1. Introduction
The KONNWEI KW340 is a professional Car CAN OBD2 Diagnostic Tool designed to help users quickly, effectively, and accurately diagnose car faults. It supports full OBDII modes, including reading and erasing fault codes, I/M readiness status, O2 sensor tests, EVAP system tests, live data stream, and battery voltage checks. This manual provides detailed instructions for setting up, operating, and maintaining your KW340 device.
2. Package Contents
Upon opening the package, please verify that all items listed below are present and in good condition:
- 1 x KONNWEI KW340 Diagnostic Tool
- 1 x 16 PIN OBD2 Cable
- 1 x Type-C USB Cable
- 1 x User Manual
- 1 x Colorful Box (packaging)
3. Product Overview
The KW340 diagnostic tool features a robust design with an anti-slip and wear-resistant casing, equipped with flexible buttons for easy operation. It includes a 2.8-inch TFT color screen for clear display of diagnostic information.
- Green LED: Indicates correct engine operation with no diagnostic trouble codes.
- Yellow LED: Indicates a possible problem; some diagnostics may not have been performed or a DTC is pending.
- Red LED: Indicates an engine problem, potentially with the Malfunction Indicator Light (MIL) on.
- One-click DTC button: Quickly accesses Diagnostic Trouble Codes.
- One-click I/M readiness button: Checks emission system readiness.
- One-click VIN button: Retrieves Vehicle Identification Number.
- ESC button: Exits current menu or function.
- UP button: Navigates upwards through menus or increases values.
- OK button: Confirms selection or enters a menu.
- DOWN button: Navigates downwards through menus or decreases values.
- One-click battery check button: Initiates battery voltage test.
- OBDII connector: Connects to the vehicle's OBD2 port.
4. Setup and Initial Use
Follow these steps to set up and begin using your KW340 diagnostic tool:
- Locate the OBD2 Port: The OBD2 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 KW340: Plug the 16-pin OBD2 connector from the KW340 into your vehicle's OBD2 port. Ensure a secure connection.
- Power On: The device will automatically power on once connected to the vehicle's OBD2 port. No separate power button is needed.
- Initial Language Setting: If prompted, select your preferred language from the available options (English, German, French, Russian, Spanish, Polish, Italian, Portuguese, Dutch).
5. Operating Instructions
The KW340 offers various diagnostic functions accessible through its intuitive menu system and one-click buttons.
5.1. Key Functions
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**Read Codes:** Retrieves Diagnostic Trouble Codes (DTCs) from the vehicle's computer. These codes indicate specific issues detected by the vehicle's self-diagnostic system.
Figure 5.2: DTC Lookup screen showing a P010 code. -
**Erase Codes:** Clears DTCs from the vehicle's computer. This also turns off the Malfunction Indicator Light (MIL) or "Check Engine" light. Ensure the underlying issue is resolved before erasing codes.
Figure 5.3: "Check Engine" light status before and after erasing codes. -
**I/M Readiness:** Checks the status of the vehicle's emission-related monitoring systems. This is crucial for emissions testing. A green checkmark indicates the monitor has run and completed, while a red 'X' indicates it has not.
Figure 5.4: I/M Readiness status display. - **Data Stream:** Displays real-time data from the vehicle's sensors, such as engine RPM, vehicle speed, O2 sensor readings, and more. This helps in diagnosing intermittent problems.
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**Battery Voltage Test:** Allows you to check the car battery's voltage. Connect the scanner to your car's diagnostic port and navigate to the battery or electrical system section. The scanner will display the battery's voltage, typically showing whether it's within a healthy range (around 12.6V when the car is off).
Figure 5.5: Battery Check function. -
**Vehicle Information (VIN):** Retrieves the Vehicle Identification Number (VIN), Calibration ID (CALID), and Calibration Verification Number (CVN) of the vehicle. After powering on, there is no need to click the button to automatically enter the system.
Figure 5.6: Vehicle Information display. - **O2 Sensor Test:** Retrieves O2 sensor monitor test results for the most recently completed tests from the vehicle's on-board computer.
- **EVAP System Test (Mode $8):** Initiates a test of the Evaporative Emission Control System (EVAP) for leaks.
