๐How does a car diagnostic scanner work?
๐How does a car diagnostic scanner work?
A car diagnosis is carried out by a mechanic to probe your entire car and detect the slightest problem before it turns into a breakdown. Unlike a check-up, the diagnosis is carried out because you have detected an abnormal symptom while using your vehicle.
For example, a check can be done for safety before going on holiday, while a diagnosis will be carried out if you explain to the mechanic that you hear a noise when braking or that a warning light comes on constantly when you brake.
To do this, he will either use an automotive diagnostic tool to analyze the functions of your vehicle or inspect and test the vehicle on his own. Diagnoses can therefore take various forms:
- An electrical and electronic diagnosis: the mechanic will come and check the sensors as well as the entire electrical system linked to your vehicle's battery. Many electronic problems are corrected by updating the vehicle's ECU;
- Diagnosis of mechanical parts not linked to sensors: some information may be missing in connectors. It is therefore necessary to carry out a manual check of the mechanical parts concerned. This diagnosis will take longer and will require very meticulous care;
- A diagnosis with a car diagnostic kit: this allows you to analyse all the vehicle's malfunctions.
The type of diagnosis your mechanic will carry out depends mainly on the signs you have identified while using your vehicle.
๐ก What is the purpose of an electronic car diagnostic case?
A car diagnostic kit takes the form of a box with a black and white or color screen on more recent models and a system of directional keys (up, down, right, left). The latest models also have Bluetooth and/or WiFi functionality.
A car diagnostic kit will query your car's ECU. The ECU is a tool that analyzes and lists all the fault codes related to the vehicle's system. It connects to the ECU using a standardised diagnostic socket called OBD with a connector and 16 pins.
The suitcase reads the memory of the control unit, which reads all the vehicle's operating data: values from the PMH sensor, values from the flow meter, etc. Also known as a fault code reader, the suitcase is equipped with auto software that can be that of a particular car brand or multi-brand.
Garages offering this type of service must have a license to use this approved and certified tool and also have a subscription to car diagnostic software.
Sometimes, even if the measurement taken is correct, the sensor may be defective. However, if it is the ECU that is defective, the mechanic will not be able to carry out a diagnosis. The computer will have to be replaced.
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