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SPN 29 — Accelerator Pedal Position #2

Safe to driveDrivable, but watch it yourself

J1939 code SPN 29. Below — how the fault is worded at the factory by KAMAZ, MAZ, SITRAK, YaMZ and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.

KAMAZMAZSITRAKYaMZZF AS-Tronic

KAMAZ

FMI 2Accelerator pedal position sensor 2
FMI 3Accelerator pedal position sensor 2
FMI 4Accelerator pedal position sensor 2

MAZ

FMI 2Accelerator pedal position sensors fault - Implausible signal. Blink code: 2-2-1. Power will be reduced. Repair: Check the accelerator pedal position sensors and their wiring.
FMI 3Accelerator pedal position sensors fault - Voltage above allowed. Blink code: 2-2-1. Power will be reduced. Repair: Check the accelerator pedal position sensors and their wiring.
FMI 4Accelerator pedal position sensors fault - Voltage below allowed. Blink code: 2-2-1. Power will be reduced. Repair: Check the accelerator pedal position sensors and their wiring.

SITRAK

FMI 3High voltage on accelerator pedal channel 2 signal
FMI 4Low voltage on accelerator pedal channel 2 signal

YaMZ

FMI 2Accelerator pedal position sensor fault (Implausible signal). Blink code: 2-2-1. Power will be reduced. Repair: Check the accelerator pedal position sensors and their wiring.
FMI 3Accelerator pedal position sensor fault (Voltage above allowable limit). Blink code: 2-2-1. Power will be reduced. Repair: Check the accelerator pedal position sensors and their wiring.
FMI 4Accelerator pedal position sensor fault (Voltage below allowable limit). Blink code: 2-2-1. Power will be reduced. Repair: Check the accelerator pedal position sensors and their wiring.

ZF AS-Tronic

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 8No CAN bus signal: "engine requested cooling fan increase".

What FMI means in J1939

SPN 29 FMI 229/2 · 29.2data erratic or intermittent
SPN 29 FMI 329/3 · 29.3voltage above normal or shorted high
SPN 29 FMI 429/4 · 29.4voltage below normal or shorted to ground
SPN 29 FMI 829/8 · 29.8abnormal frequency or pulse width

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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