VDIAGTOOL VD31 OBD2 Scanner User Manual

1. Introduction

The VDIAGTOOL VD31 is a versatile 2-in-1 OBD2 scanner tool designed for comprehensive car diagnostics and automotive key battery testing. This compact and powerful device is easy to use, making it suitable for car owners, DIY enthusiasts, and professional mechanics alike. It helps identify and clear engine fault codes, monitor vehicle performance data, and ensure your car is ready for emissions testing.

Key Features:

• Turn off Check Engine Light (CEL)
• Test key fob battery level
• Read real-time car battery voltage
• Read & clear trouble codes (DTCs)
• Live data stream with 4-in-1 graphing
• Freeze frame data for analysis
• One-click I/M readiness check (emissions readiness)
• Mode $06 onboard monitor test
• Component test function
• O2 sensor test
• Vehicle info reading (e.g., VIN)
• Built-in 100,000+ DTC Lookup
• Data playback & print support
• Support for 8 languages: English, Chinese, French, Spanish, German, Russian, Italian, Polish

2. Setup and Compatibility

The VD31 OBD2 Scanner is designed for extensive compatibility with a wide range of vehicles. Ensure your vehicle is equipped with a 16-pin OBD2/EOBD/CAN port.

Supported Protocols:

• KWP200
• ISO2000
• ISO9141
• J1850VPW

Vehicle Compatibility by Region:

• American (USA) Cars: 1996-present (e.g., Chrysler, Ford, GM, Jeep)
• European Cars: 2003-present (e.g., Alfa Romeo, SAAB, Acura, Opel, Audi, Seat, Peugeot, Bentley, Skoda, Daewoo, Benz, Daihatsu, Land Rover, BMW, Vauxhall, Citroen, Volvo, Fiat, Volkswagen, Ford, Jaguar)
• Japanese Cars: 2008-present (e.g., KIA, Isuzu, Honda, Mitsubishi, Hyundai, Dacia, Lexus, Mazda, Nissan, Subaru, Suzuki, Toyota)
• Chinese Cars: 2010-present (e.g., BYD, Chery, Geely, Great Wall, Karry)

3. Operating Instructions

3.1 Device Layout

1. 2.8 Inch LCD Screen
2. Up Button
3. Shutdown Button
4. Right Button
5. Key Battery Button
6. Down Button
7. I/M Button
8. Left Button
9. ESC Button
10. LED For Different DTC Types
11. OK Button

3.2 Key Battery Test

To test your remote key battery:

1. Ensure the battery is properly installed in the VD31.
2. Select the "Key Battery Check" interface on the device.
3. Press the buttons on the key fob according to the prompts displayed on the screen.

3.3 Car Battery Voltage Test

The VD31 can read the real-time voltage of your car's battery, helping you determine its health and overall condition. This function is typically accessible from the main menu under "Battery" or a similar option.

3.4 Read and Clear Engine Fault Codes (DTCs)

The device allows you to read and clear Diagnostic Trouble Codes (DTCs) that trigger the Check Engine Light (CEL). It includes a built-in library of over 100,000 DTCs with instant explanations to help you understand and address car issues efficiently.

3.5 I/M Readiness (Smog Check)

The I/M Readiness function checks if your vehicle's emissions-related systems are ready for Vehicle Inspection and Maintenance (VIM) testing. This one-click feature helps you determine if your car will pass a smog test and verifies if repairs have been performed correctly.

3.6 Live Data Stream

Monitor real-time data from various vehicle sensors. The VD31 can display up to four PIDs (Parameter IDs) simultaneously and merge them into a single graph for easy comparison and analysis. Monitored parameters include:

• Engine RPM
• Intake air temperature
• Short/Long term fuel trims
• Misfire data
• Throttle position
• Engine coolant temperature
• Oxygen sensor voltages
• Mass air flow
• And more.

3.7 Advanced OBD2 Functions

In addition to the core functions, the VD31 supports several other OBD2 modes:

• View Freeze Frame: Records specific vehicle conditions at the moment an emission-related fault occurs, providing a snapshot for diagnosis.
• O2 Sensor Test: Monitors and tests the operation of oxygen sensors to identify issues affecting fuel efficiency and emissions.
• On-Board Monitor Test (Mode $06): Retrieves test results for emission-related powertrain components and systems that are not continuously monitored.
• EVAP System Test: Initiates a leak test for the vehicle’s Evaporative Emission Control System (EVAP).
• Component Test Function: Allows for testing specific components or systems.
• Vehicle Information: Retrieves important vehicle details such as Vehicle Identification Number (VIN), calibration ID, and calibration verification number.

3.8 Data Printing

You can print diagnostic data for record-keeping or further analysis. Follow these steps:

1. Ensure the VD31 device is properly connected to a computer via USB.
2. Power on the device and navigate to the "Print" function from the main menu.
3. On the device's print page, select the required data you wish to print.
4. The device will send the selected data to the computer software for printing.

4. Maintenance

• Keep the device clean and free from dust and moisture. Use a soft, dry cloth for cleaning.
• Avoid dropping the device or subjecting it to strong impacts.
• Store the device in a cool, dry place when not in use.
• Do not attempt to disassemble or repair the device yourself, as this will void the warranty.
• Ensure the OBD2 cable is not bent or damaged during storage or use.

5. Troubleshooting Common Issues

The VDIAGTOOL VD31 is designed to help diagnose and resolve various car-related problems. Here are some common scenarios where the VD31 can assist:

• Engine fails to start: Use the VD31 to check for engine fault codes and car battery voltage.
• Engine light flashing: Read DTCs to identify the cause and clear the light after repairs.
• Car keys cannot be started: Test the key fob battery level using the VD31.
• Car lacks power going uphill: Check live data for engine performance parameters and fault codes.
• Fuel consumption suddenly increased: Analyze live data, O2 sensor test results, and check for relevant DTCs.
• Engine temperature too high: Monitor engine coolant temperature via live data and check for specific fault codes.
• Loud engine noise: While the VD31 cannot directly diagnose mechanical noise, it can help rule out electronic issues by checking for engine-related fault codes.

If you encounter issues not covered here, refer to the "Warranty and Support" section for assistance.

6. Specifications

7. User Tips

• Language Change: To change the device language, send the Serial Number (S/N) located on the back of your device to VDIAGTOOL customer support. They will authorize the language change within 24 hours.
• Compatibility Check: Before purchasing or if unsure about specific vehicle support, it is recommended to consult the VDIAGTOOL official store to confirm compatibility for your car model.
• Authenticity: All products from the VDIAGTOOL Official Store are 100% original and authentic. You can verify authenticity using the S/N.

8. Warranty and Support

The VDIAGTOOL VD31 comes with a 2-year warranty.

VDIAGTOOL provides 24-hour online service and professional lifetime technical support. If you have any questions or require assistance, please contact VDIAGTOOL customer support. For example, if you need to change the device language, provide your device's Serial Number (S/N) to receive authorization.