1. Introduction
The OnRetul V350 is a professional-grade OBD2 diagnostic tool designed to help you quickly identify and resolve vehicle issues. This device functions as a code reader, engine light tester, and battery voltage checker, providing comprehensive diagnostic capabilities for a wide range of vehicles.
It supports full OBD2 functionality, including reading and clearing Diagnostic Trouble Codes (DTCs), performing I/M readiness checks, analyzing freeze frame data, monitoring live data streams, and testing battery voltage. The V350 is an essential tool for both automotive enthusiasts and professional mechanics seeking efficient and accurate vehicle diagnostics.

2. Key Features
- Full OBD2 Functionality: Read and clear Diagnostic Trouble Codes (DTCs), reset the Check Engine Light (MIL).
- I/M Readiness Detection: Proactively check the emission readiness status of crucial vehicle systems, aiding in smog test preparation.
- Live Data Stream: Monitor real-time data parameters such as fuel pressure, coolant temperature, and engine RPM to accurately locate intermittent faults.
- Freeze Frame Data: Captures and restores exact operating parameters of the vehicle at the moment a fault occurs, assisting in troubleshooting.
- Battery Voltage Test: Check the vehicle's battery voltage.
- Built-in DTC Library: Access a comprehensive library of over 35,901 DTC definitions, eliminating the need for external lookups.
- Universal Compatibility: Works with most OBD2 compliant gasoline vehicles manufactured after 1996 (USA), 2002 (EU), and 2008 (Asia).
- User-Friendly Interface: Simple navigation with dedicated buttons for DTC, I/M, and EXIT.

3. Vehicle Compatibility
The OnRetul V350 OBD2 Diagnostic Tool is designed for universal fit with vehicles that are OBD2 compliant. This includes:
- Gasoline cars produced after 1996 (USA).
- Gasoline cars produced after 2002 (European Union).
- Gasoline cars produced after 2008 (Asia).
The device connects via the standard 16-pin OBD2 port. Please note that this scanner is not compatible with hybrid vehicles, electric vehicles, or non-OBD2 compliant models.
4. Setup Guide
Follow these 8 steps to set up and begin using your V350 scanner:
- Locate the DLC: Find the Diagnostic Link Connector (DLC) on your vehicle. This is typically located under the dashboard on the driver's side.
- Connect the Tool: Plug the OBDII diagnostic tool's cable into the vehicle's DLC.
- Turn on Ignition: Turn the ignition of your car to the "ON" position (do not start the engine).
- Vehicle Identification: Wait for the scanner to automatically detect and identify your vehicle model.
- Read Codes: Navigate the menu to select the "Read Codes" option to retrieve any stored fault codes.
- Interpret Codes: Use the built-in DTC library or external resources to understand the meaning of the retrieved codes.
- Address Issues: Perform necessary repairs or maintenance based on the diagnostic information.
- Clear Codes: After fixing the issues, navigate to the "Erase Codes" option to clear the fault codes from the vehicle's system.
Important: Fault codes should ONLY be erased after the underlying issue has been repaired to prevent recurrence and ensure proper vehicle function.

5. Operating Instructions
5.1. Diagnostic Menu Navigation
Once connected and powered on, the V350 will display the main diagnostic menu. Use the directional buttons (up, down, left, right) and the "OK" button to navigate through the options.

5.2. Reading and Clearing Codes
- Read Codes: Select "Read Codes" from the Diagnostic Menu. The scanner will retrieve and display any active, pending, or historic Diagnostic Trouble Codes (DTCs).
- Erase Codes: After performing necessary repairs, select "Erase Codes" from the Diagnostic Menu. Confirm the action to clear the Check Engine Light and stored DTCs. Ensure repairs are complete before clearing codes.
5.3. I/M Readiness Test
The I/M Readiness function checks the status of the vehicle's emission-related monitoring systems. This is crucial for preparing for emission tests.
- Select "I/M Readiness" from the Diagnostic Menu.
- The tool will display the status of various monitors (e.g., MIL Status, Misfire Monitor, Fuel System Mon, Comp. Component) as "OK" or "INC" (Incomplete).
- A status of "OK" indicates the monitor has completed its diagnostic cycle. "INC" means the monitor has not yet completed.

5.4. Live Data Stream
This feature allows you to view real-time operational data from your vehicle's sensors and systems.
- Select "Live Data" from the Diagnostic Menu.
- The screen will display various parameters such as engine RPM, coolant temperature, fuel system status, and more.
- This data can help diagnose intermittent problems that may not trigger a DTC.
5.5. Built-in DTC Definitions
The V350 includes an extensive library of Diagnostic Trouble Code definitions. When a code is displayed, the tool can provide a direct explanation of what the code means, saving time on external research.
- When a DTC is displayed, the scanner will often provide a brief description.
- For more detailed information, navigate to the DTC lookup function (if available) or select the code to view its full definition.
- The library covers generic (SAE) codes and manufacturer-specific codes related to Powertrain, Network & Vehicle Integration, Body, and Chassis.

6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: Store the V350 in a cool, dry place away from direct sunlight and extreme temperatures.
- Cable Care: Ensure the OBD2 cable is not kinked or damaged. Store it neatly to prevent wear and tear.
- Software Updates: Check the manufacturer's website periodically for any available software updates to ensure optimal performance and compatibility with newer vehicle models.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. |
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| Cannot link to vehicle / Communication error. |
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| Codes cannot be cleared. |
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8. Specifications
| Feature | Detail |
|---|---|
| Model | V350 |
| Brand | OnRetul (XMSJ) |
| Product Dimensions | 3"L x 0.8"W x 5.1"H |
| Operating System | Windows 10 (Internal/Compatibility) |
| Automotive Fit Type | Universal Fit (OBD2 compliant gasoline vehicles) |
| Special Features | Bluetooth |
| High-concerned chemical | None |
| Origin | US |
9. User Tips
No specific user tips were available from provided reviews or Q&A. General advice for OBD2 scanners includes:
- Always ensure the vehicle's ignition is in the "ON" position (engine off) when performing diagnostics, unless specifically instructed otherwise for certain tests.
- For accurate I/M Readiness results, ensure your vehicle has completed a full drive cycle after any repairs or battery disconnections.
- Keep the device's software updated to ensure compatibility with the latest vehicle models and diagnostic protocols.
10. Warranty and Support
For any problems encountered during the use of your OnRetul V350 OBD2 Diagnostic Tool, please contact customer support. The manufacturer commits to responding within 24 hours to assist with your inquiries and issues.
Please refer to your purchase documentation for specific warranty terms and contact information.