Trifecta lights with no speedo & MPG gauge
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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? |
Was it raining? If so, could be a short in the wiring. Do you have access to a scanner that can read live data?
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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? |
ABS module. Typical internal failure.
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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 |
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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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Is it possible to swap sensors / connectors left to right to see if the live data + error code moves with it? |
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I will try to swap them over next weekend when im off work. |
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Rear sensor is the same. I would put right to left and old left info right (very good chance that part is not defective). I would use one of the old sensors to make a jumper thar can cross wire left wiring into right wheel & vice versa. |
One thing i forgot to mention is the MPG gauge on the cluster also stops working at the same time, however the tachometer, fuel gauge and temp gauge continue to work. Does this help anyone with the diagnosis?
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https://xoutpost.com/attachments/x5-...315_134556.jpg
There's your problem. The left rear wheel speed sensor isn't reporting the speed of the wheel. Check to see if the wheel is still attached to the truck. |
The mpg gauge on mine did the same and it was a freaking short hitting the metal bar under the dash, caused by me rooting around looking for a switched power during installation of my stereo... don't know if that helps and if there's a point behind the cluster that would have a short that also knocks out the speed sensor [emoji848][emoji1696]
Maybe someone knows... Bueller, Bueller? Sent from my SM-A730F using Tapatalk |
It could be the sensor as oem simenens VDO sensors are the only ones I would use...
https://www.fcpeuro.com/products/bmw...do-34526756380 |
Anytime I had to replace the wheel sensor the plastic connector from the harness to the new sensor had to be replaced also. The wire had to be in the correct location on the new connector, you can't have them switch around. If you replaced the plastic connector did you put the wire back in the correct location? You had a 50-50 chance of getting it right.
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On various models I have owned, it was always a good idea to clean the crud off the pulse ring or pick up surface through the sensor hole with a popsicle stick and Emory cloth. I've noticed rust, grease, dirt and iron filings in there. Anything conductive can disrupt the signal.
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Had the same symptoms with my ABS module and, before putting the engine back in the car, had mine out and sent it to a company in Florida for fixing. They can either fix yours (I did this) or send you one and you send yours back as a core replacement.
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One thing I have noticed is, the trifecta come on when im at a stand still and not moving.
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Swap the rear sensors side to side and see if you get a signal to rule them out...
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BBA Remanufacturing Inc 300 Myles Standish Blvd Taunton, MA 02780 United States 1 508 822 4490 Fax 1 508 822 4491 [email protected] Home (GB) | BBA Reman 3 day turn around via FEDEX. The UK has to have someone also who does these types of repairs. |
ACTronics factory refurbished units also available.
https://www.youtube.com/watch?v=NxumtQskqTY&t=11s |
i have an update for you all.
I swapped both rear and left sensors around. and the trifecta still comes on saying the rear left sensor??? |
So it can either be wiring, a bad ABS module or the pick up ring in the wheel bearing. I would start with what doesn't cost you and check the wiring from the harness side. BBA reman does ABS repairs for around $100 using their eBay sales if they still even offer it there...
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So this means the sensor is ok and the problem is in the wiring or inside the module. You can find the pin out of the module connector and use ohmmeter to test continuity to ensure no broken wires or you make a cross-car jumper so you can connect the left side wiring to the right side sensor.
You actually can probably skip that step because the error you are getting is not a flaky signal you are getting a no signal error. Do you start with no lights and they come on after some time ? The internal fault with the module is often affected by heat and vibration and will have the abs work on and off |
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If i turn the car off for 10-20 mins, and turn it back on, the lights disappear, and then come back on after a while. |
One other thing I wanted to ask was, do these sensors affect when the transmission shifts gears?
I was driving today around 40mph, and the transmission would not shift up and the rev counter was around 4000 rpm, and then suddenly it shifted up 2 gears at once. Did this a couple of times actually. This was AFTER i swapped the sensors around so curious if they control the gear shifting in any way? |
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DME (engine ECU) gets vehicle speed signal from rear right ABS sensor.
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I believe cruise control is controlled by the rear right sensor? |
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