kentyboy 0 Posted November 23, 2011 Report Share Posted November 23, 2011 hi...having a few problems and wondering if anybody can help...when starting car up,abs light stays on,if i reverse out of the cul de sac where i live and go up the road the light goes out.now, the light may stay out for ten,fifteen miles or it may come on again a few hundred yards up the road,have vag comed it,it shows rear right abs sensor,have replaced this,and ring.same thing happens,have even swapped the leads under the rear seat,and still the same code comes up.its driving me nuts as to what it is....have been given a known working abs unit and ecu,can i swap out the ecu on mine for another,thus eliminating the problem? mine is a 95/96 and the ecu is from a 97/98 car...any ideas would be most appreciated...cheers.. Link to post Share on other sites
Timah89 1 Posted November 23, 2011 Report Share Posted November 23, 2011 did you clear the fault code with VAGCOM after changing the sensor?? Link to post Share on other sites
kentyboy 0 Posted November 23, 2011 Author Report Share Posted November 23, 2011 yep,done that numerous times and it keeps coming back,can clear the code,light goes out,can leave the car running not even move it and after a while the light comes on on its own accord,or if i drive off, the same thing can happen..getting frustrating now. Link to post Share on other sites
VR6Pete 1,455 Posted November 23, 2011 Report Share Posted November 23, 2011 Is your wheel bearing ok? Strange to ask but sometimes if it's on it's way out it messes up the alignment of the sensor and abs ring Link to post Share on other sites
kentyboy 0 Posted November 23, 2011 Author Report Share Posted November 23, 2011 all new pete,done them when the old abs sensor broke off in the stub axle,just replaced the lot new, it was cheaper and easier,and whilst apart seemed wrong not to for what it cost. cant work out why it gave same code when i swapped the wires over under the seat? unless theres a problem with the wire from the back to the ecu..but that doesnt explain why when i go in reverse and then pull away it turns the light out... Link to post Share on other sites
cbmotorsport 0 Posted November 24, 2011 Report Share Posted November 24, 2011 i would check continuity from the plug under the rear seat to the abs multiplug in the engine bay, specifically check for high resitances and short to earths, it may have rubbed through the insulation near the bulkhead grommet, and there may also be water ingress to the ecu multiplug, one checked for continuity and water ingress, if all is good you will be fine to swap the known abs pump and ecu. hope this helps Link to post Share on other sites
Timah89 1 Posted November 24, 2011 Report Share Posted November 24, 2011 is there a way you could fit a resistor to the plug under the rear seats to trick it all into thinking it is working. Link to post Share on other sites
cbmotorsport 0 Posted November 24, 2011 Report Share Posted November 24, 2011 i dont think so, as the abs ecu relies on a pulse feed when driving, when it stops detecting a pulse it throws a fault. as for when you first start the car, it will read that all sensors are there, and the light will stay off, then when you start driving it detects the pulses as above. Link to post Share on other sites
Timah89 1 Posted November 25, 2011 Report Share Posted November 25, 2011 ah right, just a thought as i have faults on both my rears and will be getting rid of the ABS next year anyway and was just looking for a temp fix to kill the light until then! might give it a go anyway, roughly what size resistor would it be? Link to post Share on other sites
cbmotorsport 0 Posted November 25, 2011 Report Share Posted November 25, 2011 take a multimeter and measure the resistance across the terminals of one of the sensors, and use a resistor to match. another way is unplug the light from the dashboard Link to post Share on other sites
Recommended Posts