Introduction
The YM519 Professional OBD2 Scanner is a comprehensive diagnostic tool designed for vehicles supporting OBDII/EOBD protocols. It provides accurate diagnostic data, allowing users to read and clear fault codes, monitor vehicle performance, and test battery health. This manual will guide you through the setup, operation, and maintenance of your YM519 scanner to ensure optimal performance and longevity.

The YM519 is equipped with a 2.8-inch color LCD monitor, a durable TPU protective case, and new silicone buttons for comfortable operation. It supports 13 international languages and offers a new UI interface design for faster data display and response.
Key Features
- Full OBDII/EOBD Functions: Supports all nine standard OBDII/EOBD protocols for comprehensive vehicle diagnostics.
- Engine Fault Code Management: Read and clear car engine fault codes, and view freeze frame data.
- I/M Readiness Status: Check the readiness of emission-related systems.
- Vehicle Information: Access essential vehicle details.
- Real-time Data Stream: Monitor live PCM data and view real-time curves of vehicle data.
- Mode 6 Test: Perform component system tests.
- Oxygen Sensor Test: Evaluate oxygen sensor performance.
- Component Test: Test specific vehicle components.
- DTC Lookup: Built-in library for quick fault code inquiry (35,000+ DTCs).
- Battery Test: Exclusive features for vehicle battery voltage reading, monitoring, and evaluation.
- Multi-language Support: Supports 13 languages including Chinese, English, Korean, Japanese, Russian, Polish, Portuguese, Finnish, Italian, French, Spanish, Dutch, German.
- User-Friendly Design: 2.8-inch color LCD, new UI interaction, TPU protective case, silicone buttons, and three high-brightness indicator lights.
- Wide Vehicle Coverage: Compatible with over 100,000 car models from 1996 (US), 2000 (Europe), and 2005 (Asia) and newer.

Specifications
| Attribute | Value |
|---|---|
| Display | 2.8-inch, 320 x 240 Pixel color display |
| Working Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -20°C to 70°C (-4°F to 158°F) |
| Power | 5.0V to 20.0V provided via vehicle battery |
| Dimensions (L*W*H) | 146 mm (5.7") x 86 mm (3.3") x 27 mm (1.06") |
| Net Weight | 228g (0.5 lb) |
| Item Type | Code Readers & Scan Tools |
| Software Update | Yes |
| Language Support | Dutch, English, Finnish, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Spanish |
| Origin | Mainland China |
| OEM NO. | Universal |
| Product Name | Automotive Diagnostic Tool |
| High-concerned chemical | None |


Setup and Connection
- 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 YM519 scanner's OBDII connector firmly into the vehicle's OBDII port. The scanner will power on automatically once connected.
- Start the Vehicle: Turn the vehicle's ignition to the "ON" position (engine off) or start the engine, depending on the diagnostic task.
- Language Selection: Upon first use or after a reset, you may need to select your preferred language from the "Setting" menu.

The YM519 features a 2.2ft advanced low-resistance metal cable for stable and accurate data transfer.
Operating Instructions
The YM519 scanner is navigated using the physical buttons on the device. Refer to Figure 6 for button identification.

Diagnostic Functions
From the main menu, select "Diagnosis" to access the diagnostic functions. Use the UP/DOWN arrows to navigate and OK to select.
- Read Codes: Displays Diagnostic Trouble Codes (DTCs) stored in the vehicle's computer.
- Erase Codes: Clears DTCs from the vehicle's computer and turns off the Check Engine Light (MIL). Ensure the issue causing the code is resolved before erasing.
- View Freeze Frame: Shows a snapshot of sensor data when a DTC was set, helping to identify the conditions under which the fault occurred.
- I/M Readiness: Checks if the various emission-related systems are operating correctly and are ready for inspection and maintenance testing.
- Vehicle Information: Retrieves the Vehicle Identification Number (VIN), Calibration ID (CALID), and Calibration Verification Number (CVN).
- Live PCM Data: Displays real-time data from the Powertrain Control Module (PCM), such as engine RPM, vehicle speed, oxygen sensor readings, etc.
- Realtime Curve: Visualizes live data parameters in a graphical format for easier analysis.
- O2 Sensor Test: Monitors and tests the functionality of oxygen sensors.
- On-Board Mon. Test (Mode 6): Accesses the results of on-board diagnostic monitoring tests for specific components/systems that are not continuously monitored.
- Component Test: Allows for testing of specific components or systems.


Battery Test Functions
Select "Battery" from the main menu to perform battery tests. Press the BAT button for quick access.
- Battery Measurement: Reads the current voltage of the vehicle battery.
- Battery Monitoring: Continuously monitors battery voltage over time.
- Battery Life Evaluation: Provides an assessment of the battery's overall health and estimated life.
Friendly reminder: Please turn off the engine before testing the battery life.


DTC Library
Select "DTC Lib" from the main menu to look up Diagnostic Trouble Codes. Enter the code to get a description and potential causes.
Settings
Select "Setting" from the main menu to configure device preferences.
- Language: Change the display language (supports 13 languages).
- Key Beep: Adjust or turn off the key press sound.
- Brightness: Adjust the screen brightness for optimal visibility.

Maintenance and Care
- Cleaning: Use a soft, damp cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: Store the scanner in a dry, cool place away from direct sunlight and extreme temperatures.
- Cable Care: Avoid bending or twisting the OBDII cable excessively to prevent damage.
- Software Updates: The device supports software updates. Check the manufacturer's website periodically for available updates to ensure optimal performance and compatibility with newer vehicles.
The YM519 is equipped with a TPU protective case to guard against external collisions and scratches, enhancing its durability.

Troubleshooting
- Scanner Not Powering On:
- Ensure the OBDII connector is securely plugged into the vehicle's port.
- Verify the vehicle's ignition is in the "ON" position or the engine is running.
- Check the vehicle's fuse for the OBDII port (consult your vehicle's manual).
- "Check Engine Light" Remains On After Clearing Codes:
- The underlying issue causing the fault code has not been resolved. The code will reappear if the fault persists.
- Some codes require multiple drive cycles to clear completely.
- No Communication with Vehicle:
- Confirm the vehicle supports OBDII/EOBD protocols (most vehicles from 1996 onwards in the US, 2000 in Europe, 2005 in Asia).
- Check for damaged OBDII cable or connector pins.
- Ensure the vehicle's battery has sufficient charge.
- Incorrect Readings or Data:
- Ensure the correct vehicle information (if prompted) is entered.
- Verify the scanner's software is up to date.

Note: The YM519 scanner does not support Airbag or ABS codes.
User Tips
- Always ensure the vehicle's ignition is on when performing diagnostics to ensure the scanner can communicate with the ECU.
- For battery life evaluation, turn off the engine to get the most accurate reading.
- If you encounter a persistent fault code, research the specific code online or consult a professional mechanic after using the DTC Lookup feature.
- Keep the electronic manual (accessible via QR code on the device) handy for quick reference.
Warranty and Support
The YM519 Professional OBD2 Scanner comes with a manufacturer's warranty. For detailed warranty information, technical support, or service inquiries, please refer to the contact information provided with your purchase or visit the official product support website.
Regular software updates are available to enhance functionality and compatibility. Please visit the manufacturer's website for the latest updates and instructions.
