Car Diagnostic Test | Auto Electrician | Greater London
We Auto Electrician Hayes Ltd specialise in car diagnosis tests using the OEM diagnostic systems SEA 2534 Interface. Mercedes Star Diagnostic (SD) | BMW ICOM NEXT, ISTA PLUS | VW, Audi, Seat, Skoda, VAGCOM | Toyota/Lexus TECHSTREAM | Honda HDS | Autel MaxiSys 908P | Autel MaxiIM IM608 to be second to none.
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Car Diagnostic Test
To diagnose a car requires automotive technical study, experience in automotive repair and keeping the research and the automotive repair experience up-to-date. Modern cars are full of electronics, but the mechanical system is the same with minor enhancement. The engine components, i.e. ring piston or inlet-outlet manifold, are the same. The air-fuel mixture has no change.
In advanced automotive engineering, the manufacturers are trying to touch the height of efficiency of the vehicles and ease, comfort and driver's safety. If you observe any new car, you will find so many sensors installed to sense the efficiency of the vehicles. These sensors' information goes to the car's brain called ECU (Electronic Control Unit) or (Engine Control Unit). The ECU takes data from the sensors and orders to the car components to maintain the car's set efficiency.
There was a time when car mechanics were diagnosing the car faults listening to the engine sound and vibration now; to diagnose a car's fault, you require a diagnostic machine. In the '90s, OBD arrived for the car testing, and then finally, the manufacturers installed OBDII in the vehicles.
OBDII PIDs data is a calculation of the components fitted in the existing vehicle. It is a technical calculation of automotive engineering to understand OBDII; please read What Is OBDII System?
PIDs data is a live test of a vehicle. To diagnose a car, the technician must know the PIDS calculation to diagnose a vehicle. Most technicians read OBDII fault codes and believe me, these codes only give a technician an idea of nothing more but reading OBDII PIDs. The technician quickly finds the fault because it is the mathematic of automotive engineering.
Testing Car Wires Using Oscilloscope
When you repair a car, visit an auto electrician or call a Mobile Auto Electrician, the most time-consuming and challenging job is to repair wiring using a multimeter or find car electronics' components, testing them and soldering them. Most of the time, we use a microscope.
Understanding wiring is not easy because hundreds of wires in hundreds of different colours are connected to the whole system, from car Sensors to the ECU and ECU's other modules and actuators. AND .... if you think about French Cars wiring diagrams, you will get confused 100%. Most manufacturers use colour codes to understand wiring diagrams, but French Car Manufacturers use numbers only; now, tell me who can memorise hundreds of numerical codes? It is the reason French cars are not popular.
From car door modules to the car exhaust module, all connected through a network called Can-Bus System. If any wire is missing or disconnected in the Can-Bus system, the car starts disturbing the whole system. Eventually, the central controller's Engine Control Module, Body Control Module and Stability Control Unit begin to pass the message to Immobiliser. Immobiliser works like Police, and it can stop the car immediately at the request of the ECU. This challenge only multimeter cannot but oscilloscope only.
Just one rusty connector or any damaged wire in the Can-Bus system can disturb the entire Electronic-Control-System. This fault creates a gap in the communication network that supply information to the ECU and other car modules and the sensors, and this is the fault we call "Limp Mode." "Home Mode." or "Workshop Mode.".
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