KW309 Portable Multiple Languages OBD Diagnostic Tool
User Manual
Model: KW309 | Brand: VIHELM
1. Product Overview
The VIHELM KW309 is a portable On-Board Diagnostics (OBD) diagnostic tool designed to help users identify and troubleshoot issues with their vehicle's engine system. It supports multiple languages and provides essential diagnostic functions for various car models.
What's in the Box:
- KW309 Diagnostic Tool (x1)

2. Key Features
- Multi-Language Support: The KW309 supports various languages, making it accessible to a wider range of users.
- DTC Error Code Display: Directly displays Diagnostic Trouble Codes (DTCs) and their meanings, eliminating the need for online searches.
- Comprehensive OBDII/EOBD Functions: Includes functions such as Check Engine Light status, Read Codes, Erase Codes, I/M Readiness, O2 Sensor Test, Emission Check, Freeze Frame data, and Live Data stream.
- Trouble Code Clearing: Allows for reading and clearing of both generic and manufacturer-specific check engine light codes, and resets monitor status.




3. Setup
To begin using the KW309 diagnostic tool, follow these simple steps:
- Locate your vehicle's 16-pin OBD2 port. This port is typically found under the dashboard on the driver's side.
- Ensure your vehicle's ignition is in the "ON" position (engine can be off or running, depending on the test).
- Plug the KW309's OBD2 connector firmly into the vehicle's OBD2 port. The device will power on automatically.

4. Operating Instructions
The KW309 features intuitive navigation with ESC, ENTER, and arrow keys. Once connected, the main menu will appear.
- Read Codes: Select "Read Codes" from the main menu to retrieve Diagnostic Trouble Codes (DTCs) stored in the vehicle's computer. The tool will display the code and a brief description.
- Erase Codes: After addressing the issue, select "Erase Codes" to clear the DTCs and turn off the Check Engine Light. Confirm the action when prompted.
- I/M Readiness: Check the status of the vehicle's emission-related monitors to determine if they are ready for an emissions test.
- Live Data: View real-time sensor data from the vehicle's engine, such as engine RPM, vehicle speed, oxygen sensor readings, and more.
- Freeze Frame: Access a snapshot of sensor data recorded at the moment a DTC was set, providing valuable information for diagnosis.
- System Information: View vehicle information such as VIN (Vehicle Identification Number), Calibration ID, and Calibration Verification Numbers (CVN).
5. Vehicle Compatibility
The KW309 is designed to be compatible with most OBD2 compliant vehicles. OBD2 protocols became standard for vehicles manufactured in the following regions and years:
European Vehicles
Standard EOBD protocols (after 2003 year)
- For Abarth
- For Alfa Romeo
- For Aston Martin
- For Audi
- For Bentley
- For BMW
- For Bugatti
- For Citroen
- For Dacia
- For Ferrari
- For Fiat
- For EU FORD
- For Jaguar
- For Lamborghini
- For Land Rover
- For Maserati
- For Mini
- For Opel
- For Peugeot
- For Porsche
- For Renault
- For SAAB
- For Seat
- For Skoda
- For Smart
- For VAUXHALL
- For Volvo
- For VW
Asian Vehicles
Standard OBD2 protocols (after 2007 year)
- For Acura
- For Asia GM
- For Daewoo
- For Daihatsu
- For Honda
- For Hyundai
- For Infiniti
- For Isuzu
- For KIA
- For Lexus
- For MAZDA
- For Mitsubishi
- For Nissan
- For Ssangyong
- For Subaru
- For Suzuki
- For Toyota
American & Australian Vehicles
Standard OBD2 protocols (after 1996 year)
- For Chrysler
- For US Ford
- For GM
- For Jeep
- For Scion
- For Chevrolet
- For Cadillac
- For Lincoln
- For Dodge
- For Buick
- For Holden
- For AU FORD
Chinese Vehicles
Standard OBD2 protocols (after 2009 year)
- For BYD
- For Changan
- For Changhe
- For Chery
- For Emgrand
- For Englon
- For Foton
- For Geely
- For Gleagle
- For GWM
- For HBSH
- For Huachen
- For Lifan
- For Wuling
- For Yuan

