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-   -   Trifecta lights with no speedo & MPG gauge (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/111655-trifecta-lights-no-speedo-mpg-gauge.html)

Loperamide 03-14-2020 10:39 AM

Trifecta lights with no speedo & MPG gauge
 
2 Attachment(s)
I have changed the rear left wheel speed sensor with a brand new Pagid brand, however the trifecta lights returned after some driving.

The speedo also stops working at the same time.

What could be causing this?

ahlem 03-14-2020 07:08 PM

Was it raining? If so, could be a short in the wiring. Do you have access to a scanner that can read live data?

Loperamide 03-14-2020 07:11 PM

Quote:

Originally Posted by ahlem (Post 1179637)
Was it raining? If so, could be a short in the wiring. Do you have access to a scanner that can read live data?

If there was a short due to water ingress, then trifecta would be on at all times would it not?

Trifecta only comes on when car has reached operating temperature.

I think the scanner I have can read live data. What am I looking out for?

Clavurion 03-14-2020 07:26 PM

ABS module. Typical internal failure.

Loperamide 03-14-2020 07:34 PM

Quote:

Originally Posted by Clavurion (Post 1179639)
ABS module. Typical internal failure.

Would that stop the speedo working also? I don't see the link.

Clavurion 03-14-2020 07:45 PM

Quote:

Originally Posted by Loperamide (Post 1179640)
Would that stop the speedo working also? I don't see the link.

Yes. The module internal failure is usually on the sensor wiring from the connector to circuit board. So causing similar symptoms as a broken wire between the sensor and module. A relation to heat is usually a tell tale that the fault is caused by module internal wiring.

Loperamide 03-15-2020 07:21 AM

Quote:

Originally Posted by Clavurion (Post 1179641)
Yes. The module internal failure is usually on the sensor wiring from the connector to circuit board. So causing similar symptoms as a broken wire between the sensor and module. A relation to heat is usually a tell tale that the fault is caused by module internal wiring.

is there any way to confirm it is the module before I start throwing money at it?

Clavurion 03-15-2020 08:07 AM

Quote:

Originally Posted by Loperamide (Post 1179656)
is there any way to confirm it is the module before I start throwing money at it?

As the symptoms the same as failed sensor or its wiring to module there is no way to test it on 100% certainty. Though you can measure the sensor line via module wiring connector to rule that out. There are instructions for this on similar threads on this forum.

andrewwynn 03-15-2020 11:29 AM

I would tap splice a different sensor that is working. Use some thermostat wire, splice in without cutting the wires just the insulation to the right side.

Use the plug from an old sensor to connect to car side.

Unplug left and right rear sensors and you can do two tests:

1) connect left wheel sensor to right car fitting.
2) connect right wheel sensor to left car fitting.

You could do one at a time or both at once.

If the speedo starts working and the computer sees the "left", indications are the problem is inside the wheel:,eg bearing tone ring.

If the problem stays on the "left" now the right wheel, indication is the wiring or the module.

When the bond wires fail in the module, the usual symptom is some intermittent problems as they touch some or most of the time then eventually a no signal in one or more wheel

Loperamide 03-15-2020 03:12 PM

6 Attachment(s)
I have attached some more pics of INPA while moving, to see if it would help anyone diagnose this more specifically, and also a short video clip of the Live Data.

https://www.youtube.com/watch?v=y-VPu1zXR0M


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