ABS/ASC no illumination whilst driving, but abs activates.

[Kenhayes247]

Hello all,

I have a question - My ABS/ASC light illuminates as it should when the key is turned to ignition 2 and goes off when the car is started etc.

The ABS works fine under heavy braking on slippery surfaces with the light briefly flashing as it should.

At slow speed under 10Mph the ABS is activating when I am slowing down and turning the steering wheel, i can feel it through the brake pedal. No lights on the dash illuminate though. It does not do it at higher speeds.

According to my creator C310 plus during live streaming there are no signals coming from the front 2 sensors, there are the respective faults generated when interrogated (21 and 11 front R and L wheel speed sensor) and also 94 can data fault from DME/DDE.

The sensors are new, and are OEM from ATE. I have also tried Bosch as well, new of course and still no change. I have checked and cleaned all the connections, i will check the resistance of the sensors next but i do not believe all 4 new front sensors are faulty.

The front suspension components have been completely renewed, cleaned, powder coated etc. New wheel bearings, hubs and reluctor rings as well.

The sensor appears to be correctly located however i was wondering whether the powder coating has it a touch to far away from the sensor to get a reading possibly?

The bolt that secures it is clean and secure, just in case thats an earth.

Could it be the reluctor rings although they are new?

I am considering to remove the abs/asc module and check the internal soldered joints ( a common fault I believe) but before i do has anyone had this problem detailed above?

There is lots of information on here and other forums regarding the above but generally the fault is described with abs/asc light on/intermittent etc.

Clearing the code just brings it back.

Thoughts or suggestions anyone

 

[Sajk]

I have a similar problem. Asc+t works perfectly but the light never flashes. It does come on at startup and goes off as it should.

 

[t-tony]

If it was the solder joints in the module I would expect that you would have lights on the dash. I think you're right thinking it's the reluctor ring/pick up where the fault lies.

Tony.

 

[Kenhayes247]

OK, my OEM sensors are working and giving information during data stream. I swapped them with my Delphi and then my Bosch, all are sending data with wheel rotation even at the smallest speed however the fault is still showing on my creator 310+. Even after it's been cleared. Does the ECU ping the sensors when the ignition is turned on?

I have yet to check fuse 49, apparently that is part of the fuse array for abs/asc. Does it actually exist, it's meant to be under the steering wheel presumably behind the cowling.

As I renewed the brake pipes, lines and calipers could the issue lay with the abs pump and air in the system? I would like to think it's just confined to the wheel sensor or ECU but iam no tech expert.

Iam assuming as the reluctor rings and sensors are working the fault is not going to be the rings?

 

[NZ00Z3]

At slow speed under 10Mph the ABS is activating when I am slowing down and turning the steering wheel

Looking at the "turning the steering wheel". Are you sure you have ASC and not DSC? DSC has the added steering wheel sensor.

 

[Kenhayes247]

Well, the ABS module states its ASC as does the button in the car so I presume ASC. I thought the ABS might be activating whilst braking and turning at slow speed due to the difference in wheel speed and the ECU not being happy with it. At slow speed whilst turning and the brakes not being applied the ABS does not engage.