Guides
Field notes on bus diagnostics
Short technical articles about doing this work from a phone or tablet.
2026-08-29 · 6 min
Reading J1939 on Android
How SAE J1939 sits on top of CAN, what PGNs and SPNs actually are, and how to get a readable trace from a truck or machine using an Android phone and a USB CAN adapter.
2026-08-29 · 5 min
Choosing a CAN adapter for Android
PCAN-USB, CANable and SLCAN-class adapters compared for Android use: OTG requirements, CAN FD support, listen-only mode and the practical trade-offs.
2026-08-29 · 6 min
What UDS can tell you that OBD-II cannot
OBD-II is a legislated emissions subset. UDS (ISO 14229) is the manufacturer diagnostic protocol underneath it — here is where the two diverge and why it matters in a workshop.