Do not driveTo the nearest safe stop
SPN 523613 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by KAMAZ, MAZ and YaMZ, and what the second half of the code (FMI) means.
| FMI 1 | Pump delivery at idle exceeds maximum |
| FMI 2 | Metering unit in over-delivery mode: implausible setpoint |
| FMI 3 | ⚠ Rail pressure above maximum |
| FMI 4 | ⚠ Rail pressure below minimum |
| FMI 5 | Rail: positive regulator deviation at set delivery rate |
| FMI 7 | Injection pump metering unit current below minimum permissible |
| FMI 15 | Rail: positive deviation with pump delivery exceeded |
| FMI 16 | Rail: positive pressure deviation exceeded |
| FMI 17 | Rail: negative deviation at minimum delivery |
| FMI 18 | Rail: pressure fluctuations higher than expected |
| FMI 0 | Fault in the high-pressure pump metering unit control - Maximum fuel rail pressure exceeded. Blink code: 2-5-9. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 1 | Fault in the high-pressure pump metering unit control - Fuel metering unit fault at idle. Blink code: 2-5-8. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 2 | Fault in the high-pressure pump metering unit control - Incorrect fuel metering unit setpoint. Blink code: 2-5-5. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 3 | Fault in the high-pressure pump metering unit control - Fuel rail pressure above maximum. Blink code: 2-5-3. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 4 | Fault in the high-pressure pump metering unit control - Fuel rail pressure below minimum. Blink code: 2-5-3. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 5 | Fault in the high-pressure pump metering unit control - Maximum positive deviation exceeded relative to the target fuel rate. Blink code: 2-5-2. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 7 | Fault in the high-pressure pump metering unit control - Metering unit current below minimum. Blink code: 2-5-4. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 15 | Fault in the high-pressure pump metering unit control - Maximum positive deviation exceeded relative to the target fuel rate. Blink code: 2-5-6. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 16 | Fault in the high-pressure pump metering unit control - Maximum positive deviation exceeded. Blink code: 2-5-1. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 17 | Fault in the high-pressure pump metering unit control - Maximum negative deviation exceeded. Blink code: 2-5-4. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 18 | Fault in the high-pressure pump metering unit control - Fuel rail pressure drop. Blink code: 2-5-7. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 0 | High-pressure fuel pump metering unit control fault (Maximum fuel rail pressure exceeded). Blink code: 2-5-9. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 1 | High-pressure fuel pump metering unit control fault (Fuel metering unit malfunction at idle). Blink code: 2-5-8. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 2 | High-pressure fuel pump metering unit control fault (Incorrect fuel metering unit setting). Blink code: 2-5-5. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 3 | High-pressure fuel pump metering unit control fault (Fuel rail pressure above maximum). Blink code: 2-5-3. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 4 | High-pressure fuel pump metering unit control fault (Fuel rail pressure below minimum). Blink code: 2-5-3. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 5 | High-pressure fuel pump metering unit control fault (Maximum positive deviation exceeded relative to target fuel flow). Blink code: 2-5-2. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 7 | High-pressure fuel pump metering unit control fault (Metering unit current below minimum). Blink code: 2-5-4. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 15 | High-pressure fuel pump metering unit control fault (Maximum positive deviation exceeded relative to target fuel flow). Blink code: 2-5-6. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 16 | High-pressure fuel pump metering unit control fault (Maximum positive deviation exceeded). Blink code: 2-5-1. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 17 | High-pressure fuel pump metering unit control fault (Maximum negative deviation exceeded). Blink code: 2-5-4. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
| FMI 18 | High-pressure fuel pump metering unit control fault (Fuel rail pressure drop). Blink code: 2-5-7. Power will be reduced. Repair: Check the components and connections of the high- and low-pressure hydraulic circuits. |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
The code is flagged critical: the manufacturer considers it unsafe to keep driving without checking.
This code alone cannot say what will fail next, so stop at the first safe opportunity and look at it on the spot.
That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.