SPN 974 — Remote Accelerator Pedal Position

Safe to driveDrivable, but watch it yourself

J1939 code SPN 974. Below — how the fault is worded at the factory by DAF, Dongfeng, MAZ, Mercedes-Benz and YaMZ, and what the second half of the code (FMI) means in the standard.

DAFDongfengMAZMercedes-BenzYaMZ

DAF

FMI 3	Remote throttle control C911 short to power supply at pin B21/B26/B32
FMI 4	Remote throttle control C911 short to ground at pin B21/B26/B32
FMI 19	Remote throttle control C911 CAN communication error

Dongfeng

FMI 3	Short circuit to power supply of the remote accelerator pedal signal
FMI 4	Short circuit to ground of the remote accelerator pedal signal
FMI 19	Timeout of a message from the remote accelerator pedal

MAZ

FMI 2	Manual damper fault - Implausible signal. Blink code: 2-1-8. Power will be reduced. Repair: Check the flap wiring.
FMI 3	Manual damper fault - Voltage above allowed. Blink code: 2-1-8. Power will be reduced. Repair: Check the flap wiring.
FMI 4	Manual damper fault - Voltage below allowed. Blink code: 2-1-8. Power will be reduced. Repair: Check the flap wiring.

Mercedes-Benz

FMI 3	Remote Accelerator Pedal Circuit shorted to Ubat
FMI 4	Remote Accelerator Pedal Circuit shorted to GND

YaMZ

FMI 2	Manual throttle fault (Implausible signal). Blink code: 2-1-8. Power will be reduced. Repair: Check the flap wiring.
FMI 3	Manual throttle fault (Voltage above allowable limit). Blink code: 2-1-8. Power will be reduced. Repair: Check the flap wiring.
FMI 4	Manual throttle fault (Voltage below allowable limit). Blink code: 2-1-8. Power will be reduced. Repair: Check the flap wiring.

What FMI means in J1939

SPN 974 FMI 2974/2 · 974.2	data erratic or intermittent
SPN 974 FMI 3974/3 · 974.3	voltage above normal or shorted high
SPN 974 FMI 4974/4 · 974.4	voltage below normal or shorted to ground
SPN 974 FMI 19974/19 · 974.19	error in received network data

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

• SPN 925Auxiliary Output #2
• SPN 926Auxiliary Output #3
• SPN 928Axle Location
• SPN 970Engine Auxiliary Shutdown Switch
• SPN 972Accelerator Pedal Lockout (Limit Switch)
• SPN 979Remote PTO Preset Speed Control Switch
• SPN 980PTO Enable Switch
• SPN 1041Start Signal Indicator
• SPN 1042Tractor/Trailer Electronic Interface
• SPN 1044Hydraulic Pump-Motor

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