3/10/2024 0 Comments Computer command rideGeneral Motors smart ECMs have memory and learning ability and can remember changes that produce peak performance. This time period is referred to as the pulse length and is measured in milliseconds. The ECM controls the fuel mixture by varying the duration of time that the 8 injector solenoid valves are open. The ECM receives information about the engines operating conditions from various sensors and then calculates the optimum spark timing and fuel mixture according to preprogrammed values. The Body Control Modules are not covered in this book, and should not be confused with Throttle Body Fuel Injection Systems. In later year systems, it is also referred to as the Engine Control Module (ECM) since some vehicles have an additional computer unit known as a Body Control Module (BCM), which is involved in the control of various non-engine or drive train functions. The ECM, commonly referred to as the "brain" of the system is, in fact, a computer and is capable of making over 600,000 commands per second. The data is processed by the ECM and, if necessary, the ECM issues commands to change the operating parameters of the engine to optimise performance and economy at all times. The Computer Command Control (CCC) system comprises the Electronic Control Module (ECM) and information sensors which monitor various engine functions and returns data to the ECM.
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