On 1995 and older vehicles(OBD-I) ground the diagnostic terminal on the ALDL and turn theignition on. When the serviceengine or check engine light illuminates, it is because one of thesensors has detected a 'fault' (an abnormal condition) and so theECM triggers a 'trouble code' which causes the light to illuminate.Generally, the ECM then ignores the input from the affected sensoruntil the reading becomes normal again, and the light will go off.The first step in clearing the trouble code is to retrieve the codeand find out which sensor has a problem. The computeruses the sensors input to make calculations and then sends signalsto the actuators to control their operation. The Computer(ECM) relies on sensors (O2 sensors, MAF, ECT) and actuators (EGRvalve, IAC valve, Fuel Injectors) to get the job done. These systems maintain the bestdriveability and performance at the lowest emissions. All vehicles equipped with fuel injection systems havecomputerized engine controls.
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