- **Freeze Frame:** Stores a snapshot of critical sensor values at the moment a DTC was set. This data can help pinpoint the conditions under which the fault occurred.
- **On-Board Monitoring:** Retrieves test results for emission-related powertrain components and systems that are not continuously monitored.
5.2. Navigation and Settings
- Use the UP and DOWN buttons to navigate through menu options.
- Press the OK button to select an option or enter a submenu.
- Press the ESC button to go back to the previous screen or exit a function.
- To change the device language, navigate to the 'Settings' menu and select 'Language'. The KW340 supports 9 languages: English, German, French, Russian, Spanish, Polish, Italian, Portuguese, and Dutch.
Figure 5.7: Language selection menu.
6. Maintenance and Updates
To ensure optimal performance and access to the latest vehicle data and features, it is recommended to regularly update your KW340 device.
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**Software Update:** The KW340 supports lifetime free software updates. Connect the device to a computer using the provided USB cable. Download the update software from the official KONNWEI website. Follow the on-screen instructions of the update tool to install the latest firmware.
Figure 6.1: Device update and print functionality. - **Printing Data:** You can print diagnostic data and reports by connecting the KW340 to a computer and using the KONNWEI software. This allows for detailed record-keeping and analysis.
- **Cleaning:** Use a soft, damp cloth to clean the device. Do not use abrasive cleaners or solvents. Keep the OBD2 connector free from dirt and debris.
7. Troubleshooting
If you encounter issues with your KW340, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | Loose OBD2 connection; Vehicle battery low; Faulty OBD2 port. | Ensure the OBD2 cable is securely connected. Check vehicle battery voltage. Test the device on another vehicle if possible. |
| "Link Error" or "No Communication" message | Ignition not on; OBD2 protocol not supported; Faulty connection; Vehicle ECU issue. | Turn the ignition key to the ON position (engine off). Verify your vehicle is OBD2 compliant. Check cable connection. Consult a mechanic if ECU is suspected. |
| Cannot erase codes | Underlying fault still present; Ignition not on. | Ensure the fault causing the DTCs has been repaired. Turn the ignition key to the ON position. |
| Screen freezes or device is unresponsive | Software glitch; Low power. | Disconnect and reconnect the device. Perform a software update if available. |
8. Specifications
Detailed technical specifications for the KONNWEI KW340:
| Parameter | Value |
|---|---|
| Model | KW340 |
| Item Name | Car OBDII Diagnostic Code Reader |
| Features | Read Codes, Erase Codes, O2 Sensor Test, On-Board Monitoring, I/M Readiness, Evap System, Data Stream, Vehicle Information, Freeze Frame, Battery Voltage Test |
| Voltage | 8V ~ 18V |
| Current (min-max) | 131mA - 171mA |
| Storage Temperature | -20°C to 70°C (-4°F to 158°F) |
| LCD Screen | 2.8” 320x240 pixel TFT Color Screen (day & night mode theme) |
| Dimensions (L x W x H) | 163mm x 85.5mm x 23.5mm |
| Power Source | From vehicle battery |
| One-click Keys | DTC, I/M, VIN, Battery Check |
| Supported Languages | English, German, French, Russian, Spanish, Polish, Italian, Portuguese, Dutch |
| Weight | 0.36kg |
9. User Tips
- Always ensure the vehicle's ignition is in the 'ON' position (engine off) when performing diagnostic tests to avoid communication errors.
- For accurate battery test results, ensure the car is off and has been off for a few minutes before performing the test.
- When clearing fault codes, remember that this only turns off the warning light. The underlying issue must be addressed to prevent the code from reappearing.
- Utilize the 'Data Stream' function to monitor live sensor data, which can be invaluable for diagnosing intermittent problems that don't always trigger a fault code.
- Keep your device's software updated to ensure compatibility with the latest vehicle models and access to new features.
10. Warranty and Support
The KONNWEI KW340 comes with lifetime free software updates and printing capabilities. For technical support, warranty claims, or further inquiries, please refer to the contact information provided in your user manual or visit the official KONNWEI website.
