The ABS, VSC & VSC Off warning lights are lit on my Nov. 2002 Lexus SC430 (LD52 OXJ).

Using Techstream GTS Diagnostics > ABS/VSC/TRAC > Data List, I discovered that the Rear Right Wheel Speed was not registering any speed. All 3 other wheels register a speed as I drive, but not the Rear Right. It stays at zero MPH.

However Techstream did not show any DTC error codes?

I assumed that the Rear Right ABS Wheel Speed Sensor was faulty so replaced it with Lexus part no: 8954524030. I reconnected Techstream which cleared the ABS, VSC & VSC Off warning lights. However, as soon as I drove a short way these lights returned & the Data List showed Rear Right Wheel Speed was still not registering any speed.

The problem is obviously not the RR ABS sensor. (Both the old & new sensor show ~ 1,069 ohms).

How may I diagnose deeper what the real problem is?

 

 

I must get a better AC voltmeter. Mine only goes down to 200 V.

Reluctor ring secure, but I did indeed have many iron filings on the sensor when I removed it, and the sensor did seem quite a distance from the reluctor ring, tho' it's castellations still looked quite prominent.

I've heard that corrosion on the inside of the hub can be a problem. There is a sleeve inside which gets pushed out due to rust which then wears away the reluctor ring.

It looks a massive job to replace the reluctor ring, so before I resort to that, and as I seem to have two good sensors, I thought I'd try filing down the shoulder of one ABS sensor so it gets closer to the reluctor ring! What do you think? I'll also check for rust & release the hub sleeve if it's grinding the reluctor ring.... as I can without removing the hub assembly.

I'm away on hols now, but will let you know how it goes mid June. Thanks again Coleroad.

 

Had time to take another peek down the ABS sensor aperture. I must have been dreaming thinking I saw castellations last time I looked. As you see, the reluctor ring has been worn smooth!! That's my problem. Thanks again Coleroad.


I'm now on the hunt for a new reluctor ring.

 

 

I'll find out when I replace ring (mid June), but likely corrosion on the inside of the hub where there is a sleeve inside which gets pushed out due to rust which then wears away the abs ring.

This link was helpful.