Intake protocol

Put the fault in context.

Capture the vehicle, the exact J1939 signal, and what the driver can see or feel. No guesswork required.

New to the flow?

Explore a realistic fuel-pressure case with SPN 157 / FMI 18. The sample stays editable, so you can see exactly what a complete handoff looks like.

What happens next

We save this as a basic diagnostic case only. There is no automatic diagnosis or repair recommendation in this intake.

Step 01 / 05

Identify the vehicle

20%

Vehicle details

Start with the vehicle details a shop will use to identify it.

Vehicle type

Unit number

Required for heavy-duty trucks.

Make

Model

Model year (optional)

VIN (optional)

Engine description (optional)

Odometer (miles) (optional)