Do Both the Camshaft Pos Sensor and Crankshaft Pos Sensor generate a voltage during cranking?

[Microman]

I have a 95 Ford Contour 4 Cyl, that cranks and no start.

I am concentrating on the Cam and Crankshaft sensors now.

Do both of them generate a voltage when cranking a no starter?

Not getting any Voltage from the Camshaft sensor on cranking, thats the sensor that is on the top of the engine towaards the back on top on drivers side, two wires held on, with wire clip, right?

What I see when hooking up a digital meter is:

Crankshaft Position Sensor

Resistance .40 on 20k scale
.397 on 2K scale

Then turning over .9 volts on 200 volt scale




Camshaft Postion Sensor

.46 resistance on 20k scale?

nothing on AC volts when cranking <-- is this OK?


I also noticed the connection to the Camshaft Sensor was moist/wet, when I disconnected it. Dried it off.

 

[aboythatskates]

Cps does have more resistence too. Go to a part store and ask to test one of their sensors and compair. Or maybe someone on here could do it for ya. But it should create a current though...

 

[2000ZxT]

You may not see AC voltage on the cam sensor. I can't recall exactly how the Zetec pulses work but its typically a single pulse, at 1 pulse for every 2 revolutions of the motor so a meter isn't going to pick up that tiny voltage. You need to scope it to make sure the pulse is there. The crank is 35 of those pulses at twice the speed which is why you are seeing voltage there (the sensors make there own voltage)...~1v should be fine to start on the crank sensor. Did you check for +12 to the coilpack? Check the spark plugs? Its pretty rare VR sensors go bad which is why they are so commonly used, wires are usually the culprit of the issues.

 

[aboythatskates]

you can also ohm the plug wires and coilpack as well.

 

[amc49]

Use an oldschool analog needle type meter, much easier to see the pulse. They both should show a needle blip whenever the bump passes the coil. Use DC, AC will only show if it spins faster, starter doesn't turn it fast enough for AC to accumulate. Lowest volt scale you got.

Simple two wire proximity mag impulse sensor, every time bump crosses coil it will induce a pulse, coil has a magnet in core.