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21
Chapter 4 Diagnostics Operations
By establishing a data link to the electronic control systems of the vehicle being serviced
through the VCI device, the Diagnostics application allows you to retrieve diagnostic
information, view live data parameters, and perform active tests. The Diagnostics
application can access the electronic control module (ECM) for various vehicle control
systems, such as engine, transmission, antilock brake system (ABS), airbag system
(SRS) and more.
4.1 Establishing Vehicle Communication
The Diagnostics operations require connecting the MaxiCOM
MK908/MaxiCOM MK908 PRO 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 MaxiCOM 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 MaxiCOM 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 MaxiCOM MK908/MaxiCOM MK908 PRO diagnostic platform
is ready to start vehicle diagnosis.
4.1.1 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.
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