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SPN 1624 — Tachograph Vehicle Speed

Safe to driveDrivable, but watch it yourself

J1939 code SPN 1624. Below — how the fault is worded at the factory by KAMAZ, MAZ, Mercedes-Benz, Renault Trucks, SITRAK and YaMZ, and what the second half of the code (FMI) means in the standard.

KAMAZMAZMercedes-BenzRenault TrucksSITRAKYaMZ

KAMAZ

FMI 3Vehicle speed measurement, path 2 (via CAN)
FMI 4Vehicle speed measurement, path 2 (via CAN)
FMI 12Vehicle speed measurement, path 2 (via CAN)
FMI 255Vehicle speed measurement, path 2 (via CAN)

MAZ

FMI 2Vehicle speed sensor fault - Signal invalid. Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.
FMI 3Vehicle speed sensor fault - Voltage above allowed. Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.
FMI 4Vehicle speed sensor fault - Voltage below allowed. Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.
FMI 12Vehicle speed sensor fault - CAN bus signal implausible. Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.

Mercedes-Benz

FMI 9J1939 TCO1 Message is missing or not available
FMI 13J1939 Tachograph Vehicle Speed Signal is missing

Renault Trucks

FMI 9CAN bus link to the tachograph. Repair: Check the continuity of the CAN bus wiring connected to the EBS unit (X1/1, X1/3). Check that the tachograph is connected correctly and works.
FMI 18The speed sensor sends data that the VECU processor considers incoherent. Repair: Check the speed sensor connections.

SITRAK

FMI 3Tachograph vehicle speed signal above the upper limit. Scan tool code: P2158. Effect: Torque may be limited.
FMI 4Tachograph vehicle speed signal below the lower limit. Scan tool code: P2160. Effect: Torque may be limited.
FMI 8Tachograph vehicle speed signal error. Scan tool code: P2161. Effect: Torque may be limited.

YaMZ

FMI 2Vehicle speed sensor fault (Signal incorrect). Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.
FMI 3Vehicle speed sensor fault (Voltage above allowable limit). Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.
FMI 4Vehicle speed sensor fault (Voltage below allowable limit). Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.
FMI 12Vehicle speed sensor fault (Signal incorrect). Blink code: 3-2-4. Repair: Check the vehicle speed sensor and its wiring. Check the CAN bus connection.

What FMI means in J1939

SPN 1624 FMI 21624/2 · 1624.2data erratic or intermittent
SPN 1624 FMI 31624/3 · 1624.3voltage above normal or shorted high
SPN 1624 FMI 41624/4 · 1624.4voltage below normal or shorted to ground
SPN 1624 FMI 81624/8 · 1624.8abnormal frequency or pulse width
SPN 1624 FMI 91624/9 · 1624.9abnormal update rate
SPN 1624 FMI 121624/12 · 1624.12faulty device or component
SPN 1624 FMI 131624/13 · 1624.13calibration out of range
SPN 1624 FMI 181624/18 · 1624.18below normal — moderate severity

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: Drivable, but watch it yourself

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.

Nearby: other

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