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SPN 3464 — Throttle Actuator Control Command 1

Safe to driveEnough to reach the yard

Updated: 2026-11-14

J1939 code SPN 3464. Below — how the fault is worded at the factory by Cummins ISB, KAMAZ-5490, MAZ and YaMZ, and what the second half of the code (FMI) means in the standard.

How to check it yourself

The throttle actuator command (intake or exhaust, per the factory table). The unit sets the throttle position, the actuator moves it, and gives feedback.

What it should read

Throttle position on commandmatches the set value — checked per diagnostics
Throttle and actuator travel without stickingper the manufacturer's manual

Check order

  1. Check whether the throttle sticks: with the engine off turn it by hand (where access allows); the movement should be even, without sticking.
  2. FMI 0, 1, 2, 3 (regulation error, deviation): check the throttle actuator, the connector and the throttle for carbon.
  3. FMI 2, 3, 4, 6 (KamAZ: internal fault of the control unit): first check the actuator's connector and supply; if it repeats after a reset — the control unit per the manual.

Common causes — from most to least frequent

  1. Carbon and dirt on the throttle.
  2. Throttle actuator or its connector.
  3. Internal fault of the control unit.

Cummins ISBKAMAZ-5490MAZYaMZ

Cummins ISB 6.7 engine

FMI 3Electronic throttle control actuator driver circuit voltage high
FMI 4Electronic throttle control actuator driver circuit voltage low
FMI 7Electronic throttle control actuator, mechanical system not responding

KAMAZ-5490 (Mercedes, K-line)

FMI is per the block maker's own table, not the J1939 table below.

FMI 2Intake throttle high-side driver: internal control unit error. K-line code on KamAZ-5490: MR2 14224.
FMI 3Intake throttle control signal: short to high. K-line code on KamAZ-5490: MR2 14200.
FMI 4Intake throttle control signal: short to low. K-line code on KamAZ-5490: MR2 14201.
FMI 6Intake throttle control signal: commanded flow too high. K-line code on KamAZ-5490: MR2 12407.

MAZ

FMI 0Exhaust 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 1Exhaust 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 2Intake throttle driver circuit fault - Overheating. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring.
FMI 3Intake throttle driver circuit fault - CJ230 driver error. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring.
FMI 4Intake throttle driver circuit fault - Valve control current exceeded. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring.
FMI 7Exhaust throttle valve stuck - Valve/damper stuck. Blink code: 6-8-3. Repair: Check the exhaust throttle and its wiring.
FMI 12Intake throttle driver circuit fault - Current limited due to overheating. Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring.

YaMZ

FMI 0Exhaust 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 1Exhaust 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 2Intake air throttle valve driver circuit fault (Overheating). Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring.
FMI 3Intake air throttle valve driver circuit fault (CJ230 driver error). Blink code: 6-7-2. Repair: Check the intake throttle actuator and its wiring.
FMI 4Intake 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 7Exhaust throttle valve seized (Valve seized). Blink code: 6-8-3. Repair: Check the exhaust throttle and its wiring.
FMI 12Intake 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.

What FMI means in J1939

SPN 3464 FMI 03464/0 · 3464.0data above normal range (most severe level)
SPN 3464 FMI 13464/1 · 3464.1data below normal range (most severe level)
SPN 3464 FMI 23464/2 · 3464.2data erratic or intermittent
SPN 3464 FMI 33464/3 · 3464.3voltage above normal or shorted high
SPN 3464 FMI 43464/4 · 3464.4voltage below normal or shorted to ground
SPN 3464 FMI 73464/7 · 3464.7mechanical system not responding
SPN 3464 FMI 123464/12 · 3464.12faulty 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: Enough to reach the yard

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.

What to check on the spot

Inspect the air filter and charge-air hoses: leaks and cracks produce exactly these codes.

Nearby: intake / boost

Makes with this code

MAZYaMZCummins ISBKAMAZ-5490

Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.