SPN 631 — Calibration Module

Safe to driveDrivable, but watch it yourself

J1939 code SPN 631. Below — how the fault is worded at the factory by Renault Trucks, and what the second half of the code (FMI) means in the standard.

Renault Trucks

FMI 5	EECU control unit serial parameterisation not carried out. Repair: Program the EECU.
FMI 11	EECU internal fault. Repair: Replace the EECU control unit.
FMI 13	EECU internal fault. Repair: Replace the EECU control unit.
FMI 14	EEPROM check failed. Repair: Replace the EECU.

What FMI means in J1939

SPN 631 FMI 5631/5 · 631.5	current below normal or open circuit
SPN 631 FMI 11631/11 · 631.11	root cause not known
SPN 631 FMI 13631/13 · 631.13	calibration out of range
SPN 631 FMI 14631/14 · 631.14	manufacturer-specific instructions

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 614System Diagnostic Code #4
• SPN 623Red Stop Lamp
• SPN 624Yellow Warning Lamp
• SPN 626Engine Start Enable Device 1
• SPN 630Calibration Memory
• SPN 636Crankshaft position sensor
• SPN 641Turbocharger Variable Geometry Actuator #1
• SPN 645Engine Tachometer Output Signal
• SPN 685Differential Lock Disable Request, Front Axle 1
• SPN 687Differential Lock Disable Request, Rear Axle 1

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