P38A ABS & TC fault. - FIXED!

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DanClarke said:
UPDATE:
Part arrived at lunchtime.
Did some further testing before fitting it (Front Right) sensor.
Pulled the connector on the Front left and probed for voltages there. Same as the Front Right Socket 3.3V on one pin.
Measured the resistance across the pins of the new part 1.4kOhms.
Pulled the old existing ABS sensor off the front right and measured the resistance across that, did not register any reading (other than Out of Range) until I put it on the 2Meg Ohm range , at which point it said 1.04 megOhms..
Put the new sensor on, cleared the faults with Nanocom, no more ABS/TC fault messages on ignition on. Test drove and all OK.
So definitely a duff sensor. Why it went kaput after a thrash I don't know.

Q. Why/how would thick black sooty grease get deposited on the end of a sensor? Does this imply a leak from the hub?
Other bad news to come.... the suspension bags look really gnarly and cracked. :(
Click to expand...
Sounds like the wheel bearing is loosing its grease and collecting brake dust time for a new bearing.
 
DanClarke said:
One other minor detail was that the 3 original ABS Sensors reported a perfect 2.33V in Nanocom on stationary vehicle ignition on (only time the Wabco-D module can be contacted by Nanocom). The new OEM one only reports 2.13V.
The Wabco ECU seems not to mind though.
Click to expand...
The static voltage is only part of the story, it will be the peak to peak waveform that matters, you an only check that with a scope
 
The clamps holding my CV boots rusted off.
Causing grease to go everytwhere, maybe worth checking to see if the clips are still doing their thing.
 
Grrrrrr said:
Yes, you're right and I think it was the WABCO-D that did it but not sure which screen. @martyuk did a post on it somewhere.
Click to expand...

The fault codes that Nanocom reports from the ABS ECU are true to what corner is is... so if Nanocom shows a fault reported on Front/Right, then it IS Front/Right where the fault lies.

The discrepancy on Nanocom comes from the live data screens - where it shows the data from each sensor, but the labels are wrong on 3 of the corners. I dug out my notes, and these are what Nanocom says vs the actual sensors on the vehicle:

Front/Right on Nanocom IS Front/Right on the vehicle (the ONLY one which is correct)
Rear/Right on Nanocom is Front/Left on the vehicle
Rear/Left on Nanocom is Rear/Right on the vehicle
Front/Left on Nanocom is Rear/Left on the vehicle

So if Nanocom in the faults section said there was an issue with the Rear/Right sensor on the vehicle (for example)... then this WOULD be the Rear/Right vehicle sensor - BUT if you went into the live data to look at the sensor voltage, you would see something wrong with the voltage reading on what Nanocom says is the Rear/Left sensor.

There are a couple of labelling discrepancies in the HEVAC too (from memory the LH/RH sides for temp and seat heaters). I did mention this to BBS a few years ago to ask if the labelling could be updated in a future Nanocom software version, but to my knowledge this hasn't yet happened.

The difference in voltage showing on the ABS ECU is probably due to a slightly different resistance of the aftermarket sensor. But as long as it's close and not reading 0V, then the ECU should pick up on a decent waveform from it and be happy.
 
Pete The Biker said:
The wife's Peugeot managed to send her sensor kaput while parked on the drive!

Pete
Click to expand...
On some cars, if the handbrake is put on just so it illuminates the park lamp.
Each wheel can be turned and a warning will beep as car thinks its moving with the handbrake on! A duff sensor won't tell it its moving. Only on some cars /models. ;)
 
Mark Piercy said:
On some cars, if the handbrake is put on just so it illuminates the park lamp.
Each wheel can be turned and a warning will beep as car thinks its moving with the handbrake on! A duff sensor won't tell it its moving. Only on some cars /models. ;)
Click to expand...
Hi Mark. No, the sensor was open circuit, so got ABS warnings as soon as the ignition was turned on. The car hadn't moved at all!

Pete
 
martyuk said:
The fault codes that Nanocom reports from the ABS ECU are true to what corner is is... so if Nanocom shows a fault reported on Front/Right, then it IS Front/Right where the fault lies.

The discrepancy on Nanocom comes from the live data screens - where it shows the data from each sensor, but the labels are wrong on 3 of the corners. I dug out my notes, and these are what Nanocom says vs the actual sensors on the vehicle:

Front/Right on Nanocom IS Front/Right on the vehicle (the ONLY one which is correct)
Rear/Right on Nanocom is Front/Left on the vehicle
Rear/Left on Nanocom is Rear/Right on the vehicle
Front/Left on Nanocom is Rear/Left on the vehicle

So if Nanocom in the faults section said there was an issue with the Rear/Right sensor on the vehicle (for example)... then this WOULD be the Rear/Right vehicle sensor - BUT if you went into the live data to look at the sensor voltage, you would see something wrong with the voltage reading on what Nanocom says is the Rear/Left sensor.

There are a couple of labelling discrepancies in the HEVAC too (from memory the LH/RH sides for temp and seat heaters). I did mention this to BBS a few years ago to ask if the labelling could be updated in a future Nanocom software version, but to my knowledge this hasn't yet happened.

The difference in voltage showing on the ABS ECU is probably due to a slightly different resistance of the aftermarket sensor. But as long as it's close and not reading 0V, then the ECU should pick up on a decent waveform from it and be happy.
Click to expand...
Thanks @martyuk its good to know.
 
Hi I have a abs light on 1 of my p38s nanacom says right hand sensor gap but ring was damaged put new ring on and new sensor still got fault.the other problem i have is when i press the brakes there is a grunting noise when I press the brake pedal sometimes it goes away.now my nanacom no comunication coming up.thanks in advance
 
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