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Discussion Starter #1 (Edited)
The check engine light illuminates on a Mazda to indicate the powertrain control module has detected a problem in the engine or transmission of the vehicle. The powertrain control module is a computer that manages the vehicles fuel injection, firing and emissions.

The check engine or malfunction indicator light is on the instrument panel of the vehicle. The engine control module stores a code for the malfunction responsible for illuminating the light.Each code has its own list of possible causes.

Some Mazdas, from the late 1990s to the mid 2000s, have a check engine light that illuminates at 80,000 miles without storing a code in the module, says a Wikipedia page on check engine lights. Mazda uses this as a reminder that routine maintenance of the vehicle requires replacement of the oxygen sensors.

The design of the check engine light causes it to illuminate when the ignition switch is in the on position before the car is started. This allows the driver to know that the light is functioning properly. Unless the ECM has sensed a problem, the light turns off once the engine starts.
The function of VCM II VCM2 is automatic vehicle identification, reading and clearing of diagnostic fault codes and guided fault finding. It is a very effective diagnostic tool
 
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