Rear ABS Issues

[bodgie]

Originally Posted by Classic Boy

I would be surprised if the CRD WJ had a unique sensor.

I think you'll find they're all the same as there's nothing special about the part.

[bowlink]

That’s what I thought as well.

Ok so I have two faulty rear sensors that show 0.5km/h wheel speed on WJDiag, one has been replaced but still showing the error, the module looked fine and has been resoldered, connections around handbrake have been checked but handbrake light also stays on.....

Any other suggestions to fix?

I have another passenger’s sensor from the same 4.7 Jeep the replacement driver’s side came from which I will swap out as well, just in case.

[bodgie]

Originally Posted by bowlink

That’s what I thought as well.

Ok so I have two faulty rear sensors that show 0.5km/h wheel speed on WJDiag, one has been replaced but still showing the error, the module looked fine and has been resoldered, connections around handbrake have been checked but handbrake light also stays on.....

Any other suggestions to fix?

I have another passenger’s sensor from the same 4.7 Jeep the replacement driver’s side came from which I will swap out as well, just in case.

Either you've replace with anotehr fault part or there's a wiring problem somewhere. I expect you'll need torun thourough the troubleshooting guide available in the book of words. Do you have a copy of the manual?

Jason

[Hayesio]

I don't have any experience with this Jeep but most of the time when a vehicle has a wheel speed sensor issue it is an indication of a faulty wheel bearing - particularly with hub unit style wheel bearings found on independent suspension vehicles which I assume this is. You're wheel bearings maybe on the way out.

[bowlink]

The plot thickens - I put in the left second hand replacement and the sensor fault gets replaced by a circuit fault and the right fault goes away. So I think the best option is to source proper new sensors for both right and left rear wheels.

I don't have this fabled book of words yet bodgie! And interesting theory with the wheel bearing Hayesio, definitely something I will look into

[bowlink]

So it turns out my ABS fault (wheel speed sensor) was causing my TCM ("implausible speed") and ECM fault (P0702).

I replaced both rear ABS sensors with new parts from RockAuto part numbers LR: 56041509AA, RR: 56041308AA.

The new sensors made the ABS error which had the trickle down effect of clearing the TCM and ECM fault, so now the car is no longer going into limp mode and is changing and driving smoothly.

More detail in this thread, as I thought the TCM fault was separate to the ABS fault: http://www.ausjeepoffroad.com/forum/...d.php?t=158327