Hilux wheel speed sensor abs light

[Debz]

Hi All

I have a 2005 hilux 4x4 kun26r. We upgraded the rear diff to the newer hilux models. All working good except it is throwing the ABS light on the dash and the error that comes up on the scanner is rear right and left wheel speed sensors. It's all plugged. Tried changing the plugs and wires around but nothing works. The speed sensors are from the 2005 model so we haven't changed them to the newer model ones as we didn't think we needed  to. Any help would be great. Thanks

[Hiro]

Is the new diff a different ratio to the old one?  Not sure if the Hilux runs a VSS off the transmission as well as the ABS wheel sensors (on a lot of cars with ABS they use the wheel sensors for VSS instead) but if the diff ratio has changed then the ECU might be seeing a constant discrepancy between expected and actual speeds, thus the error

 

Also, did you just change the diff itself or the whole rear axle?  Maybe something has happened with the tone rings (the toothed wheels that the ABS sensors use to measure speed)