Bosch VP44 - Speed signal sensor VCDS

**Tnick** · 17th March, 2022, 11:07 AM

Hi there,
after checking my car via VCDS Lite few errors i get, one of them was engine speed signal.
I changed it, but after reconecting via VCDS the error stills there, my car is also in "LIMP MODE"
A mechanic told me the second speed sensor is builded in VP44 Injection Pump.

The question is, where can i check if the Speed signal sensor in my injection pump is working properly ?
I really cant find anything on the web :/

Thanks

**pawl** · 19th March, 2022, 07:17 PM

hello only visually, you can check the grooves on the front side, what brand is the shaft sensor?

**Tnick** · 19th March, 2022, 11:03 PM

How do i check the brand of the sensor builded in the pump ? Are there some visible parts ?

**pawl** · 20th March, 2022, 07:00 PM

I meant the shaft sensor in the pump is bosch only they produce

**Tnick** · 20th March, 2022, 09:07 PM

I mentioned above that im talking about BOSCH VP44, this is why i dont uderstand your guestion. Or maybe im dumb a little to understand what are u asking from me. Im hungarian, so i have some dificutlies with other languages, so im sorry if i missunderstand you.
So ...
The speed signal sensor i changed was between the crankshaft and the manual transimison, before was bosch and changed to hella. After change didnt fix the problem. (also i visualy checked it was in pretty good condition)
So if i understand you well enough, i must unmount the injection pump ( because the second sensor is builded in the pump VP44, in other engines like the 1.8t are mounted on the left camshaft)
Ater unmounting i must dissasemble it and check it visually ? Also wanna mention two important things here :
The pump was rebuilded few months ago by bosch certificate service, and its also under 2 year warranty (so i guess its best to send them to inspect? )
The most important guestion : i noticed on a belt change, one of the camshafts is around 4milimeters turned right, everything else "the second camshaft, crankshaft and the injection pump is perfectly timed-so they can be locked on the same time
Can THIS TRIGGER THE SPEED SIGNAL SENSOR ?

Thank you so much for your time !

**pawl** · 24th March, 2022, 09:49 PM

your English is ok my bad and so I can't get out of red, I remembered that there are three types of vp injection pumps and do you have the right one after refurbishment?
my Polish

**Tnick** · 25th March, 2022, 09:01 PM

yes, i do have the same i send them. they fixed it and send me back, same serinal number etc ... i talked to them, the injection pump is under waranty, so they told me i need to send them and they will check ...
Buuut, it takes a few days to send them because they are in Czech Rebuplic ... And takes few hour to disasembly from the engine, but i dont wanna doo it unless im 99 % that the problem is causing the injection pump ...
Today i changed the time belt properly timed the Camhaft with the crankshaft also with the injection pump, the timing is pretty good, starts flawlesly, but i got the same problem,
" LIMP MODE " The Glow Plug starts to blink limited RPM ... NOW THE FUN PART, i tried the car, runs pretty okey, even when in limp mode, then disconnected the MAF sensor, the car was also was in LIMP MODE with Glow plug lighting, but the RPM wasnt limited, i do wanna mention here the MAF Sensor was working properly, aaaaand, after around 4500rpm i heard i small crack, the TURBO i guess, see the following video :
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So fun with the car

**pawl** · 28th March, 2022, 09:32 PM

and what do i show dtc. what errors do you have in the engine?

**Tnick** · 28th March, 2022, 11:45 PM

Actualy it was my oil pressure sesor blowed off , and you can hear it whistle ... i noticed it only the second day ...
Only 1 fault i get, 01126 speed signal error which turned out its the sensor builded in the injection pump. I will send tomorrow to the shop where the renewed it for me, its under 1 year warranty ...
But why the heck did my presure sensor blowed off no idea ... oil level is ok

**pawl** · 29th March, 2022, 09:20 PM

these pumps can sometimes be very troublesome, I once had a wheel turned 180 °and the engine was running

**Tnick** · 30th March, 2022, 06:31 PM

So it might be the oil pump ... hmm, what do you preffer ? Its expensive to change ?
I checked many times the oil level was spot on, but the oil pressure sensor was blinking on higher rpms anyway ...
You are talking about the wheel on the oil pump ? sliped ??

**pawl** · 31st March, 2022, 07:36 AM

I'm talking about the vp44 pump wheel was turned, the car gave a lot of smoke and it worked, I would focus on this dtc 01126

**Tnick** · 2nd April, 2022, 01:42 PM

Oh yes, it happened to me the exact same problem you are described for me 3-4 month ago, lot of smoke car runned but cant get over 3-4k rpm, then i send to rebuild my injection pump...
After sened me back and mounted to my car, the problem was gone ... it had also turned wheel
But i send them to re-check the injection pump because the 01126 code turned out its the speed signal sensor builded in the injection pump, i disconected the pump from the cable, and rechecked the codes via VCDS, and the error code was not there, i get only one code meaning my pump is disconnected ( but thats logical )
So i need to wait few days 3-4 when i will recieve my pump back, and we will see ...
Only one thing i can not explain, why was my oil pressure sensor blowned off