Function:
Speed and Position Sensors is one on car that serves to tell the ECM (Engine Control Module) abaut position, speed and change of speed of a component.
Types:
1. Camshaft position sensor (G-sensor), detects the position of the camshaft.
2. The crankshaft position sensor (Ne-sensor), detects the position of the crankshaft.
3. Vehicle Speed Sensor detects the changes vehicle speed.
Camshaft Position Sensor (G-Sensor)
By knowing the position of the camshaft, the ECM can determine when siinder number 1 is on the compression stroke. ECM use this information to determine the time:
• injection of fuel;
• ignition timing; and
• variable valve control system.
This sensor is mounted near one of the camshaft. In the V type engine mounted one sensor for each cylinder. On the machine with distributor ignition system, the sensor mounted inside the distributor.
AC voltage signal that is proportional to the speed of the camshaft. Therefore, the sooner the camshaft rotates the higher frequencies produced.
Variable Valve Position Sensor
In VVT-I system, camshaft sensor is referred to as variable valve position sensor.
Crankshaft Position Sensor (NE Sensor)
ECM use crankshaft signals to know:
• RPM machines;
• The position of the crankshaft; and
• engine misfire (knocking)
This signal (called NE signal ) combined with G signal (indicating the cylinder in the compression stroke), of both this signal, ECM can determine the order of ignition (firing order).
VSS signal comes from a sensor that measures the speed of the transmission / transaxle or the speed of the wheel. Some of the differences from the sensors are used depending on the model of the vehicle.
On some vehicles, VSS signal is processed in the combination meter and then sent to ECM. In some vehicles equipped with the ABS braking system, the signal is processed in the ABS computer system and then ABS computer sends it to the combination meter and to the ECM.
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