Do not driveMinutes
J1939 code SPN 985. Below — how the fault is worded at the factory by KAMAZ, MAZ, SITRAK and YaMZ, and what the second half of the code (FMI) means in the standard.
| FMI 2 | Air conditioning control signal via CAN |
| FMI 12 | Air conditioning control signal via CAN |
| FMI 2 | A/C control signal error on CAN - Implausible CAN bus signal. Blink code: 3-1-3. Repair: Check the air conditioner connection to the other CAN devices. |
| FMI 12 | A/C control signal error on CAN - CAN bus incoming message timeout. Blink code: 3-1-3. Repair: Check the air conditioner connection to the other CAN devices. |
| FMI 14 | Implausible air conditioning switch signal on the CAN bus. Effect: Loss of communication with the modules, some functions are disabled. |
| FMI 19 | Timeout of the air conditioning switch signal on the CAN bus. Effect: Loss of communication with the modules, some functions are disabled. |
| FMI 2 | Air conditioning control signal fault on CAN line (Implausible CAN bus signal). Blink code: 3-1-3. Repair: Check the air conditioner connection to the other CAN devices. |
| FMI 12 | Air conditioning control signal fault on CAN line (CAN bus message timeout). Blink code: 3-1-3. Repair: Check the air conditioner connection to the other CAN devices. |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
The engine is already past its temperature limit. An aluminium head goes fast: first the geometry warps, then the gasket burns through.
Next comes a blown head gasket, a damaged head and, at worst, a cracked block. Shut it down and let it cool — never open the expansion tank cap while hot.
Let the engine cool — never open the expansion tank cap while hot. Then check the level and the hoses.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.