How Autel MaxiSys Mini MS905 Establishes Vehicle Communication

The MaxiSys Mini MS905 is a good helper for maintenance in one mobile and smarter wireless tool. MaxiSys Mini MS905 has a 7.9” LED touch screen, powerful A9 quad-core chip, wireless multitasking mobile operating system, combined with the most extensive coverage of OE-level diagnostics. But recently, many buyer came back to insult vehicle communication problems. Here we technicians offers a professional instruction about how Autel MaxiSys Mini MS905 establishes communication with vehicles for those in need.

The Diagnostics operations require connecting the MaxiSys Diagnostic Platform to the test vehicle through the VCI device using the main cable, and test adapters (for non-OBD II vehicles). To establish proper vehicle communication to the MaxiSys display tablet, you need to perform the following steps:
1. Connect the VCI device to the vehicle’s DLC for both communication and power source.
2. Connect the VCI device to the MaxiSys display tablet via BT pairing or USB connection.
3. When these are done, check the VCI navigation button at the bottom bar on the screen, if the button displays a green tick icon at the lower right corner, the MaxiSys Mini diagnostic platform is ready to start vehicle diagnosis.

1.1 Vehicle Connection
The method used to connect the VCI device to a vehicle’s DLC depends on the vehicle’s configuration as follows:
 A vehicle equipped with an On-board Diagnostics Two (OBD II) management system supplies both communication and 12-volt power through a standardized J-1962 DLC.
 A vehicle not equipped with an OBD II management system supplies communication through a DLC connection, and in some cases supplies 12-volt power through the cigarette lighter receptacle or a connection to the vehicle battery.

OBD II Vehicle Connection
This type of connection only requires the main cable without any additional adapter.
 To connect to an OBD II vehicle
1. Connect the main cable’s female adapter to the Vehicle Data Connector on the VCI device, and tighten the captive screws.
2. Connect the cable’s 16-pin male adapter to the vehicle’s DLC, which is generally located under the vehicle dash.
NOTE: The vehicle’s DLC is not always located under the dash; refer to the user manual of the test vehicle for additional connection information.

Non-OBD II Vehicle Connection
This type of connection requires both the main cable and a required OBD I adapter for the specific vehicle being serviced.
 To connect to a Non-OBD II Vehicle
1. Connect the main cable’s female adapter to the Vehicle Data Connector on the VCI device, and tighten the captive screws.
2. Locate the required OBD I adapter and connect its 16-pin jack to the main cable’s male adapter.
3. Connect the attached OBD I adapter to the vehicle’s DLC.

NOTE: Some adapters may have more than one adapter or may have test leads instead of an adapter. Whatever the case, make the proper connection to the vehicle’s DLC as required.
After the VCI device is successfully connected to the vehicle, the Power LED on the device illuminates, and a brief beep sound will be heard.
Some DLC connection only supplies communication and power is to be supplied via the cigarette lighter connection.
 To connect the cigarette lighter
1. Plug the DC power connector of the cigarette lighter into the DC power supply input port on the device.
2. Connect the male connector of the cigarette lighter into the vehicle’s cigarette lighter receptacle.

1.2 VCI Connection
After the VCI device is properly connected to the vehicle, the Power LED on the VCI device illuminates solid green light, and is ready to establish communication with the MaxiSys display tablet.
The Wireless Diagnostic Interface supports 2 communication methods with the MaxiSys display tablet: BT and USB.
Pairing Up via BT
BT pairing is recommended as the first choice for the communication between the MaxiSys display tablet and the VCI device. The working range for BT communication is about 755 feet (230 m); this means you can perform vehicle diagnosis freely around the workshop with greater convenience.
If you use more than one VCI device to connect to the test vehicles when customers are many, you can perform vehicle diagnosis on various vehicles conveniently, by pairing the MaxiSys display tablet separately to each of the VCI devices connected to the different test vehicles, via BT, without the need to repeat the plugging and unplugging procedure, which is unavoidable through traditional wired connection, thus saves you more time and provides more efficiency.
 To pair up the MaxiSys display tablet with the VCI device via BT
1. If not already done, power up the MaxiSys display tablet.
2. Select the VCI Manager application from the MaxiSys Job Menu.
3. When the VCI Manager application is opened, the device automatically starts scanning for available VCI devices around for BT pairing. The found devices are listed in the Setting section on the right side of the screen.
NOTE: If no VCI device is found, this may indicates that the signal strength of the transmitter is too weak to be detected. In this case try to get closer to the device, or reposition the VCI device, and remove all possible objects that causes signal interference. When these are done,
tap the Scan button at the top right corner to start searching again.
4. Depending on the VCI type you use, the device name may display as Maxi suffixed with a serial number. Select the required device for pairing.
5. When paring is successfully done, the connection status displayed to the right of the device name is shown as Paired.
6. Wait for a few seconds, and the VCI button on the system Navigation bar at the bottom of the screen shall display a green tick icon, indicating the display tablet is connected to the VCI device, and is ready to perform vehicle diagnosis.
Refer to 10.1 BT Pairing on page 81 for additional information.

USB Cable Connection
The USB cable connection is a simple and quick way to establish communication between the MaxiSys display tablet and the VCI device. After properly connecting the USB cable from the tablet to the VCI device, the VCI navigation button at the bottom bar of the screen shows a green tick icon in a few seconds, and the USB LED on the VCI device illuminates solid green light, indicating the connection between the devices is successful. The MaxiSys diagnostic platform is now ready to perform vehicle diagnosis.
NOTE: When both the communication methods are applied at the same time, the MaxiSys system will use the USB communication as the default priority.

1.3 No Communication Message
A. If the MaxiSys Display Tablet is not connected to the VCI device, an “Error” message displays. An “Error” message indicates the display tablet is not communicating with the VCI device, and so cannot gain access to the vehicle control module. In this case, you need to do the following check-ups:
 Check if the VCI device is powered on.
 In case of wireless connection, check if the network is configured correctly, or if the right device has been paired.
 If during the diagnosis process, the communication is suddenly
interrupted due to the loss of signal, check if there is any object that causes signal interruption.
 Check if the VCI device is properly positioned. It is recommended to put the VCI device with the front side up.
 Try standing closer to the VCI device to obtain more stable signals, and faster communication speed.

 In case of wired connection, check the cable connection between the display tablet and the VCI device.
 Check if the green LED on the VCI device is illuminated for BT or USB.
 Check if the Error LED on the VCI device is on, this may indicate there is a communication error between the devices, in this case try re-establishing the connection again; if this does not work, there may be a hardware problem with the device, in this case contact for technical support.

B. If the VCI device is unable to establish a communication link, a prompt message displays with check instructions. The following conditions are the possible causes for this massage to display:
 The VCI device is unable to establish a communication link with the vehicle.
 You’ve selected a system for testing that the vehicle is not equipped with.
 There is a loose connection.
 There is a blown vehicle fuse.
 There is a wiring fault on the vehicle, or the data cable or adapter.
 There is a circuit fault in the data cable or adapter.
 Incorrect vehicle identification was entered.

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