Carworx Limited - Electronic Repairs
How it Works: The Computer Inside Your Car A maze of wires and computers is the key to your vehicle's deepest secrets. The Controller Area Network, or CAN, is incredibly complex, but here's what drivers should know about how it keep your car's components connected.
The shrinking of the car's wiring harness and other benefits were not the main impetus for the creation of CAN. As pollution requirements matured in the late 1970s, the National Highway Traffic Safety Administration and the California Air Resources Board demanded ways to monitor the effectiveness of vehicle-emissions-control systems. The result of that directive was the standardized On-Board Diagnostics protocol (now in its second generation, known as OBD-II) that required a CAN network to efficiently connect to all the engine sensors for a self-diagnosis.
This standard was applied worldwide in the 1980's where every manufacturer had to have an on board system. With this interconnection, a designated ECU can watch the network for problem reports broadcast to the network as OBD-II codes. If an ECU detects a problem, it broadcasts it as an alphanumeric code and the Check Engine light is turned on.
Modern cars carry out these self-checks any time the car is running. A specialised device/reader which is a handheld code reader can plug into the standard 16-pin data port in the driver footwell and retrieve fault codes.This will usually explain the fault or at least give a hint at the problem.
That same data port also comes in handy if a manufacturer uncovers a computer glitch or wants to modify how the car operates. For example, a carmaker may develop an algorithm for smoother transmission shifts. Installing it in any customer car is as simple as a dealer technician plugging his computer into the data port and uploading the new software. Before CAN, this would've meant physically replacing an ECU.
There are several different ECU's in your vehicle m the main ones being the ECM/PCM for the engine and body and the other being the TCM ECU for the gear box and trasmission.
We now cover a wide variety of cars models and have several devices as well as laptops and integrated units to read, diagnose and correct your electronic errors.Every vehicle that comes to us goes through a mandatory electronic diagnosis to make sure we have achieved 100% of the service. Different countries use different standards and all of those are usually combined in these specialised devices.