Abs code CO205

Good Evening,
I was wondering if anyone could point me in the right direction here. I had this code pop up on my tacoma after my abs started acting funky, and by funky I mean everyone couple stops, the abs on my truck would kick in braking normally and after a little bit this code keeps popping up on my reader. I noticed my brakes got noticeably softer right around the time this happened too (I just replaced 90% of my brakes, new front calipers, pads, rotors, rear shoes, rear hardware, rear drums, but the only thing that I haven't replaced is the rear wheel cylinders but they seem to be in good shape, but I also have a problem with my rear brakes, they keep coming out of adjustment but this time they went soft in a matter of a couple minutes rather than a couple weeks) I bled the brakes after I accomplished all of this too, however I heard you have to bleed the brakes from a location other than the calipers and cylinders? If so advice on the propper bleeding procedure there would be greatly appreciated. Back to the main issue at hand here, attached is the code on my reader. Does anyone have any expireance on whether it would be a sensor or the harness? When I bought the truck in 15', I had to replace the rear harness and sensors and I know how much of a bear that was to do and how expensive it was then, and looking at parts for the front, they are even more expensive!! Any advice on how to test what it is and what to replace would be great! Thank you!

 

What method did you use to bleed your brakes? When you did the brake work, did you cap off the brake lines to minimize fluid loss / prevent air from working it's way up the system?

It sounds like you still have air trapped somewhere. If you left the system open, it could be a real pain in the ass to bleed as air could have worked it's way up to the ABS module. If you kept the system relatively closed, then a good bleeding should fix things. BTW- I HIGHLY suggest getting a motiv power bleeder- my brakes have never felt better.

What type of components did you go with on all this replacement work? OEM, parts store, etc?

As far as that ABS code is concerned. If it's right (there is a special way to read ABS codes for 1st gen tacomas that doesn't involve the ODBII port)- it's telling you there is an issue with the front left hand sensor. So start looking there. Remove the sensor and clean it with electric contact cleaner. While the sensor is out, look through the port and inspect the tone ring for any debris - A bad front wheel bearing could expel grease onto the tone ring.

 

The ABS kicking in during braking is most likely that sensor dropping out at low speeds, that could be caused by:
An air gap issue between the sensor and tone ring (most likely from rust)
A damaged tone ring or sensor.
A failing sensor.
An open or short in the wiring between the sensor and ABS ECU.

If your scanner can read wheel speeds watch them while slowing down, if one slows down quicker or goes to 0 before the others and your ABS kicks in that is the suspect sensor.