3.0 crankshaft sensor

[basspastor]

What and how does it work and how do you check it and with what......?????????????

[EuropeanAM]

Please identify your 3.0L engine a little more specifically (preferably including the engine serial number).

In general, the crankshaft position sensor is a sensor that sends signals to the PCM or ECU, notifying the PCM or ECM of the crankshaft's exact position.

[lpugh]

The primary purpose is to tell PCM when the motor is at top dead center for timing and rpm calculations. There are several ways to test it.

!. With a DSO (digital storage oscilloscope) the best way
Minimum of 8 volts peak to peak ac signal for inductive type sensors (two wire)
Three wire type (hall effect) will have square wave with a peak voltage depending
on design. Most common being 5, 8 or 12 volts, in that order.

2. Digital voltmeter. Minimum 4 volts when cranking for all two wire inductive type.
Hall switch type (three wire) turn the motor over slowly by hand and the meter
should switch form 0 to the designed voltage shown above.

3. Ohmmeter. 500 to 1500 ohms. You really need manufactures specs. to be accurate this way. Many manufactures do not provide a ohm. spec. but if it falls with in this range it is probably good. This is really not a good test but will get the job done most of the time.

As far as I know all the earlier 3.0 motors are a 2 wire inductive type sensor. I don't know if any outboard manufacture has gone to 3 wire hall type yet.

How about it Don, have they?

[basspastor]

Thanks to both of you; this will help me in my diagnostic test.

[EuropeanAM]

Leon.... I'm not aware of any three wire crank (VR) sensors.

The resistance on later 3L (555 based) crank sensors should be "Greater than 200 ohms".