abs and asc not working

[Dre0415]

Hello everyone, I just bought my 2nd 97 z3 and I just finished replacing a head gasket on it engine runs great. But now I'm trying to get my abs and asc working. I'm thinking some sort of wiring problem. My autel code scanner cannot communicate with the module. The abs and traction control lights did not turn on when I got the car. But slamming the brakes would quickly tell you it wasn't working. I pulled the cluster to find the traction control bulb missing. And now I'm able to get the abs light to come on but not the traction control light. My autel still cannot communicate with the abs module even through 18 pin connector. It can find all other modules file though. What are your guys suggestions on where to start

 

[colb]

Your scanner will not communicate the ABS through the 16pin OBD2 socket in the car it should when plugged into the 20pin Round Pac-man socket in the engine bay using a 20pin to 16pin cable changer to plug your scanner into it.
If you get no communication then I would suggest the Module is dead, maybe down to bad solder joints on the internal board.
Only way to confirm that would be to cut the plastic cover off the pump to inspect the circuit board and resolder the connections. Threads on here as to how to do this if you have a search. There are firms out there that recondition these units if you prefer going that route.

 

[Dre0415]

So after reading through some other forums turns out you need a very specific connector to communicate with ABS module on this car. I used the 20 pin PAC man connector with no connection tried it on a same model year car and still couldnt connect. Its apparently a very common problem on these cars. I used a Autel Scanner and BMW INPA with 0 luck on either. From what ive read on other fourms you need a ADC connector and you cannot use a USB it must be a old style serial connect r232 interface. Both of my scan tools were able to read all of the other modules except for ABS. With my previous testing I can confirm the module in the car isnt bad as same issue occured on 2 cars of same model year.

 

[colb]

I think @Dre0415 is correct since the car is a 1997 model it will need to be read using an r232 connected interface, early cars were not quite OBD2 and required this different connection to run INPA.

 

[Dre0415]

I really didn't want to fire the parts cannon on this car but I think that's my only options as clearly the scan tool would probably cost more then all the parts combined to fix it. I'm gonna buy 4 wheel speed sensors and pray it fixes it.

 

[Trevor /chedder]

 

[Trevor /chedder]

Mine wouldn't connect either, found a chap who advised this, cut back the ring on the adapter, connected fine after.

 

[Dre0415]

Mine wouldn't connect either, found a chap who advised this, cut back the ring on the adapter, connected fine after.

Just tried this with my autel still no connection what tool did you end up using to connect?

 

[t-tony]

Another thing you can try if the port hasn't had much use is to spray it with electrical contact cleaner spray. it's worked for me several times.

Tony.

 

[Oddly Godly]

It's not unheard of for the asc to be deleted. If so the separate throttle body that joins to the main throttle body is removed. I can't see the point. If it is done properly a resistor is used to fool the car in to thinking the asc is still present. Its possible someone done this but not used the resistor. Probably unlikely but worth a look. I am not sure what models this applies to.

 

[Ianmc]

My April 1997 build M44 does not have ASC from factory, but it does have ABS. Don't know if this was such in the USA though, or if early 2.8s were so specked?

 

[Oddly Godly]

Mine is a 1999 2.8 and has it. If it has the dash light and the button which turns it off it should have it. I suppose it's possible for the cluster to be replaced with a slightly different one. But if it has the button to turn it off manually it should have asc. If no button its possible it was never there to start with

 

[Dre0415]

So I ended up finding a blown fuse that was blown in a way where on the multi meter would test it as good. When I would stick the probes in to the fuse it would push the connection back together so earlier I missed it. After replacing the fuse the abs and asc is now working but my autel and inpa still cannot connect to the module. I tested abs by slamming brakes and its 100 percent working now. So I'm not sure what's up with all the connection problems I'm getting.

 

[Oddly Godly]

To test the asc find a quiet spot and wheel spin away. The asc light on the dashboard should come on momentarily while it cuts the throttle to stop the wheels spinning. Glad you are making progress

 

[Scooblitz]

So I ended up finding a blown fuse that was blown in a way where on the multi meter would test it as good. When I would stick the probes in to the fuse it would push the connection back together so earlier I missed it. After replacing the fuse the abs and asc is now working but my autel and inpa still cannot connect to the module. I tested abs by slamming brakes and its 100 percent working now. So I'm not sure what's up with all the connection problems I'm getting.

I have the exact same issue and I looked at all the fuses and they seemed to be intact. Can you remember which fuse was the culprit?

Mine is also 1997 and I would suggest you are onto something with the r232 connector to read the ABS module. I've read of people needing windows xp and an old laptop to run INPA.