Engine and vehicle sensors transmit input signals to the ECM by either: Controlling a reference voltage to produce an analog or digital signal (i.e. ICP, EOT) Generating an analog or digital signal voltage i.e. CMP, VSS Switching an analog 12 volt signal i.e. IVS, DDS Section 6.1.1 Reference Voltage Sensors Reference voltage sensors are supplied… Read More »
The ECM controls the actuators by applying a (low level) signal to the base of the transistor output drivers. These drivers, when switched on, will complete the ground circuit of each actuator. The actuators are controlled through a duty cycle (% time on/off), a controlled pulse width, or simply switched on or off as determined… Read More »
The Electronic Control Module (ECM) monitors and controls engine performance to ensure maximum performance and adherence to emissions standards. The ECM is also able to monitor and control vehicle features such as cruise control, transmission control, starter engagement, etc. See Figure “Electronic Control Module” . To understand how the ECM functions and how it can… Read More »