1. Introduction
The Autel AutoLink AL439 is a versatile diagnostic scan tool designed for automotive professionals and DIY enthusiasts. It provides comprehensive OBD2/EOBD functionality, electrical testing capabilities, and user-friendly features to help diagnose and resolve vehicle issues efficiently. This manual will guide you through the setup, operation, and maintenance of your AL439 device.
Figure 1.1: Autel AutoLink AL439 main unit with display and controls.
2. Setup
Before using your Autel AutoLink AL439, ensure proper setup and initial configuration.
2.1 Connecting to Vehicle
The AL439 is powered directly from your vehicle's OBD2 port. Locate the 16-pin Data Link Connector (DLC) in your vehicle, typically found under the dashboard on the driver's side. Plug the AL439's diagnostic cable securely into the vehicle's DLC.
Video 2.1: General overview of connecting an Autolink scanner to a vehicle's OBD2 port. (Note: This video features a similar Autolink model, AL549, but the connection process is identical.)
Once connected, the device will power on automatically. Ensure the vehicle's ignition is in the "ON" position (engine off) for initial diagnostics, or running for live data.
2.2 Language Settings
The AL439 supports multiple languages. To change the language:
- From the main menu, navigate to "Setup".
- Select "Language".
- Choose your desired language (e.g., English, Spanish, French).
3. Operating Instructions
The Autel AutoLink AL439 provides various diagnostic functions accessible through its intuitive menu system.
3.1 User Interface Overview
The device features a TFT color display and a keypad for navigation. Key buttons include:
- OK/Enter: Confirms a selection or enters a menu.
- ESC: Exits a menu or cancels an operation.
- Up/Down/Left/Right Arrows: Navigates through menu options.
- I/M: One-Click I/M Readiness check.
- Question Mark (?): Provides help or information.
Figure 3.1: Displaying the main menu with various OBD2 functions.
3.2 Reading and Clearing Codes
To read Diagnostic Trouble Codes (DTCs) and clear them:
- From the main menu, select "OBDII/EOBD".
- Choose "Read Codes" to view current, pending, and permanent codes.
- To clear codes, select "Erase Codes" from the "OBDII/EOBD" menu. Confirm the action when prompted.
Video 3.2: Demonstration of reading and erasing codes using a similar Autel MaxiScan device. (Note: This video features a similar Autel MaxiScan MS309 model, but the code reading/erasing process is generally the same.)
3.3 I/M Readiness Check
The One-Click I/M Readiness Key provides quick access to emission readiness status. This feature indicates if the vehicle's emission systems are operating correctly and are ready for an inspection.
- Press the dedicated "I/M" button on the device.
- The display will show the status of various monitors (e.g., MIL, DTC, MIS, FUE, CCM, CAT, HCAT, EVAP, AIR, O2S, HRT, EGR).
- Green checkmarks indicate readiness, while red 'X' marks indicate incomplete or failed tests.
Figure 3.3: I/M Readiness status display with color-coded indicators.
3.4 Live Data Stream and Freeze Frame Data
Monitor real-time engine data and capture a snapshot of vehicle conditions when a fault occurs.
- Select "Live Data" from the "OBDII/EOBD" menu to view real-time PCM data stream.
- Select "View Freeze Frame" to see a snapshot of sensor values at the moment a DTC was set.
Figure 3.4: Example of live data display, showing voltage and resistance readings.
3.5 Electrical Testing Functions
The AL439 includes capabilities for diagnosing 12V charging systems, starting systems, and battery condition.
- Access "Circuit Test" or "Battery Test" options from the main menu or relevant sub-menus.
- Follow on-screen instructions to perform tests for starting systems, charging systems, and battery health.
Figure 3.5: AL439 connected for electrical system diagnostics.
4. Maintenance
Regular maintenance ensures optimal performance and longevity of your AL439 device.
4.1 Software Updates
The Autel AutoLink AL439 is internet updateable. Regularly check for software updates to ensure compatibility with the latest vehicle models and diagnostic protocols.
- Connect the device to a computer via the provided USB cable.
- Visit the official Autel website (www.auteltech.com) to download the latest update software and follow the instructions.
4.2 Cleaning and Storage
Clean the device with a soft, damp cloth. Avoid using abrasive cleaners or solvents. Store the device in its protective case in a dry, cool environment away from direct sunlight and extreme temperatures.
Figure 4.1: AL439 stored in its protective case.
5. Troubleshooting
This section addresses common issues you might encounter while using the AL439.
5.1 Device Not Powering On
- Ensure the diagnostic cable is securely connected to the vehicle's OBD2 port.
- Verify the vehicle's ignition is in the "ON" position.
- Check the vehicle's battery for sufficient charge.
5.2 Communication Error
- Confirm the vehicle is OBD2 compliant (most 1996 and newer vehicles).
- Ensure the diagnostic cable is not damaged.
- Verify the vehicle's ignition is "ON" or the engine is running.
- Try connecting to a different OBD2 compliant vehicle to rule out device malfunction.
5.3 Incorrect Readings or Data
- Ensure the device software is up-to-date.
- Verify the correct vehicle information is being read (AL439 features AutoVIN detection).
- Consult the DTC Lookup feature for detailed descriptions of codes.
Video 5.1: Unboxing and review of a similar Autel MaxiLink ML529, demonstrating basic functions and troubleshooting steps. (Note: This video features a similar Autel MaxiLink ML529 model, but the general troubleshooting principles apply.)
6. Specifications
| Feature | Detail |
|---|---|
| Model | AL439 |
| Brand | Autel |
| Item Weight | 2 pounds |
| Package Dimensions | 10.43 x 7.48 x 3.39 inches |
| Operating System | Android 5.0 (Note: This may refer to internal system architecture, not user-facing OS) |
| UPC | 792499187736 |
| Vehicle Coverage | Most 1996 and newer US, Asian, and European vehicles (OBD II & CAN) |
| Display | TFT color display |
7. Warranty & Support
7.1 Limited Warranty
Autel warrants to its customers that this product will be free from defects in material and workmanship for a period of one (1) year from the date of original purchase, subject to certain terms and conditions. Please retain your purchase receipt as proof of purchase.
7.2 Technical Support
For technical assistance, product inquiries, or warranty claims, please contact Autel customer support. You can find contact information and additional resources on the official Autel website:
