OBD II Diagnostics and its Benefits
All vehicle manufacturers have on their products the On Board Diagnostic II (OBD II) installed. It is the standardization of electronically diagnosing any problem that a vehicle would encounter. Vehicles manufactured from 1996 to present have the OBD II. Diagnostic tools are now universal in the sense that they could be connected and used on virtually all brands of vehicles. The vehicles are equipped with a computer called the Engine Control Unit/Module (ECU or ECM). At the engine and other parts of the vehicle, sensors are installed and wired to the ECU. The sensors are constructed and calibrated in each own special way to determine or measure what is needed by the vehicle to operate properly. The ECU is programmed in a way to identify each sensor. The sensors have operating parameters being monitored by the ECU. If a sensor goes beyond those parameters the ECU generates the Diagnostic Trouble Code (DTC) for it and can be read or scanned by an OBD II tool.
To understand how the system works, let's take one example, the Coolant Temperature Sensor. When a cold engine is started, the sensor "tells" the ECU. With this information the ECU works to let the engine operate the electronic fuel injectors at higher volume. An electronic device at the throttle is triggered to act like a choke. The engine now runs at higher Revolutions per Minute (RPM) until it reaches normal operating temperature. The coolant temperature sensor at this point relays to the ECU the engine condition. The ECU then electronically adjusts the devices to operate at normal temperature. The engine now runs at the ideal fuel-to-air mixture ratio with the correct RPM.
The OBD II Diagnostics is actually for efficient engine operation and performance esp. with the help of chilton auto repair manual. The main objective of efficient operation is for emission control. From the air filter down to the exhaust system there are sensors that provide information to the ECU to control emission. The electronic system of a vehicle is very highly technical that only a diagnostic tool can pinpoint the defective part of engine operation. For those who are interested to learn how diagnostics work, there are many references on the internet as well as in Chevrolet Repair Manual. In learning about it, one will have a better idea when a car is in trouble. The OBD II of cars has standard connecting ports and there are many handheld diagnostic tools available in the market that can be used for any make of vehicle. The tools are reasonably priced and affordable. It will be good to have in the car always.
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