Observations from the map
The Changan map ranks 30 with 13 definitions; the largest module types are: transmission control unit (3), engine control unit (2), ecu_module (2).
13 of the addresses use 11-bit CAN identifiers and 0 use 29-bit identifiers. 1 definitions have scan priority 1; priority decides which module a scan starts from.
Modules in the map
| Module name | Type | Address | Response | Priority |
|---|---|---|---|---|
| Engine | Engine Control Unit | 7E0 | 7E8 | 1 |
| Rear motor control unit | Engine Control Unit | 7A7 | 7AF | 2 |
| Transmission | Transmission Control Unit | 7E1 | 7E9 | 3 |
| Electronic shift lever | Transmission Control Unit | 7D1 | 7D9 | 4 |
| Transmission electrical oil pump | Transmission Control Unit | 7A5 | 7AD | 5 |
| ABS safety-critical | ABS / ESP Module | 780 | 788 | 6 |
| SRS/AirBag safety-critical | Airbag / SRS Module | 7F1 | 7F9 | 7 |
| BCM | Body Control Module | 700 | 708 | 8 |
| Dashboard/Instruments cluster | Instrument Cluster | 701 | 709 | 9 |
| Electronic power steering | Steering Module | 785 | 78D | 10 |
| Battery Management System | High-Voltage Battery Module | 7A1 | 7A9 | 11 |
| Hybrid control unit | — | 7A0 | 7A8 | 12 |
| SPEU/DPEU | — | 7E7 | 7EF | 13 |
See the modules in your vehicle
With an ELM327-based BLE OBD2 adapter, CarCoding scans the vehicle’s modules, reads fault codes from those it can reach and explains every code in plain language. Which modules are reachable depends on the make and on the vehicle. The app is free to download.
Some advanced features require an in-app purchase.
Data source: the CarCoding ECU scan map (ecuDatabase.ts). The addresses and names in the table are definitions from the map; they can differ depending on the hardware and software version in your vehicle.