Description

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The on-board diagnostic system known as “OBD” made its debut in the 2000s, and is now part of most vehicles manufactured since then. This tool allows you to get a more precise reading on diagnostic trouble codes and is connected via a plug known as the “OBD (On-Board Diagnostic) plug”.

 

 

Functional principle

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This system helps detect diagnostic trouble codes thanks to sensors that inform the on-board computer. These diagnostic trouble codes are communicated to the driver of the vehicle via an indicator light on the dashboard called an MIL (Malfunction Indicator Lamp).
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In order to understand these diagnostic trouble codes and translate them into human language, we use a diagnostic kit, an IT tool that stores all the possible diagnostic trouble codes that can come up in a vehicle, based on its features, year of manufacture, motorization and various technologies the vehicle uses.

 

 

Knowing how to decipher a diagnostic trouble code

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The first letter indicates the diagnostic trouble code family:

P: Powertrain group, in other words, the engine and the transmission

C: Chassis

B: Body

U: Network

The first number indicates whether or not the code is generic (green digit):

0: Generic

1: MINI-Specific

The last three numbers correspond to the following:

0, 1 and 2: Fuel and air metering

3 : ignition system

4 : auxiliary emission control

5 : vehicle speed and idle

Source : http://www.outilsobdfacile.fr/