Important Note: While compatible with most cars, some vehicles may not support the OBD2 protocol at certain times, or specific car designs may limit compatibility. This device primarily offers OBD2 functions and does not include advanced features like ABS Reset or Airbag Reset. For specific compatibility concerns, especially with Japanese and Korean cars, please consult your vehicle's manual or contact the manufacturer.
Specific Compatibility Warnings:
- Not supported: Lada/VAZ/UAZ cars manufactured before 2012.
- Not supported: Ssangyong cars manufactured before 2008.
- Not supported: Renault Dacia Logan models manufactured before 2010.
- Not supported: Electric cars and Hybrid cars.
- Not supported: 24V trucks.
- Not supported: Nissan Leaf and similar models.
- Not supported: Renault/Chevrolet Skoda car models.
- Not supported with specific protocols: Ssangyong Actyon from 2009 to 2017 years; Ssangyong Korando, 2.0 TD Diesel, from 2013 to 2017 years; Ssangyong Kyron, 2.0 Diesel, from 2010 to 2017 years; Ssangyong Rexton, 2011 to 2017 years.
- Not supported: Opel Corsa C 2004 1.3 CDTI.
- Not supported: Citroen C4 2005.
- Not supported: Chevrolet cars.
- Not supported: Renault Logan/Megane.
- Not supported: Skoda Fabia, Skoda Octavia.
6. Troubleshooting Vehicle Issues with KW309
The KW309 is designed to assist in diagnosing common vehicle problems indicated by the Check Engine Light. It helps identify the root cause of issues such as:
- Ignition Difficulties: The tool can read codes related to ignition system malfunctions.
- Fault Light Blinking: A blinking fault light often indicates a severe misfire; the KW309 can help pinpoint the cylinder or component causing it.
- Excessive Exhaust Emissions: By checking O2 sensor data and emission monitor status, the tool can indicate issues contributing to high emissions.
- Large Fuel Consumption: Diagnostic codes related to fuel system, oxygen sensors, or engine performance can be read to identify causes of poor fuel economy.
- Liquid Leakage: While the tool doesn't directly detect leaks, related sensor failures or system malfunctions that might be a symptom of a leak could trigger codes that the KW309 can read.

If the tool itself is not functioning as expected, ensure it is properly connected to the OBD2 port and that your vehicle's ignition is on. If issues persist, refer to the "Warranty and Support" section.
7. Maintenance
To ensure the longevity and optimal performance of your KW309 diagnostic tool, follow these maintenance guidelines:
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the tool in a cool, dry place, away from direct sunlight and extreme temperatures.
- Handling: Avoid dropping the device or subjecting it to strong impacts. Do not pull the cable forcefully when disconnecting from the vehicle.
- Cable Care: Inspect the OBD2 cable regularly for any signs of damage, such as cuts or frayed wires. Replace if necessary.
8. Specifications
| Specification | Detail |
|---|---|
| Model | KW309 |
| Brand | VIHELM |
| ASIN | B0BZCN55WD |
| UPC | 797427713308 |
| Manufacturer | VIHELM |
| Package Dimensions | 3 x 2 x 1 inches; 1 Pounds |
| Date First Available | March 23, 2023 |
9. Warranty and Support
Specific warranty details for the VIHELM KW309 diagnostic tool are typically provided with the product packaging or can be found on the manufacturer's official website. Please retain your proof of purchase for warranty claims.
For technical support, troubleshooting assistance, or inquiries regarding product functionality, please refer to the contact information provided by the seller or manufacturer at the time of purchase. Online resources and FAQs may also be available on the VIHELM website.