P0720 2005 Dodge Ram 2500 5.9

I could use some help identifying a output speed sensor on a 2005 dodge ram 2500 4wd diesel. It is located between the automatic transmission and transfer case and is a two wire sensor. What is the best way to tell the difference between a two wire hall effect and a variable reluctance sensor. Is there a good video that has covered testing a two wire hall effect. Thanks for any and all help.

Alldata was little help
The component test meter of the Verus describes this as a two wire magnetic pickup sensor.
So you're just going to be looking for an A/C sine wave, like a wheel speed sensor.

It also says that the sensor is not used for vehicle speed, only for governor pressure calculation.

This video shows how to test a two wire VRS type sensor.

DirtyHarry wrote: What is the best way to tell the difference between a two wire hall effect and a variable reluctance sensor.

Good question! I don't know if Paul has covered this in any videos, someone correct me if I'm wrong.

On every 'digital' speed sensor (AKA magneto resistive) I've ever seen, the sensor always has one 'power' feed going into it, 9V or higher. No variable reluctance sensor I know of uses a bias voltage that high (usually 5V or less), so I'll use the initial voltage readings as a guide to what kind of sensor I'm looking at.

Tyler wrote:

DirtyHarry wrote: What is the best way to tell the difference between a two wire hall effect and a variable reluctance sensor.

Good question! I don't know if Paul has covered this in any videos, someone correct me if I'm wrong.

On every 'digital' speed sensor (AKA magneto resistive) I've ever seen, the sensor always has one 'power' feed going into it, 9V or higher. No variable reluctance sensor I know of uses a bias voltage that high (usually 5V or less), so I'll use the initial voltage readings as a guide to what kind of sensor I'm looking at.

Spot on sir!

Noah wrote: Spot on sir!

Crap, does Paul say that in the video? :blush: