Do not driveMinutes
J1939 code SPN 110. Below — how the fault is worded at the factory by DAF, Dongfeng, Foton, Isuzu, KAMAZ, MAZ, Renault Trucks, SITRAK, YaMZ and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.
DAFDongfengFotonIsuzuKAMAZMAZRenault TrucksSITRAKYaMZZF AS-Tronic
| FMI 0 | Coolant temperature F566 too high, engine protection active |
| FMI 2 | Coolant temperature F566 out of range at ignition on (extended period) |
| FMI 3 | Coolant temperature F566 short to power supply at ECU pin A49 (extended period) |
| FMI 4 | Coolant temperature F566 short to ground at ECU pin A49 (extended period) |
| FMI 15 | Coolant temperature F566 temperature too high |
| FMI 0 | Engine coolant temperature too high |
| FMI 2 | Incorrect coolant temperature signal. Scan tool code: P0116. |
| FMI 3 | Short circuit to power or open circuit of the coolant temperature sensor |
| FMI 4 | Short circuit to ground of the coolant temperature sensor |
| FMI 15 | Engine coolant temperature too high (minor) |
| FMI 16 | Engine coolant temperature too high (minor) |
| FMI 15 | Coolant temperature above allowed limit |
| FMI 0 | Overheat (P1173) |
| FMI 3 | Engine coolant temperature sensor fault (high voltage fault) (P0118) |
| FMI 4 | Engine coolant temperature sensor fault (low voltage fault) (P0117) |
| FMI 0 | Coolant temperature sensor: physical range limit. K-line code on KamAZ-5490: MR2 12122. |
| FMI 1 | Coolant temperature sensor: physical range limit |
| FMI 2 | Coolant temperature sensor |
| FMI 3 | Coolant temperature sensor. K-line code on KamAZ-5490: MR2 11515. |
| FMI 4 | Coolant temperature sensor. K-line code on KamAZ-5490: MR2 11516. |
| FMI 12 | Coolant temperature sensor |
| FMI 14 | Coolant temperature (from PLD/MR2). K-line code on KamAZ-5490: ADM3 10914. |
| FMI 15 | ⚠ Coolant overheating |
| FMI 2 | Coolant temperature sensor circuit fault - Reading inconsistent with the oil temperature reading. Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 3 | Coolant temperature sensor circuit fault - Voltage above allowed. Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 4 | Coolant temperature sensor circuit fault - Voltage below allowed. Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 12 | Coolant temperature sensor circuit fault - CAN bus signal implausible. Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 15 | Coolant overheating - Overheating. Blink code: 2-4-2. Repair: Check the radiator. |
| FMI 3 | Coolant temperature sensor — short to positive (5 V or battery voltage). Repair: Check the sensor and the wiring (J 1/17, J 1/26). Check the sensor and the engine wiring (A 1, A 30). |
| FMI 4 | Coolant temperature sensor — short to ground. Repair: Check the sensor and the wiring (J 1/17, J 1/26). Check the sensor and the engine wiring (A 1, A 30). |
| FMI 5 | Coolant temperature sensor — open circuit; check the engine wiring and the sensor itself. Repair: Check the sensor and the wiring (J 1/17, J 1/26). Check the sensor and the engine wiring (A 1, A 30). |
| FMI 15 | Coolant temperature above normal. Repair: Check the sensor and the engine wiring (A 1, A 30). |
| FMI 0 | Coolant temperature above torque limit class 2 |
| FMI 2 | Coolant warm-up not plausible: the temperature does not reach the threshold in time. Scan tool code: P0116. |
| FMI 3 | High voltage on coolant temperature sensor |
| FMI 4 | Low voltage on coolant temperature sensor |
| FMI 15 | Coolant temperature above torque limit class 1 |
| FMI 17 | Coolant warm-up not plausible: the temperature does not reach the threshold in time. Scan tool code: P0116. |
| FMI 18 | Coolant warm-up not plausible: the temperature does not reach the threshold in time. Scan tool code: P0116. |
| FMI 19 | Timeout of the coolant temperature CAN frame. Effect: Fan and warm-up control may misbehave. |
| FMI 20 | Coolant overheating downstream of the engine, threshold 1. Scan tool code: P0115. Effect: Fan and warm-up control may misbehave. |
| FMI 21 | Coolant overheating downstream of the engine, threshold 2. Scan tool code: P0115. Effect: Fan and warm-up control may misbehave. |
| FMI 22 | Coolant overheating downstream of the engine, threshold 3. Scan tool code: P0115. Effect: Fan and warm-up control may misbehave. |
| FMI 2 | Coolant temperature sensor circuit fault (Reading inconsistent with oil temperature reading). Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 3 | Coolant temperature sensor circuit fault (Voltage above allowable limit). Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 4 | Coolant temperature sensor circuit fault (Voltage below allowable limit). Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 12 | Coolant temperature sensor circuit fault (CAN bus signal implausible). Blink code: 2-4-1. Power will be reduced. Repair: Check the coolant temperature sensor and its wiring. |
| FMI 15 | Coolant overheating. Blink code: 2-4-2. Repair: Check the radiator. |
ZF AS-Tronic uses its own fault numbering: the number in the table below is an internal ZF code, not a J1939 SPN. It matches the title of this page by digit only and means something different.
| FMI 0 | ZF-CAN bus timeout. |
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.
This is an electrical fault: the sensor or its wiring is lying, not the cooling system. The temperature gauge is unreliable now and the fan may not kick in on time. Watch the coolant level and keep the engine off load on long climbs.
Let the engine cool — never open the expansion tank cap while hot. Then check the level and the hoses.
If the value really did go out of range, rather than a sensor circuit being broken, these normally light up after it:
They are not fixed separately — they go out together with this one. The list is deliberately short: only the links the reference is sure about.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.