Vehicle network engineering & diagnostics

The fault is on the bus, not in the manual.

EVdiag works on the vehicles the standard tester struggles with — electric and hybrid drivetrains, zonal architectures and software-defined platforms, where a symptom has to be traced across CAN FD, SENT and automotive Ethernet before anyone touches a spanner.

Get in touch See the work

Capabilities

What I do

Diagnostics, network analysis and the small pieces of software that make both repeatable.

Diagnostics on current vehicles

Fault-finding on modern platforms where the answer is rarely a single trouble code — reading live data across the busses, tracing a symptom to the ECU or the wiring that actually causes it, and saying plainly which it is.

Vehicle networks

CAN and CAN FD, LIN, SENT sensor links and automotive Ethernet. Bus loading, timing, termination and physical-layer faults, measured rather than guessed.

Zonal and software-defined vehicles

Architectures where function has moved off dedicated ECUs into central compute and zone controllers, and where a fault can be configuration rather than hardware.

Electric and hybrid systems

High-voltage architecture, battery and charging behaviour, and the diagnostic differences that come with a drivetrain that has no gearbox to blame.

Tooling built for the job

When the existing tool does not exist or is a spreadsheet, I build one. Small, focused software that a technician can use on the shop floor without training.

Documentation and training

Turning a factory document and a tester screen into a procedure someone else can follow, and a report a customer can understand.

Technology

The busses underneath

A modern vehicle is a network before it is a machine. These are the layers a fault actually lives on.

CANLINSENT10BASE-T1S100/1000BASE-T1UDS & DoIPZonal architectureSoftware-defined vehicles

Technology	Standard	Where it matters
CAN / CAN FD	ISO 11898	Classic CAN alongside flexible-data-rate, with the longer payloads and faster data phase that modern platforms rely on.
LIN	ISO 17987	Low-cost single-wire sub-busses for doors, mirrors, seats and comfort actuators.
SENT	SAE J2716	Single-edge nibble transmission — the one-way digital sensor links that replaced analogue signalling on pressure, position and temperature sensors.
10BASE-T1S	IEEE 802.3cg	Multidrop automotive Ethernet on a single pair, sharing one segment between several nodes — the edge of a zonal network.
100/1000BASE-T1	IEEE 802.3bw / bp	Single-pair Ethernet backbones carrying the traffic that used to be split across a dozen busses.
UDS & DoIP	ISO 14229 / 13400	Unified diagnostic services, over CAN and increasingly over IP — the protocol layer beneath every tester screen.
Zonal architecture	—	Zone controllers replacing domain ECUs, with function centralised and the wiring harness shortened.
Software-defined vehicles	—	Behaviour that changes with a software release rather than a part number, and the diagnostic questions that follow from it.

Projects

Tools I have built

Each one started as a job that was slower or more error-prone than it needed to be.

Free · Android & iOS

Clutch Wear

Turns the raw clutch figures on a diagnostic tester into a one-page report the customer understands. Six single-clutch automated-manual gearboxes, every wear limit taken from the factory documentation, VIN read from the windscreen plate with the camera. Works entirely offline — nothing is uploaded anywhere.

Open the app site Read the manual

Web app · 28 languages

NVH Source Locator

Finds where a noise or vibration is actually coming from. Three accelerometers, time-difference-of-arrival between them, and the event located rather than guessed at — with the documentation translated into 28 languages.

Open nvh.evdiag.net

iOS & Android

Stub

A receipt scanner and mileage tracker for self-employed people filing Schedule C. Photograph a receipt and the vendor, amount, date and line items are extracted and mapped to the right tax line; drives are logged automatically. Receipt images and location stay on the device.

Open stub.evdiag.net

About

EVdiag — Roman Franta

EVdiag is my independent practice: diagnostics and vehicle-network engineering on current and near-future platforms, plus the tooling that comes out of doing that work day to day.

Most of what I build starts as a problem on a workshop floor. The Clutch Wear app began as a spreadsheet a technician had to retype for every car; it is now a free app in both stores that prints the customer's copy. That is the pattern — find the step that wastes an hour or invites a mistake, and remove it.

The interest that pulls the rest along is where vehicles are going: electric drivetrains, zonal wiring, and behaviour defined by software releases rather than part numbers. Diagnosing those well means reading the network, not just the fault memory.

Working with me

Enquiries about diagnostics, a bus problem you cannot pin down, tooling, or the Clutch Wear app are all welcome. The quickest route is WhatsApp; email is best if you want to attach logs or a trace.

WhatsApp Email

Contact

Send a message

Email: service@evdiag.net
Phone: +65 8161 7055
WhatsApp: Message on WhatsApp
Clutch Wear support: clutch.evdiag.net/support