Hey all,

I've had a 2000 coupe for 5 months now and love it. A week ago while driving very slowly over a slightly bumpy dirt/sand road, the next time I started my car I got the ABS active msg, and the brake pedal had the pulsing noisy thing going on till somewhere about 10-15 mph then ABS active goes out, brakes work fine but the "service ABS and service TC" come on w/ associated lites. Ran the DIC and got codes C1227HC as well a couple others unrelated and that I think I've had before...but I'm curious about, they are under RFA and are U1016,U1064,U1096. I have started and driven numerous times (daily driver) since and all 4 of these codes always come up (I clear them every time). Here is maybe a very important point, I also intermittently (maybe only 3 times) get a C1255 code (EBTCM internal malf) so a called the absfixer and he said he's pretty sure it is a bad EBCM and he doesn't repair that year or that problem (only does 01-04.) I also read somewhere in the forums something about a bad microprocessor in the BCM can cause this. Be great if Bill or anyone else could chime in on this.
I have been reading this awesome forum and a huge thanks to Bill Curlee and others for teaching me so much. I've taken apart and super cleaned, stainless steel brush, sandpaper, contact cleaner, ACF50, and dielectric grease all the grnds that I think apply. Front 4 and LR one on frame coming off the WSS harness. The left fwd one was real bad to the point where I couldn't get all the corrosion of the female ends of the connector so cut it off and put a nice eyelet connector on as per some readings on here. LR WSS looks good and ohm ck.s perfect. I tried to ck for less than 100mV (I think that means it is good if I read it right) while spinning the wheel but my multi-meter only reads one decimal point to the right and I get 0.0 hence less than 100mV (I think anyway) so it should be good. Do I read that right? Long story short (OK not really) I think I have a bad EBCM but want to know if I could ck anything else or could it possibly be a bad BCM, but why no other codes other than loss of Comm w/BCM? Does anyone know where I could get a ECBM other than the dealer? Hope that kinda covers it, I'd really appreciate and look fwd to anyones thoughts.

Mike in Hawaii

 

I've had 41 views and no replies, I'm new to posting so pls let me know if I'm doing something wrong that I can fix. I have tried in vain to fix my ABs issue after long (fun though) hours of reading the forums and esp. Bill's excellent posts about electrical problems and grounds. Read and reread it a few times and I'm really at a standstill, think I probably have a bad ECTCM but before I buy one just want to make sure I have covered all the bases. I'd really welcome any input, the info on this site has been absolutely invaluable. Thanks so much to all.

Mike

 

I was waiting to see if Bill C saw this and responded. However, I am not sure what you did when you checked the wheel speed sensor resistance so I would like to make sure you did the correct test. The sensor should test somewhere between 850 and 1350 ohms resistance. It should also test for greater than 100 millivolts when you spin the wheel bearing (you said you were checking for less than 100 mv resistance???). So the 850 to 1350 reading is on the resistance setting of the meter and the 100mv reading is on the millivolt AC voltage setting.

The C1255 could be truly an internal EBCTM failure but it could also be caused by a poor connection between the EBTCM and the BPMV. Remove the EBTCM from the BPMV and check for check for damaged, pushed out, or miswired terminals.

If there is a problem with that connector it could also cause the other issues.

It is hard for people to respond to all of the posts on the forum so you may want to try using Bill Curlee's name in the thread name.

Bill

 

BUMP. Hey Dad its Rich.

 

Hi Bill,

Thanks for the response. The resistance wes good, 1150 ohms. I did pull the connector to the EBTCM and the terminals all looked good from what I could tell anyway. I don't have the manual yet and so I'm working from a portion of the ABS diagnostic sys ck that I found and printed on this forum for my code 1227. I guess where i"m confused(and probably wrong) is I read if it is greater than 100mV the answer is YES and go to Step 5 which is ck for poor connection at the harness connector of the WSS. I have less than 100mV so I think it's good there. Pls tell me if I'm off base and if so does that mean a bad hub, because the resistance was good I'm kinda leaning agaist that. I'm no expert though and value everyones opinion. I PMed Bill C too.
Mike

 

Any help is appreciated. Has no one else had this same issue?

 

C1227 is the LEFT REAR WSS. Have you examined the female pin tension???? Thats the secret to proper WSS electrical operation. The female connections are crap and often fail. You will need a male pin to test the female pin. I busted up and old switch and got the pin out of it and use it as a test pin:



You need to insert the male pin into the female pin and the female pin should have a positive grip on the male pin. I use to recommend just cutting off the old female plug and replacing it but I have found out that you can use a jewelers screwdriver to bend the contact tang back down and fix the female pin.

Heres a good pin female pin and some bad ones:



The one on the left is new,

BC

 

Hey Bill,

I read this thread of yours before and actually did look and initial thoughts were it was OK but I'll take another look, not sure when I'll get a chance right now though. Is it suppossed to be greater than or less than 100mV though? Definetely would rather find a male pin to ck and hopefully the female side is bad. Thanks

Mike

 

When you spin the wheel, you WILL get greater than 100mv. I was seeing 2-3 VDC when I spun it real fast.

Take a reading AT the main EBTCM connector for resistance on each wheel and have someone shock each WSS connector/s with the handle of a screwdriver and watch for a dip in resistance toward INFINITY or higher resistance. If you see a dip, the connector pins are bad.

 

Awesome thanks, I live in a highrise apt and they don't allow any work on cars (UGH) so when it is slow at work next or a day off. Thanks I keep you posted.

 

was the EBTCM, found one FS on this forum...thanks rkort and all others esp. Bill