ABS not functioning?

[nushydude]

Hi,

I've noticed that on rainy days if I press the brakes a bit harder, the wheels would lock which causes the car to drag forward along the road. 

Yesterday I checked this in dry conditions and while I was only doing 40kmph, I still feel the wheels would lock. 

I never saw an ABS warning light come on. 

How should I proceed to resolve this? BTW, I have a 2007 Aurion ATX.

Edit:

Today I received a Check Engine warning and my OBDII sensor gave the P0500 error code. According to this, it could cause ABS to not function. https://www.obd-codes.com/p0500 Maybe this is the reason? 

Cheers

 

Edited September 10, 2017 by nushydude

[campbeam]

This URL may be of assistance. Diagram in the later post has a diagram showing the locations of the speed sensors on the transmission. 

I would be inclined to remove the sensors and clean contacts etc.

How many kms on the odometer and has the transmission been serviced with a fluid change? 

 

[campbeam]

https://www.justanswer.com/toyota/5jjgh-2007-toyota-camry-le-speed-sensor-cyl-test.html

 

[nushydude]

The car has done about 105000km.

Transmission should have been checked at the 90000km service. But I don't know for sure if they replaced the fluid. 

Edited September 10, 2017 by nushydude

[campbeam]

My 2006 Aurion AT-X with about 166,000kms on the odometer was an opportunity eBay purchase. Afterwards, I did the research about the engine and transmission. I dropped the transmission pan and replaced the transmission filter and fluid [as high priority preventative maintenance task]. As forewarned, there was a fair amount of "sludge" coating the bottom of the transmission pan.

This is why I would be inclined to check the speed sensors and clean off any accumulated coating as a starting point.