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Autel AutoLink AL539B OBDII Code Reader & Electrical Test Tool

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AutoLink AL539 OBDII & Electrical Test Tool supports all 10 modes of OBD II test for a complete diagnosis. Featuring the unique patented One-Click I/M Readiness Key, circuit test, starting and charging systems test, TFT color display, and built-in speaker, the versatile, easy-to-use AL539 will streamline automotive service and help ensure rapid, accurate diagnosis and timely repair.

Why buy  Autel  AutoLink  AL539B
1. Multilingual Menu and DTC Definitions-English, German, French, Polish, Spanish
2. Works on ALL 1996 and newer vehicles(OBDII & CAN)-domestic and import
3. Update online

4.Warranty for 1 Year (more details please check the link)


Autel AutoLink AL539B  Functions:

1. Works on ALL 1996 and newer vehicles(OBDII & CAN)-domestic and import

2. Capable of diagnosing 12V charging systems, starting systems and condition of discharged battery

3. Easy-to-read AVOmeter allows you to test voltage, continuity and current at the fingertip

4. Features the unique patented One-Click I/M Readiness Key for quick State Emissions readiness check and drive cycle verification

5. Provides quick and accurate load-free testing of most types of 12V batteries, including AGM, standard and maintenance-fee batteries

6. Bright color coded LEDs and built-in speaker provide both visual and audible tone for readiness verification

7. Easily determines the cause of the Check Engine Light (MIL)

8. Retrieves generic (P0, P2, P3, and U0), manufacturer specific (P1, P3, and U1) codes and pending codes

9. Turns off Check Engine Light (MIL), clears codes and resets monitors

10. Displays monitor and I/M readiness status (emissions)

11. Reads live PCM data stream, live O2 sensor test data, freeze frame data

12. Graphs data (1996 and newer)

13. Troubleshooter codes tips guide technicians to the root cause of trouble code faster, saving diagnosis and repair time

14. Memory/battery backup for off-vehicle data review and analysis

16. Retrieves vehicle information (VIN, CIN and CVN)

17. Prints data via PC


Autel AutoLink AL539B Specification:


Display: TFT color display (320 x 240 dpi)

Operating Temperature: 0 to 60°C (32 to 140 F°)

Storage Temperature: -20 to 70°C (-4 to 158 F°)


Autel AutoLink AL539B Information Excepts:


1.On-Board Diagnostics (OBD) II

The first generation of On-Board Diagnostics (called OBD I) was developed by the California Air Resources Board (ARB) and implemented in 1988 to monitor some of the emission control components on vehicles. As technology evolved and the desire to improve the On-Board Diagnostic system increased, a new generation of On-Board Diagnostic system was developed. This second generation of On-Board Diagnostic regulations is called "OBD II".

The OBD II system is designed to monitor emission control systems and key engine components by performing either continuous or periodic tests of specific components and vehicle conditions. When a problem is detected, the OBD II system turns on a warning lamp (MIL) on the vehicle instrument panel to alert the driver typically by the phrase of “Check Engine” or “Service Engine Soon”. The system will also store important information about the detected malfunction so that a technician can accurately find and fix the problem. Here below follow three pieces of such valuable information:

1) Whether the Malfunction Indicator Light (MIL) is commanded 'on' or 'off';

2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored;

3) Readiness Monitor status.


2. Diagnostic Trouble Codes (DTCs)

OBD II Diagnostic Trouble Codes are codes that are stored by the on-board computer diagnostic system in response to a problem found in the vehicle. These codes identify a particular problem area and are intended to provide you with a guide as to where a fault might be occurring within a vehicle. OBD II Diagnostic Trouble Codes consists of a five-digit alphanumeric code. The first character, a letter, identifies which control system sets the code. The other four characters, all numbers, provide additional information on where the DTC originated and the operating conditions that caused it to set. Here below is an example to illustrate the structure of the digits:

3. Location of the Data Link Connector (DLC)

The DLC (Data Link Connector or Diagnostic Link Connector) is the standardized 16-cavity connector where diagnostic scan tools interface with the vehicle's on-board computer. The DLC is usually located 12 inches from the center of the instrument panel (dash), under or around the driver’s side for most vehicles. If Data Link Connector is not located under dashboard, a label should be there telling location. For some Asian and European vehicles, the DLC is located behind the ashtray and the ashtray must be removed to access the connector. If the DLC cannot be found, refer to the vehicle’s service manual for the location.

4. OBD II Readiness Monitors

An important part of a vehicle’s OBD II system is the Readiness Monitors, which are indicators used to find out if all of the emissions components have been evaluated by the OBD II system. They are running periodic tests on specific systems and components to ensure that they are performing within allowable limits.

Currently, there are eleven OBD II Readiness Monitors (or I/M Monitors) defined by the U.S. Environmental Protection Agency (EPA). Not all monitors are supported by all vehicles and the exact number of monitors in any vehicle depends on the motor vehicle manufacturer’s emissions control strategy.

Continuous Monitors -- Some of the vehicle components or systems are continuously tested by the vehicle’s OBD II system, while others are tested only under specific vehicle operating conditions. The continuously monitored components listed below are always ready: 


2Fuel System

3Comprehensive Components (CCM)

Once the vehicle is running, the OBD II system is continuously checking the above components, monitoring key engine sensors, watching for engine misfire, and monitoring fuel demands.

Non-Continuous Monitors -- Unlike the continuous monitors, many emissions and engine system components require the vehicle to be operated under specific conditions before the monitor is ready. These

monitors are termed non-continuous monitors. For different ignition type engines, the available monitors are different too.

The following monitors are to be used for spark ignition engines only:

1) EGR System

2) O2 Sensors

3) Catalyst

4) Evaporative System

5) O2 Sensor Heater

6) Secondary Air

7) Heated Catalyst


The following monitors are to be used for compression ignition engines only:

1) EGR System

2) NMHC Catalyst

3) NOx Aftertreatment

4) Boost Pressure System

5) Exhaust Gas Sensor

6) PM Filter


Autel AutoLink AL539B Package List:

1pc x AL539B Main unit

1pc x Probes

1pc x Battery Test Cable

1pc x OBDII Cable

1pc x USB Cable

1pc x User's Manual

1pc x CD

1pc x Carry Case

1pc x 3.7V Li-ion Battery


Autel AutoLink Function Compare:

Autel AutoLink AL539B

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Sales email


Skype: uuc050

Whatsapp: 8613726294442 or 8613922818729


Wholesale Contact Information

Skype: uuc050

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Product Reviews

Name Rating Review
guest (Posted on 2016-05-05)
It does what is says it does
Hakigo (Posted on 2016-05-05)
It is good tool to do Electric testing for starting and charging system and testing electric compounds but as OBD 2 it won't support some Cars and it won't read every thing
Joseph (Posted on 2016-05-05)
I bought this to read air bags codes. This was more less than the next code reader that can read airbag codes. Mathis is easy to use,and is very logical. Walks you through reading and erasing those codes.

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