I want to check (bench test) the wheel speed sensors (ohm test) on a V6 without TCS.

On page 5-97 of the FSM, it shows the different ohm values at different ambient temps. My front sensors are right on the spec at 1100 ohms, but my rear sensor, which should read 2500 ohms, reads exactly like the front sensors.

In theory, the rear sensor tests bad....but exactly the same value as the fronts...? That's just too much of a coincidence.

Can anyone ohm test their rear sensor....it's pretty easy from the engine compartment. Unplug the connector from the ABS and ohm terminals 22+23.

See page 5-123 of the FSM for the diagram and which terminals to probe.

Terminal 22 is described as Rear Wheel Sensor Signal (HI)
Terminal 23 is described as Rear Wheel Sensor Return (LO)

On the actual sensor connector itself-at each wheel (Page 5-125) it describes the two wires as HI & LO.

Any Techs know what they refer to..? wheel speed..? electrical signal..?

In researching my other car manuals, the HI circuit is also described as the "signal" whereas the LO circuit is described as the "return".

This would imply that the Brake Module sends a reference signal (or voltage) to the wheel, and depending on the wheel speed, the signal returning is variably diminished by the resistance in the sensor. Can anyone confirm this..?

Last Question--in the ABS system, what would be a likely cause for "ABS Inop" to set ONLY when speeds are above 50 mph after exactly 1 mile. I can drive all day below 50 and not have it set.

Ign Off, then ON resets the warning until the next mile at 50mph. It does not set a code (and I have used 2 diff brands of code readers....just don't have a Tech-2).

 

On the last question, that's probably just the parameter at which the sensor/whatever goes off has to read.