Introduction
The KONNWEI KW310 is a professional automotive code reader designed for diagnosing vehicle issues. This plug-and-play device allows users to quickly read and clear engine fault codes, view live data, and perform various diagnostic tests on OBDII/EOBD compliant vehicles. Its user-friendly interface makes it accessible for both professional mechanics and car owners.

Key Features
- Full OBDII/EOBD Diagnostic Functions:
- Read Codes: Retrieve Diagnostic Trouble Codes (DTCs).
- Erase Codes: Clear DTCs and reset monitors.
- Live Data: View real-time operational parameters of the vehicle.
- View Freeze Frame: Capture a snapshot of vehicle conditions when an emission-related fault occurs.
- I/M Readiness: Check the status of emission-related monitors.
- O2 Monitor Test: Retrieve O2 sensor monitor test results.
- On-Board Mon. Test: Retrieve results for emission-related diagnostic monitoring tests of specific components/systems.
- Component Test: Allow initiation of a leak test for the vehicle's EVAP system.
- Vehicle Info: Retrieve vehicle identification number (VIN), calibration ID (CALID), and calibration verification number (CVN).
- Modules Present: Identify communication protocols present in the vehicle.
- Unit of Measure: Configure measurement units.
- User-Friendly Design: Plug and play operation, fast scanning, large LCD display, and four logical buttons (ESC, ENTER, Up, Down) for easy navigation.
- Portable and Durable: Anti-slip design with a long diagnostic cable for convenience.
- No Battery Required: Powered directly from the vehicle's OBDII port.
- Multi-Language Support: Supports English, French, German, Dutch, Spanish, Russian, and Portuguese.
- Lifetime Free Software Updates: Ensures compatibility with the latest vehicles and bug fixes.

Specifications
| Attribute | Detail |
|---|---|
| Model | KW310 |
| Color Options | Red, Black |
| Supported Protocols | ISO 9141, KWP2000, SAE J1850, CAN, J1850 VPW, J1850 PWM |
| Supported Languages | English, French, German, Dutch, Spanish, Russian, Portuguese |
| Operating Temperature | 0 to 60°C (32 to 140 F°) |
| Storage Temperature | -20 to 70°C (-4 to 158 F°) |
| Dimensions (L x W x D) | 11.6 cm x 8 cm x 2.4 cm |
| Weight | 170g |
| Connector Type | 16 PIN OBDII |


Setup Guide
- Locate the OBDII Port: The OBDII port is typically located under the dashboard on the driver's side of the vehicle. Refer to your vehicle's owner's manual if you cannot find it.
- Connect the Scanner: Plug the 16-pin OBDII connector of the KW310 into your vehicle's OBDII port. Ensure a secure connection.
- Power On: The KW310 scanner will automatically power on once connected to the vehicle. No external batteries are required.
- Start Vehicle (Optional): For some diagnostic functions, it may be necessary to turn the ignition key to the "ON" position or start the engine. Follow the on-screen prompts or your vehicle's specific requirements.
Operating Instructions
Once the KW310 is connected and powered on, use the navigation buttons to access various diagnostic functions.
- Navigation: Use the UP and DOWN arrow buttons to scroll through menu options.
- Select: Press the ENTER button to confirm a selection or enter a submenu.
- Exit/Back: Press the ESC button to return to the previous menu or exit a function.
Common Diagnostic Procedures:
- Reading Trouble Codes:
- From the main menu, select "Read Codes" and press ENTER.
- The scanner will display any stored Diagnostic Trouble Codes (DTCs) and their descriptions.
- Erasing Trouble Codes:
- After addressing the vehicle's issue, select "Erase Codes" from the main menu and press ENTER.
- Confirm the action when prompted. This will clear the DTCs and turn off the Malfunction Indicator Lamp (MIL).
- Caution: Do not erase codes before diagnosing and fixing the underlying problem, as this may hide critical information.
- Viewing Live Data:
- Select "Live Data" from the main menu and press ENTER.
- You can view various real-time sensor readings and operational parameters. Use the arrow buttons to scroll through data streams.
- I/M Readiness Status:
- Select "I/M Readiness" to check if the vehicle's emission systems are ready for an inspection/maintenance test.
- "OK" or "Complete" indicates the monitor has run and passed. "INC" or "Incomplete" means the monitor has not yet run its full diagnostic cycle.
Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Storage: Store the KW310 in a clean, dry environment within the specified storage temperature range (-20 to 70°C / -4 to 158 F°). Use the included Velcro bundle to keep the cable tidy.
- Software Updates: The KW310 offers lifetime free software updates. Periodically check the KONNWEI official website for available updates to ensure optimal performance and compatibility with new vehicle models. Follow the instructions provided with the update package.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Scanner does not power on. | Loose connection to OBDII port; vehicle's ignition not on (if required). | Ensure the OBDII connector is securely plugged into the vehicle's port. Turn the vehicle's ignition to the "ON" position. |
| "LINKING ERROR" or "COMMUNICATION ERROR" message. | Vehicle not OBDII compliant; faulty connection; vehicle's ECU not responding. | Verify your vehicle is OBDII compliant (most vehicles from 1996 onwards in the US, and newer in other regions). Check the connection. Try on another OBDII compliant vehicle if possible. |
| Cannot clear trouble codes. | Underlying fault still present; ignition not in "ON" position. | Ensure the vehicle's fault has been repaired. Turn the ignition to "ON" (engine off) before attempting to clear codes. |
| Display is frozen or unresponsive. | Temporary software glitch. | Disconnect the scanner from the vehicle, wait a few seconds, and reconnect. If the issue persists, check for software updates. |
User Tips
While no specific user reviews or Q&A were provided, here are some general tips for using your KW310 scanner effectively:
- Always ensure the vehicle's ignition is in the "ON" position (engine off) when reading or clearing codes, unless specifically instructed otherwise by the scanner or your vehicle's manual.
- When viewing live data, focus on parameters that are relevant to the symptoms your vehicle is exhibiting.
- After clearing codes, drive your vehicle for a short period (a "drive cycle") to allow the vehicle's monitors to run and reset. This is especially important before emissions testing.
- Keep the user manual handy for quick reference to functions and troubleshooting.
Warranty and Support
For warranty information, technical support, or assistance with software updates, please contact KONNWEI customer service or visit their official website. Ensure you have your product model (KW310) and any purchase details available when seeking support.





