VXDIAG VCX NANO PRO: What is a vxdiag gm protocol?


What is an OBD2 protocol?

 vxdiag gm

Do you know what the OBD2 protocol is and what it is for? In the United States, every car has had the vxdiag gm status since 1996. In Europe, the date is 2002, and, following this logic, when do you think cars in Europe adopted this standard?

Where did the vxdiag gm protocol come from?

In 2010, manufacturers operating here in Europe decided to adopt a standardization protocol: the OBD2 protocol.

Before, each professional mechanic had his/her way of accessing the vehicle's information and they charged a lot for the use of scanners that had this capability.

Today, there is still a lot that these scanners are needed for. The problem is that they are very expensive.

But there are also Bluetooth and/or GSM devices. These have access to different types of protocols and that can access all of these.

OBDII - What are the so-called vxdiag gm protocols

OBD2 Input

But why are scanners so expensive?

Simple: vxdiag gm can extract as much information as possible from a given protocol. They are still able to read multiple protocols and make changes to the vehicle via OBD input .

How does the OBD2 protocol work?

First of all, it is necessary to understand that protocols are like different logins and passwords. These are to access the same thing: the vehicle's network.

The OBD2 input has a 16-pin connector (J1962). Each one is responsible for transmitting certain information. Each protocol serves as a sort of dictionary that “translates” what each pin “speaks”.

In the beginning, there were 4 protocol types: SAE J1850 PWM (Ford), VPW (General Motors), ISO 9141-2 (Chrysler, European and Asian cars), (most European cars).

 vxdiag gm

The variations between these protocols range from the pin map (which pin transmits what), to the frequency of network information or connection speed.

Why do we need vxdiag gm in modern cars?

Nowadays, with the increase in the volume of data transmitted by the electronic part of vehicles, a need for a more complete and powerful vxdiag gm has arisen.

It was from there that the ISO 15765 CAN protocol appeared, or OBD2 protocol. This is currently common in all cars sold in the United States since 2008. Moreover, it eliminates the need to read 5 ambiguous protocols.

How do computers talk to cars?

Have you ever taken your car to the mechanic? After a light appeared on the dashboard, he connected a scanner to an entrance that you had never repaired and. After a few minutes, he said the problem was solved?

Or, if the problem wasn't resolved, did he claim that he least knew what was causing that damn little light to go on?

It may look like he's deceiving you, but that's usually not the case. He's just taking advantage of vxdiag gm technology.

Today, cars are practically like computers, controlled by an electronic control center.

This center receives a series of data per second and defines what each item in the car will do. Consequently, how it will control acceleration, cornering stability, electronic traction, etc.

It is this fact that makes it possible for the simple act of plugging in a complete notGuia to extract information about the numerous variables of a car.

The History of On Board Diagnostics (OBD)

OBD came about with the government's interest in controlling pollutant emissions from automobiles, whose production was growing at a rapid pace.

Started in California, USA, in the mid-1950s, the government of the country's most populous state, both in cars and in people, began to raise concerns about air pollution due to motor vehicles running on fossil fuels.

Primarily in the form of research and decrees that established an emission limit, agencies and bodies tried to control such pollution.

However, vxdiag gm had a very ineffective beginning. The automakers did their best to “give a way” to this still-born legislation. Developing something to meet the standards would be very expensive.

Why people require vxdiag gm?

As the decades passed and people's concern about the issue increased. Manufacturers began to adopt technologies. It is to reduce the emission of pollutants. Chrysler and 4 other companies, in 1964 with their new   exhaust control system.


Moreover, these were approved by the Motor Vehicle Pollution Board or Volvo in 1977 with its “Smog Free” three-way catalytic converter.

Eleven years later, in 1988, the Air Resources Board (ARB) or Air Resources Council with the assistance of the Society of Automotive Engineers (SAE), the mother of all standards and studies in the automotive world worldwide, demanded that everyone cars sold in California came with vxdiag gm.

This vehicle's internal system monitored the emission performance and was able to alert owners when there was a problem.

How does vxdiag gm detect emission level?

But this only happened in the emission levels of gases and subsystems that permeate this theme, such as fuel control and others, at the manufacturers' discretion.

It was not extremely efficient, as not all vehicles would have been designed for this purpose.

It was another “forced” measure, making each assembler adopt its standard and its architecture to protect privileged information against possible espionage.

What is the structure of vxdiag gm?

From there, came the vxdiag gm, a trapeze-shaped door with 16 key pins, adopted by some as early as 1994. In 1996 by all manufacturers wished to sell a new car in the United States.

These codes are generated after the electronic control center (Electronic Control Unit – ECU) detects something out of the expected when it runs the diagnosis of the various sensors around the car, similar to what your anti-virus does with your computer.

With the indication of the lights, your mechanic will connect a device that talks to the ECU, via the OBD2 port.

Once the scanner connects to the vehicle with the correct OBD2 protocol, it will be able to see, precisely, what the cause of that error (DTC) was and why it turned on the light.

How to access vehicle data?

Often, the devices common can be a scanner, a bluetooth device connected to an app installed on the cell phone (such as Torque for Android) or even a device with a phone chip installed, capable of sending this data live to a server, which handles this information and makes it available to the user.

Our vxdiag gm uses the so-called Internet of Things (IoT) to trace your vehicle's diagnostics.

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