Rob W

sorry, i have been away for a while. i have put everything back together now. i'm confident that the wiring to the ABS ECU is fine now. annoyingly, after it was all put back together last week, i was able to drive it for some time at speeds upto 60mph without the light coming on. it was only when i stopped that the light came back on. i am know getting feed back through the pedal and can hear the pump working. same fault is back. frustrating!!! i have already sent my ABS Pump to be checked and it was returned saying that all the valves are working correctly. as the fault is intermittent, i feel that the fault still lies within the pump. i'm aiming towards the PCB drying up. I'm taking it of on Wednesday to have a look, hopefully remove any oxidation deposits, then i am giving it another full bleed. i know it will pass an MOT with this intermittent fault, but its so annoying when you can't find the fault to repair it.

do you have a UK electrical diagram, i could probably use that right now. my issue is the light coming on intermittently. the sensors are all good. the hyd unit is good. looking at the wiring going into the ABS control unit, it looks like some one has soldered some wires together. so i'm a little concerned that their is a fault in the wiring somewhere, i just don't know where right now.

I am currently chasing electrical faults around the car, but looking at the electrical diagrams i have (Bentley and Mitchell Repair), they both seem to be the same, but the reality of the wiring going into the unit is somewhat different. i am concerned that a previous owner replaced the Control Unit, which differs from the original, and has tried to re-wire it to work (but failed). the serial number at the bottom is 1H0 907 379 E (10.0941-0321.4 3X1559). i have attached the wiring going into the unit and how it differs from the circuit diagrams i have. i feel that i need to start to chase wires to ensure that it is the same as the 2x diagrams i have. if any of you are able to assist or offer any thoughts or experiences with similar issues, i'm all ears. i only need to get this sorted, then MOT here i come. many thanks in advance.

Well, i think I'm getting somewhere. just been able to get back to working on the Rado as i've been away with work for a while. i sent the ABS Pump off to the company used on 'wheeler Dealers', unfortunately/fortunately, they informed me that the pump was all ok. Now i have it all fitted, and bleed the system and i still had feed back coming through the brake pedal whilst driving and the light came back on. it was then i realised that there is a bleed valve on the M/C. well, i didn't know that. so much air came out of it there was a sense of relief. Finally, the feed back form the pedal has now gone. the light still remains. i looked at the ECU this afternoon and noticed that the pins were badly corroded. this was due to the heater matrix fault when i acquired the Rado. all cleaned up and and all back together. from there i checked all the sensors resistance from the ECU harness back and found the F/L sensor is only reading 780 ohms, not the 1-1.3k ohms required. F/L sensor is now on route and i am hopeful that this all the issues dealt with for the ABS. Fingers crossed, i'll have my Rado in for its MOT within the next few weeks. i hope!!!

im in Wiltshire. thanks anyway. i renewed discs all round and new rings when i changed the rear hubs.

just been in touch with the company, 160 for them to collect, repair and deliver. seems a bargain. hopefully gonna get it plugged in to a decent OBD1 next week and check the faults over first.

all tyres are the same all round. What do you mean 'Scanned it', are you talking about plugging the diagnostics into it? if yes, then i have plugged it in but i think i bought a crappy one from china, it won't let me erase all faults to conduct a full check. I'm getting a friend to lend me theres hopefully next week to see if i can get any other feedback.

Yeah, i had that in mind, but I'm hoping to cover all the easy bases before i start to take the ABS pump of to repair/overhaul. Just by chance, do you know of anyone who does the ABS pump overhaul?

I've checked the ABS Cage and there was no distortion. I've checked the circuit board on the light and all seems fine, annoyingly the ABS works fine! but still, once i go over 10-15cmph, the light comes on and i know that once its on the MOT roller brake test the light will come on and FAIL!!! thanks for the above ideas, but it seems that neither have sorted my issue out. id be glad for any other thoughts out there.

Sounds good, I’ll give it a try tomorrow. Fingers crossed. Many thanks

although I've been through this thread many times, it seems that the dreaded ABS light issue won't go away. i am getting my Rado (VR6 1994) ready for MOT, and all it needs, other than a bit of welding, is for me to get the ABS light to go away for good. on initial start up, light goes on, then off. then after a short period comes back on. i have from time to time felt the pedal vibrate as it pushes back at low speeds, but this has only happened after it has been sat for a while. all sensors are new, showing >1K Ohms when checked. the sensor cages are also new. the 30A fuses under the left dashboard seem to be good. I've tried to give the brakes a good pressing when driving to try and 'un-stick' the valves in the ABS pump, but still, no change. i see that some of you on this thread may have had this issue, albeit, a few years ago, is there any other areas to look at before i start to look at getting a refurbished ABS pump. many thanks in advance.

Do you have the Front Indicators, the clear ones?

Do you have the Front Indicators (Clear)?

Rob, do you still have a front left indicator unit/lense. Mine has a crack all the through and i'm trying to get it ready for its MOT.

just checked, due to some of the terminals, it can't go in the right way. never the less, its in and it works. more fault finding needed. Thanks for your help !