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ABS wiring



  Peugeot 205 GTI Mi16
I'm trying to put the ABS light out on my friends 2000 X reg Clio II RS 172, reg X459 DYB which seems to have been owned by a few members on here in the past.

The ABS light was on when he got the car so I don't know all the history.

I read the fault codes and the only ABS code is showing a dead offside front sensor. I replaced the sensor and the fault persisted. The new and old sensors both work fine on the nearside so I am sure the sensors aren't the cause of the fault.

Autodata and the Haynes manual both have wiring diagrams for the ABS and both show the OSF sensor going to pins 3 & 5 of the ABS controller. I checked for continuity from the sensor connector in the wheel arch to the relevant pins and pin 5 was fine but there was nothing to pin 3. Thinking I'd found the fault I unwrapped the wiring loom and discovered two lengths of wire spliced in with solder that didn't look too good but did seem to be connected. I removed them and spliced some new wire in with solder sleeves but this didn't solve the fault and there was still no continuity between the sensor and pin 3 on the controller plug.

At this point I took the back cover off of the ABS controller plug and I found that the wires from the offside front ABS sensor actually go to pins 4 & 5 (not 3 & 5). There is a rear ABS sensor connected to pins 1 & 3 and this works fine so it seems that both the Haynes manual and Autodata have the same error in their wiring diagrams, this seems unlikely to me? Does anyone have a pin out for the ABS controller that shows the OSF sensor going to pins 4 & 5?

At this stage I definitely have continuity between the (tested & working) sensor and the controller but the fault persists so there must be something else going wrong but without a wiring diagram that corresponds to the car I am not sure what to do next. The wiring has definitely been messed about with so I guess it is possible someone swapped some pins over on the ECU connector but it seems unlikely and it isn't as simple as swapping the sensor to where the diagram shows as one of those pins is in use by another sensor that is working.
 
  Clio 172 Merc ML55
What's the condition of the pick up ring on the cv joint? Assuming Ph1's use the same system as ph2's
 
  Peugeot 205 GTI Mi16
It looks OK and the fault code returns without even moving the car and I don't think it could detect a fault with the ring until the wheels turn.
 
By what you've said it seems like it will be the loom/harness from pump (CPU) to the front sensors if it's been bodged. Saying that I've had a CPU failure before so could also be that. Maybe best getting your mate to get the car hooked up to CLIP to rule out a CPU failure, then if it's not see if you can get a loom/harnesses from someone breaking a 172.
 
  Peugeot 205 GTI Mi16
I'll get an oscilloscope on it tomorrow to see if the signal is actually reaching the controller plug intact, it's only two wires so if the signal isn't getting that far or is distorted I'll cut it all out and replace it with new wire all the way end to end.

The problem I have is the connections on the car not matching two different wiring diagrams, has anyone else come across this? Is there more than one type of connector used on different years maybe? I did try setting Autodata to a year or two earlier and later than 2000 but it shows the same pinout, and the Haynes just has one diagram for all years.
 
  Peugeot 205 GTI Mi16
This is the wiring to the controller plug, the top row of pins start with 1 on the left and these are the connections I'm seeing:

1+3 offside rear sensor
4+5 offside front sensor
6+7 nearside front sensor
8+9 nearside rear sensor

Haynes and Autodata both say:

1+2 offside rear
3+5 offside front
6+7 nearside front
8+9 nearside rear
 

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  Peugeot 205 GTI Mi16
I've been looking at Autodata again and it does actually have variations on the diagram for different ages of car, they're on some tabs that I missed earlier.

However the diagram I was looking at is for models made up to May 2000 so it should match the car, the next one covers June 2000 to March 2001 and while it is slightly different in some ways the connections to the sensors are on the same pinouts as the first diagram. The last one is March 2001 onwards but it is very different and doesn't apply to this car.
 
  dan's cast offs.
autodata wrong? you'll be telling us the tooth fairy doesn't exist next :wink:

autodata is far from perfect. get it on clip, look at live data and take it from there.
 
  dan's cast offs.
will see if i can find my wiring diagrams and get the abs for you but don't think i've got them at home.
 
  Peugeot 205 GTI Mi16
Thanks. I've looked at the live data on my snap on solus pro and I can see wheel speeds increase when I spin the three good wheels but nothing when I spin the offside front.
 
Thanks. I've looked at the live data on my snap on solus pro and I can see wheel speeds increase when I spin the three good wheels but nothing when I spin the offside front.
A solus pro told me I had a duff NSR sensor as live data was reading 2000kph on a live data run, all the other 3 wheels where reading correct speeds. I spent £120 on the sensor which didn't work, then changed the loom and that also didn't work. Turned out to be an ABS CPU fault in the end once put on CLIP.
 
  Peugeot 205 GTI Mi16
I read your thread saying that when I was searching actually. You can't blame the solus for that IMO, I hate to say it but that is operator error really, if it is showing an impossibly high speed it means a high frequency signal is leaking in somehow, it can't possibly be caused by a sensor fault. All it can be is external interference or a signal already in the controller bleeding over.

This car is showing zero KMH on one corner so there is no signal at all.

I do agree that manufacturer specific software is always the best solution but if you work on more than one type of car there is nothing wrong with something like a solus as long as you think through the implications of what it is telling you which admittedly takes experience.

I haven't had time to get the 'scope on this car yet but I'll keep this thread updated when I do.
 

MicKPM

ClioSport Trader
  Clio16v/Zoe Z.E.50
Sorry for the poor image but our screens refresh rates are designed to stop this s**t.

IMG_3495.jpg


The O/S/F sensor is component '152' so pins 3 and 5
 
  Peugeot 205 GTI Mi16
Thanks for that. I was hoping it would be different to autodata but it is probably where autodata actually got their info in the first place. I wonder if a mistake has been duplicated by autodata and haynes? Has anyone actually checked the continuity of their abs sensors and found the diagram to be wrong? (or found it to be right for that matter?)
 
  Clio mk2 2004
My Clio mk2 model 2004 1.4. 16 v. Show fault both rear abs sensor and I replaced both of rear sensor and both rear rings but still abs not working and show rear abs sensor and we put the car on clip and test speed for front wheels and rear wheels we found in front speed ok and rear speed zero and also checked rear sensor wiring is good and we replaced the pump but abs still not working
 
  Clio 172 Merc ML55
Have you checked the main wiring connector underneath the car? It's by the front subframe support brackets
 
  Clio mk2 2004
Have you checked the main wiring connector underneath the car? It's by the front subframe support brackets
Yes and we checked segnal from rear sensors is working and I replaced rings and sensors and pump and main master but still not working
 
  Clio 172 Merc ML55
Have you continuity checked all the wiring for the ABS? Personally I'd do it between each connector rather than at once (assuming you haven't already)
 
  Clio mk2 2004
Yes all wiring is connected well and I disassembled the rear right sensor and turned on engine and test the sensor it work because it be magnetic and turned off engine the sensor is off magnetic it mean it connected well
 


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