Autel scanners are powerful diagnostic tools for car maintenance and repair, offering a range of features from basic code reading to advanced system diagnostics. Understanding how to use an Autel scanner can empower car owners and mechanics to identify and troubleshoot vehicle issues effectively. This guide provides a step-by-step walkthrough on using an Autel scanner, covering everything from connecting the device to interpreting diagnostic trouble codes (DTCs).
Locating the OBD2 Port
Most vehicles manufactured after 1996 are equipped with an OBD2 port, a 16-pin connector typically located under the driver’s side dashboard, near the steering column. Consult your vehicle’s owner’s manual if you have difficulty finding it.
Connecting the Autel Scanner
With the ignition off, connect the Autel scanner to the OBD2 port using the provided cable. For Bluetooth-enabled scanners, pair the device with your scanner. Refer to your scanner’s manual to determine whether the ignition should be in the ON or accessory position before proceeding. A successful connection will be indicated on the scanner’s screen.
Entering Vehicle Information
Some Autel scanners require specific vehicle information, such as the Vehicle Identification Number (VIN), before accessing diagnostic functions. The VIN is usually found on a sticker on the driver’s side dashboard, near the windshield. You might also find it under the hood or on the driver’s side doorjamb. Your scanner may also prompt for the vehicle’s make, model, and engine type.
Accessing OBD2 Codes
Navigate to the scanner’s menu and select the system you wish to diagnose (e.g., engine, transmission, ABS). The scanner will then display active and pending DTCs. Active codes indicate current issues triggering the check engine light, while pending codes suggest potential problems that haven’t yet fully developed.
Interpreting OBD2 Codes
DTCs consist of a letter and four digits:
- Letter: Indicates the system related to the code (P: Powertrain, B: Body, C: Chassis, U: Undefined).
- First Digit: Indicates whether the code is generic (0) or manufacturer-specific (1).
- Second Digit: Specifies a particular vehicle component.
- Last Two Digits: Pinpoint the specific problem.
Record the displayed codes before proceeding to the next step.
Diagnosing Trouble Codes
An Autel scanner identifies the problem codes, but further diagnosis may be needed to determine the root cause and appropriate solution. Consult repair manuals, online resources, or a qualified mechanic to understand the specific code and recommended repair procedures.
Resetting the Check Engine Light
After resolving the issue, the check engine light may turn off automatically after a certain driving cycle. However, you can use the Autel scanner to reset the light immediately. Locate the “Erase Codes” or similar function in the scanner’s menu and follow the prompts. Keep in mind that resetting the light without fixing the underlying problem will only temporarily suppress the warning.
Advanced Autel Scanner Features
Many Autel scanners offer advanced functionalities beyond basic code reading, including:
- Live data streaming: Real-time monitoring of sensor values.
- Freeze frame data: Capturing vehicle data at the moment a fault code was triggered.
- Component testing: Activating specific components for diagnostic purposes.
- Special functions: Oil resets, EPB service, SAS calibration, BMS resets, ABS bleeding, DPF regeneration.
By understanding how to use an Autel scanner and interpret its results, you can gain valuable insights into your vehicle’s health and address potential issues proactively. Remember to consult your scanner’s specific user manual for detailed instructions and safety precautions.
