P38 new problem with abs and traction fault

[Datatek]

here’s a thing.
This truck is on springs!
Could that trigger the ABS/TC dash lights?
It’s in the WABCO D section on my nanocom?

No

 

[MontyChambers]

Nanocom EDC, WABCO
Pics of ABS sensors. Gently tapped in and seated with a copper mallet.
The connections have been cleaned and where they should be.

 

[MontyChambers]

I found another reading regarding brakes
Low high brakes at rest
High low pedal depressed
The WABCO D brake readings ars still close/close-open/open!

 

[pwood999]

Your pictures show Open/Close and Close/Open - exactly as it should be.

Where are you seeing both closed at same time, or open at same time ? Take a video & upload it to YouTube. Then paste the link here.

 

[kermit_rr]

Nanocom EDC, WABCO
Pics of ABS sensors. Gently tapped in and seated with a copper mallet.
The connections have been cleaned and where they should be.View attachment 341708View attachment 341709View attachment 341709View attachment 341708

I'm not sure what's going on there but something isn't right.
I can't remember but that doesn't look like the right location.
You shouldn't see the ABS ring and the sensor should be mm away not cm's

 

[Datatek]

Sensors tapped in with a copper mallet? They should be a push fit, pushed in until they touch the reluctor ring. They will then self adjust the clearance when you drive the car. If the needed hammering in they may be damaged.

 

[pwood999]

Even the CV joint looks wrong ?? Usually the hub obscures that.

 

[Datatek]

Even the CV joint looks wrong ?? Usually the hub obscures that.

It does indeed and the sensor does not look like it's anywhere near the reluctor ring.

 

[FEI]

I'm not sure what's going on there but something isn't right.
I can't remember but that doesn't look like the right location.
You shouldn't see the ABS ring and the sensor should be mm away not cm's

No that assembly looks right to me.
I suspect what you referring to as the abs ring is the cv boot clamp.

There is a steel cup that sits around the main cv body. This steel cup has a hole through which the abs sensor sticks. The steel cup is there to keep mud out of the abs ring.

But my conclusion from those pictures is that the sensor is not in deep enough. It looks like the sensors tip is about inline with the protector cup thing. The sensor should be sticking into the cup by about 5-10mm from memory.

 

[Grrrrrr]

Nanocom EDC, WABCO
Pics of ABS sensors. Gently tapped in and seated with a copper mallet.
The connections have been cleaned and where they should be.View attachment 341708View attachment 341709View attachment 341709View attachment 341708

My ABS sensors go into a little mesh bush which sits almost flush with the hole. Is that a rubber bush on yours? Maybe the Thor was different.

 

[DanClarke]

My ABS sensors go into a little mesh bush which sits almost flush with the hole. Is that a rubber bush on yours? Maybe the Thor was different.

My Thor has them in little copper lattice/basket tubes as well.

 

[Datatek]

My Thor has them in little copper lattice/basket tubes as well.

Both my diesels have the copper/beryllium carriers for the sensor.

 

[marjon]

My Thor has them in little copper lattice/basket tubes as well.

Both my diesels have the copper/beryllium carriers for the sensor.

Look at his second pic and I think you can see a little bit of copper showing.
It’s not easy to see if it has gone in far enough though.

J

 

[MontyChambers]

My ABS sensors go into a little mesh bush which sits almost flush with the hole. Is that a rubber bush on yours? Maybe the Thor was different.

No, they do sit in a copper mesh bush. The rubber just sits on top but hasn't stop the sensor bedding down.
In all this searching for the cause of the ABS-TC dash lights being constantly on I want to try and understand the systems that could lead to this happening:
The readout from the dash states: ABS failure, Traction Control failure, lights are on.
The nanocom shows 'no fault' and never has. The systems the nanocom monitors are presumably working correctly, or the nanocom is unable to detect what the vehicle's systems are displaying.
So to focus on the reason why this fault is showing up, do we not have to look more closely at the data the ECU, WABCO D, or other vehicle monitors are reading that is outside the purview of the nanocom?

 

[FEI]

When a fault occurs the abs ecu always logs it into its memory. It then tells the BECM that it has an active fault. The BECM then instructs the instrument cluster to turn on the ABS/TC lights and display the messages.
So if there is a fault the abs controller wont instruct the BECM to indicate a fault without the first logging one in its memory.

So the conclusion i make from the fact that you have no stored faults but still have warning lights is that there is a connection issue between your ABS controller and BECM.

Does the dash display the the ABS failure and Traction failure messages immediately after turning on the ignition or after starting the engine or after driving for abit?

 

[MontyChambers]

Check the switches with a multimeter. Also check the ABS ECU inputs for 12V when you press & release the pedal. Look through the RAVe diagram for the most convenient points.

You could also try the other ECU inputs. Several of them show the brake pressed status (EAS, BECM, Cruise).

start up settings there is a list of options:

For the purpose of this diagnosis which of the settings should I try to discover the ABS-TC fault?
NORMAL
ADRE.APP
ALM.APP
APPMAM.APPAS10.APP
BECM.APP
CANDET.APP
CANINST.APP
ETC.....

 

[MontyChambers]

When a fault occurs the abs ecu always logs it into its memory. It then tells the BECM that it has an active fault. The BECM then instructs the instrument cluster to turn on the ABS/TC lights and display the messages.
So if there is a fault the abs controller wont instruct the BECM to indicate a fault without the first logging one in its memory.

So the conclusion i make from the fact that you have no stored faults but still have warning lights is that there is a connection issue between your ABS controller and BECM.

Does the dash display the the ABS failure and Traction failure messages immediately after turning on the ignition or after starting the engine or after driving for abit?

I Key in, turn to light up dash then ABS failure and Traction failure messages, windows not set, sunroof not set...
So, the windows, sunroof etc are physically closed but the BECM is not getting that input as well!

 

[MontyChambers]

When a fault occurs the abs ecu always logs it into its memory. It then tells the BECM that it has an active fault. The BECM then instructs the instrument cluster to turn on the ABS/TC lights and display the messages.
So if there is a fault the abs controller wont instruct the BECM to indicate a fault without the first logging one in its memory.

So the conclusion i make from the fact that you have no stored faults but still have warning lights is that there is a connection issue between your ABS controller and BECM.

Does the dash display the the ABS failure and Traction failure messages immediately after turning on the ignition or after starting the engine or after driving for abit?

I want to disconnect the battery and gently clean all connectors on the BECM, I have a small copper wire brush and contact cleaner. The white calc residue that forms on old connectors needs to be removed me thinks?

 

[Datatek]

I want to disconnect the battery and gently clean all connectors on the BECM, I have a small copper wire brush and contact cleaner. The white calc residue that forms on old connectors needs to be removed me thinks?

Any white residue will cause problems.

 

[Datatek]

I Key in, turn to light up dash then ABS failure and Traction failure messages, windows not set, sunroof not set...
So, the windows, sunroof etc are physically closed but the BECM is not getting that input as well!

Windows not is what you get after the battery has been disconnected and is normal.