FMI means in J1939

SPN 1081 FMI 21081/2 · 1081.2data erratic or intermittent
SPN 1081 FMI 31081/3 · 1081.3voltage above normal or shorted high
SPN 1081 FMI 41081/4 · 1081.4voltage below normal or shorted to ground
SPN 1081 FMI 61081/6 · 1081.6current above normal or grounded circuit
SPN 1081 FMI 121081/12 · 1081.12faulty 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

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