OSCILLOSCOPE!

What does an oscilloscope do?

An oscilloscope is easily the most useful instrument available for testing circuits because it allows you to see the signals at different points in the circuit. The best way of investigating an electronic system is to monitor signals at the input and output of each system block, checking that each block is operating as expected and is correctly linked to the next. With a little practice, you will be able to find and correct faults quickly and accurately.


An oscilloscope is an impressive piece of kit:





which way the volts and time go:



-Today in class we use the Oscilloscope to show the reading of the sensor.the sensor showed a positive
reading and there was nothing wrong with it, the reading was about 12.7 mv which is a normal average reading.












- The reading we got to check the TPS looked like this ,

Injectors

In an injector there are solenoid that is controlled by the ECU according to the engine's timing. When the solenoid receives power it opens up to allow the pressured fuel in the fuel rail to squirt into the cylinders. The  coil in the solinoid has resistance that according to ohm's law it means the volts should go down (as shown in the picture below) when the power is removed the voltage goes back up but it is noted that there is a voltage spike, a voltage spike occurs when a magnetic field collapses.

Oxygen sensor

The oxygen sensor voltage oscillates up and down when the car is idling. When the engine speed is increased the voltage will oscillate slower.