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FAULT CODE READER

September 11th, 2008 · No Comments

Nearly all engines found in modern vehicles are fitted with a number of sensors and an Electronic Control Unit, which is often referred to as an ECU. The function of the engine sensors is to constantly send information to the electronic control unit (ECU) which monitors the performance of various areas of the engine.

The ECU then analyses the information it has received and determines whether the values are within the manufacturer’s permitted specifications/tolerances, minor changes in value can be compensated for by the ECU. For example it can adjust/ determine the correct injection duration. However, if the ECU receives information from a sensor and the value is outside the manufacturer’s permitted specifications/tolerances then the ECU will recognise this as a fault as it is fitted with a pre-programmed self-diagnosis system.

The ECU will then store the corresponding code in its memory for retrieval at a later date and in some cases will set the corresponding code in its memory for retrieval at a later date and in some cases will set itself to run on a pre-programmed emergency backup value otherwise known as ‘mapping’.This allows the vehicle to be driven to a garage or home etc. for fault diagnosis and repair.

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