ECU Error Scan Lite
Lightweight OBD-II DTC scanning with Bluetooth Classic and BLE ELM327 adapters.
Lite edition status: ECU Error Scan Lite is currently under development. The final Lite feature set may be reduced before public release. This page describes the current shared diagnostic foundation and will be updated before publication.
OBD-II DIAGNOSTICS FOR REAL VEHICLE WORK
ECU Error Scan Lite reads standard OBD-II diagnostic trouble codes through a compatible ELM327-type adapter. It supports both paired Bluetooth Classic SPP adapters and Bluetooth Low Energy (BLE) adapters supported by the current transport layer.
ECU Error Scan Lite reads standard OBD-II diagnostic trouble codes through a compatible ELM327-type adapter. It supports both paired Bluetooth Classic SPP adapters and Bluetooth Low Energy (BLE) adapters supported by the current transport layer.
CORE DIAGNOSTIC FUNCTIONS
Confirmed DTCs — Mode 03
Reads confirmed emission-related diagnostic trouble codes reported by the ECU.
Reads confirmed emission-related diagnostic trouble codes reported by the ECU.
Pending DTCs — Mode 07
Reads pending DTCs that have not necessarily matured into a confirmed fault.
Reads pending DTCs that have not necessarily matured into a confirmed fault.
Permanent DTCs — Mode 0A
Reads Permanent DTC information when the vehicle supports this mode.
Reads Permanent DTC information when the vehicle supports this mode.
VIN & protocol awareness
Can read the vehicle VIN where supported and records the detected OBD-II protocol with saved diagnostic sessions.
Can read the vehicle VIN where supported and records the detected OBD-II protocol with saved diagnostic sessions.
General & manufacturer-specific DTC descriptions
Standard descriptions are shown for general codes. When the manufacturer can be determined, supported manufacturer-specific descriptions can also be presented.
Standard descriptions are shown for general codes. When the manufacturer can be determined, supported manufacturer-specific descriptions can also be presented.
DTC clearing with verification
On explicit user request the app can send OBD-II Mode 04, verify the ECU response and rescan the supported DTC modes afterwards.
On explicit user request the app can send OBD-II Mode 04, verify the ECU response and rescan the supported DTC modes afterwards.
Shared diagnostic core
The Lite build uses the same OBD-II transport and parser foundation as ECU Error Scan.
The Lite build uses the same OBD-II transport and parser foundation as ECU Error Scan.
Final limits to be announced
Vehicle-history, comparison, export, backup and profile limits will be defined before the Lite edition is published.
Vehicle-history, comparison, export, backup and profile limits will be defined before the Lite edition is published.
BLUETOOTH CLASSIC & BLE
- Bluetooth Classic: paired ELM327-compatible SPP adapters are supported through RFCOMM.
- Bluetooth Low Energy (BLE): supported UART-style BLE adapters can be discovered and connected on supported Android versions.
- Android 8–11: the current app works with paired devices.
- Android 12+: the app can also discover nearby BLE adapters using the Android Nearby devices permission model.
- BLE support depends on the adapter exposing a compatible UART service. Not every product marketed as “ELM327 Bluetooth” is technically identical.
VEHICLE & DTC SCOPE
- Designed for standard global OBD-II / SAE J1979 emission diagnostics.
- Supports common OBD-II protocol families including CAN and legacy K-Line vehicles when supported by the adapter and ECU.
- Manufacturer-specific DTC descriptions are an additional presentation layer; availability varies by manufacturer and code.
- Not an OEM module scanner: this app is not intended to replace manufacturer diagnostic tools for ABS, SRS/airbag, BCM and other proprietary modules.
OFFLINE-FIRST DESIGN
Core vehicle diagnostics are performed locally between your Android device, the ELM327 adapter and the vehicle ECU. The app does not require an internet connection for normal OBD-II communication. If you explicitly choose an external web search, the query is handed to the browser or another app selected by you.
IMPORTANT DIAGNOSTIC NOTICE
- A DTC identifies a diagnostic condition; it does not by itself prove which component must be replaced.
- Clearing DTCs is not a repair. OBD-II Mode 04 may also reset readiness information and other emission-monitoring state.
- Use DTC clearing only when you understand the diagnostic consequences.
- Permanent DTCs may remain after clearing until the vehicle's own validation conditions are satisfied.
LANGUAGES
The application is being developed with English and Latvian user interfaces. Technical DTC descriptions may remain in English to preserve established diagnostic terminology.
PRIVACY & SUPPORT
Vehicle profiles and diagnostic history are processed locally. Read the full Privacy Policy for details about local storage, Android backup and user-initiated sharing/search actions.
Contact Support:
📧 catalystfixpro@gmail.com
