How to test the cam and the crank sensors on a 1998 subaru forester

Http://www.youtube.com/watch?v=6ws8EVQ6NjE

http://www.youtube.com/watch?v=RtqeOYNgn8A

Check the videos in both the links to know how to test them.

Hi

On modern engines with computer management there are various sensors to tell the computer exactly what the engine requires in the line of fuel, when to spark the coil/s and so on. The engine needs so fire the sparks at the correct time and also inject the fuel at the right time. So a sensor is fitted to pick up exactly at what degree of rotation the crank is. It is sometimes not even mounted near the crank but still called a crank angle sensor, it can even be in the distributor (Nissan and others) This is in the form of a disc with many tiny slots or holes in it and has a light emitting diode and a light sensing diode either side of the disc, as it turns the light is cut off and the computer detects this and can work out the position of the crankshaft. It can also be in the form toothed disc much like a gear on the crank shaft or even use the flywheel to sense the position using a hall effect sensor to detect the position of the flywheel or crankshaft pulley to determine exactly where the crank is positioned.
It is a sensor that tells the ecm where #1 cylinder is. They are located on different parts of the engine on different cars.
It reads the position and/or speed of an engine as it is rotating. When crankshaft is turning, the sensor will provide a signal to the PCM. The PCM will then allow the engine to start by providing spark and fuel.
It reads the rotational position of the crankshaft
Ohmmeters are used to measure the resistance of circuits and the currents that run through them. These devices are used to detect faulty circuits which could cause malfunctioning of equipment hooked up to them. When you are testing a cam sensor, check your car owner's manual for the acceptable resistance measurements for your specific model. Different car models have different acceptable levels for their cam sensor. Make sure the car is turned off before you test the cam sensor to avoid the risk of an electric shock.
Zero the ohmmeter by either pressing the center zeroing button or by touching the red and black probes to each other. The ohmmeter should read 0.Connect the red probe to the positive terminal of the cam sensor, and the black probe to the negative terminal. Both terminals should be marked with a plus sign for the positive terminal and a negative sign for the negative terminal.Observe the reading on the ohmmeter, then detach the probes. Cam sensors with faulty resistance measurements should be replaced


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