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Discussion Starter #1
I had some damage to wiring loom a while back when i fitted incorrect coil pack and a specialist garage fixed the wiring.I had got a spare ecu also but original was ok.Some of the wiring loom had been damaged and since then the abs and serv light is on.I suspect that this is from the same occasion and there may be an issue with ABS ecu? I checked the fuse 10a and it is ok.I am wondering if someone could advise me the best way to trouble shoot my issue as i cannot get a warrant of fitness. I believe the codes that were read may be pointing to the rear which are drums and i can do some basic checks there but logic would suggest otherwise as the damage happened at the same time.Thoughts to trouble shoot please? Car appears to be fine in all regards driving wise.
 

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Discussion Starter #2
Furthermore I have a spare ECU to suit the vehicle and if i change it still comes up with the same ABS/SERV lights.
The garage that did the loom repair noted the abs and serv light on but said they could not read the codes.
The codes they stated were 502F and 503F which may mean something to someone but seems like wrong code reader?
 

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Super fantastic Mod Technical Supremo Nice Guy
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Both rear speed sensor circuits..
Those faults are,,

So unless you have had some work done on the back of the car, Then its checking the circuits with a meter, ..
Post a picture of the multiplug that fits on the ABS pump, showing the pins , and will see if I can mark the 4 offending pins for you
 

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Discussion Starter #4
Ok will do.No work has been done on the rear.Will try and take a photo also showing pins.Would this be consistent if ecu in abs was damaged or loom issue? Fuse under bonnet?
 

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Discussion Starter #6
I used a scanner to erase codes but i don't know if it worked. The lights are on permanently at this stage.i tried to release the connector on the abs pump but no luck yet finding how to release it.
 

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Super fantastic Mod Technical Supremo Nice Guy
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Bottom row going from left to right looking how you have posted the picture, First small connection is number 15,, counting along it ends at pin 5
10th pin along Rear left-hand speed sensor supply(pin 6)
8th pin along Rear right-hand speed sensor supply( pin 8)
Upper row First small connection is pin 26 counting along it ends at pin 16
Pin 17 is Rear left-hand sensor signal

Pin 19 is Right-hand rear speed sensor signal.
Cannot get your picture to enlarge to mark it with paint..
 

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Technical Supremo, Platinum, I let the Dogs out
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I will help you out Stu, I am nice like that, hopefully I have translated correctly


Yellow - Pin 6 - Rear left-hand speed sensor supply
Blue - Pin 8 - Rear right-hand speed sensor supply
Red - Pin 17 - Rear left-hand sensor signal
Green - Pin 19 - Right-hand rear speed sensor signal


the colours used are purely to differentiate between pins and bare no relation to the colour of the wires that are attached to the pins
 

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Super fantastic Mod Technical Supremo Nice Guy
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where have you got your colour codes from. Just asking as Renault say themselves..
Dont rely on colour codes as the loom could have been made anywhere..
 

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Technical Supremo, Platinum, I let the Dogs out
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I forgot to add to the bottom of the post - the colours used are purely to differentiate between pins and bare no relation to the colour of the wires that are attached to the pins - sorry


that ommision has been changed
 
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Discussion Starter #12
I have done a drawing so that i am clear in what i am doing.
Am i now to do a continuity test between (6 and 17) and (8 and 19) or what do i do here to test.
Will this test say if everything back from this point is ok or not?
Thanks so much for the help!
Cheers John.
 

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Discussion Starter #13
Should i try and do a resistance reading? What figures am i looking for?
I can test it easily enough at the abs cable connectors towards the back of the car.
Thanks for the advice. John
 

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Discussion Starter #15
Thank you. I tried to get a resistance by undoing the connector toward the rear and seemed to be getting nothing so i wonder if both rear speed sensors got damaged at the same time i had the issue with the incorrect coil pack and damage to the loom. I struggles to get a reading on the female connector but that could be because that speed sensor is also damaged.The car has drum brakes on the rear and those speed sensors appear to be different? I took off the drums and cleaned the surface of the sensor and the resistor ring but to no avail so i strongly suspect that the speed sensors have perhaps been spiked or something. I am waiting on an icarsoft diagnostics but i will do the resistance thing one more time and really i guess that just means fitting new speed sensors.I imagine the damage will be limited to that? I understand the resistance should be about 1000 to 2000. I think i should get new speed sensors to suit.The car is 2004 1.2 16v. I will try and figure out the correct replacement sensors. Regards John
 

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Discussion Starter #16
I notice some listings for replacement sensors say for vehicles without esp which i presume my car is without?
 

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Super fantastic Mod Technical Supremo Nice Guy
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Explain..

Cleaned the sensor and the Resistor Ring
This is a magnetic covering, was it just a careful wipe, or something more than that
 

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Discussion Starter #19
Was just a careful wipe with a paper towel to remove the carbon type build up on the resistor ring and a careful wipe of the sensor. I will test again with some finer probes for multimeter to get to the female connection and i presume if no resistance then sensors are damaged? Could it also be the resistor rings?
Regards,
John
 

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Super fantastic Mod Technical Supremo Nice Guy
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There's a good chance its just the sensors,, have you got a code reader..

Not all ABS lights will go out on cars, so you could cure the fault but the code is still stored..

If its costing you money everytime to get the code switched off.
Then its fit two new sensors, and go from there..
You have now tested the wiring down from the ABS plug to the rear,, Its put a piece of thin wire ( Paper clip is great for this), in the ABS sensor plug at the back of the car, and with the two probes off the multimeter check at the abs main plug..


Careful with your probe tips, I tend to put two sewing needles in the points/connectors that need testing, so not to damage or open up the small connectors inside the abs multiplug if these prove the wiring is good, then its usually just the sensor
 
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