The Engine Management system in your car is processed through the ECU/ECM (Engine Control Unit/Module) This is the brain of the car so to speak. Through this the process of reading the information sent to it via the sensors around the vehicle is calculated. Sensors are items like Lambda, Fuel pressure, Temperature, The information is interpreted from the data that the vehicle is programmed with and then sends out to actuators to adjust the engine accordingly.
These messages are areas like air-fuel mixture, ignition timing, idle speed, which the actuators control via mechanical & pneumatic and even electrical means. On-Board Diagnostics (OBD) is a motoring term that refers to a vehicle’s self-diagnostic and reporting capability. OBD systems give the vehicle owner or repair technician access to the status of various vehicle sub-systems. The amount of diagnostic information available via OBD has varied widely since it’s introduction in the early 1980’s. Early versions of OBD would simply illuminate a malfunction indicator light if a problem was detected but would not provide any information as to the nature of the problem. Modern OBD implementations use a standardized digital communications port to provide real-time data in addition to a standardized series of diagnostic trouble codes or DTC’s, which allow one to identify and remedy malfunctions within a motor vehicle.
Although most vehicle diagnostics are not as simple as just plug in and see what the fault code is and replace that part. Fault codes are an indication of what the ECU has recorded as information that is different or out of tolerance from its preset manufacturing data. So further diagnostics is needed, various tools help us to do this, some of the equipment we use are: Multi-meter, Oscilloscope, Gas analyser, Fuel pressure gauge, Vacuum gauge, as well as the experience of our technicians. At Auto-Mech we have diagnostic equipment to run checks on your vehicle.