Safe to driveEnough to reach the yard
J1939 code SPN 3464. Below — how the fault is worded at the factory by MAZ and YaMZ, and what the second half of the code (FMI) means in the standard.
| FMI 0 | Exhaust throttle position control error, deviation from target - Maximum positive deviation exceeded. Blink code: 6-8-2. Repair: Check the exhaust throttle and its wiring. |
| FMI 1 | Exhaust throttle position control error, deviation from target - Maximum negative deviation exceeded. Blink code: 6-8-2. Repair: Check the exhaust throttle and its wiring. |
| FMI 2 | Intake throttle driver circuit fault - Overheating. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
| FMI 3 | Intake throttle driver circuit fault - CJ230 driver error. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
| FMI 4 | Intake throttle driver circuit fault - Valve control current exceeded. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
| FMI 7 | Exhaust throttle valve stuck - Valve/damper stuck. Blink code: 6-8-3. Repair: Check the exhaust throttle and its wiring. |
| FMI 12 | Intake throttle driver circuit fault - Current limited due to overheating. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
| FMI 0 | Exhaust throttle valve position control fault, deviation from target (Maximum positive deviation exceeded). Blink code: 6-8-2. Repair: Check the exhaust throttle and its wiring. |
| FMI 1 | Exhaust throttle valve position control fault, deviation from target (Maximum negative deviation exceeded). Blink code: 6-8-2. Repair: Check the exhaust throttle and its wiring. |
| FMI 2 | Intake air throttle valve driver circuit fault (Overheating). Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
| FMI 3 | Intake air throttle valve driver circuit fault (CJ230 driver error). Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
| FMI 4 | Intake air throttle valve driver circuit fault (Valve control current exceeded). Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
| FMI 7 | Exhaust throttle valve seized (Valve seized). Blink code: 6-8-3. Repair: Check the exhaust throttle and its wiring. |
| FMI 12 | Intake air throttle valve driver circuit fault (Current limited due to overheating). Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring. |
Safe to drive. Below — how much time you have and what happens if you keep going.
Boost is not reaching its target: turbo, intercooler or intake. The engine compensates with mixture and runs hotter than usual.
You will lose pull, burn more fuel and add overheating on long climbs. If you hear a whine or a whistle from the turbo, stop — the wheel is breaking up.
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.
That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.
Inspect the air filter and charge-air hoses: leaks and cracks produce exactly these codes.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.