LMM VVT turbo issues

[Big Chris]

I've got a problem with my 08 LMM. It's throwing a P0047 vein position solenoid code. Veins in the turbo aren't working. I've replaced the solenoid and no change. Could a bad vein position sensor cause this code too? Stuck veins possibly? Any help would be great! Thanks

 

[Fastorange]

does the vps work? hook up your flash scan and remove the vps with the scan tool open and the vps off the turbo, push down on the vps and see if it makes a reading.... the wires to the vps are very small and are very easy to pinch or brake them...

 

[blk smoke lb7]

same thing is wrong with my step father's l l y the veins are stuck at 3 percent Bob said there's a plate the cracks in there once in awhile or something like that I had him take a look at it it won't come off 3 percent just got terrible fuel mileage.Bob suggested just change the turbo out as it has 190,000 on it.This his why I don't like a veriable vane turbo.

 

[Big Chris]

I havn't looked at it with EFILive yet. I'm not very good with it. I'm just afraid the turbo is bad. I just dropped the coin on my S366 for the LLY and I really don't want to buy another turbo for the LMM. Can the LLY VVT work on the LMM? I think the vein position sensors are different right? Tuning changes required?

 

[Big Chris]

It probably wouldn't be worth the time to swap my VVT's anyway. LLY runs great but still has 220k on it. Nothing the Visa won't fix! Lol

 

[dbenenh0]

A while back I had problems with my vvt the veins were stuck open and we couldn't figure out why. Took the stock turbo off and apart cleaned it and still no change. Took it to the dealer ship and turned out the vein position sensor ground wire was picking up volts somewhere in the harness and instead of tracing it down they just replaced the harness. Just something simple to check before you waste a few hundred on a new turbo and labor like I did.

 

[blk smoke lb7]

It probably wouldn't be worth the time to swap my VVT's anyway. LLY runs great but still has 220k on it. Nothing the Visa won't fix! Lol

The LLy turbo will work just fine and its a touch bigger then the lmm just install the lmm vane pos sensor in the lly turbo and throw it on.No need to buy another turbo if you have a good 1 sitting there.



BTW no 1st impressions of the silver bullet? What did you think of it the 1st time you layed it to the wood.:woott:

 

[blk smoke lb7]

Another thing you can try Chris is put an eyelit on the end of a wire and ground it by the turbo and wrap it around the vane pos sensor wire the lenght of the pos sensor and then ground it again on the other end.They did this on the lb7s between the ficm and the ecm beacuse it would pick up interferance between the altenator and screw with the ficm or the ecm.I guess the ground cancels out the interferance.That may eliminate the interferance issue if there is 1.May want to ask Ben from BT diesel works if my theroy is correct.Good luck buddy.

 

[Big Chris]

No first impressions of the silver bullet because it is still rocking the box on the shop floor! :woott: I havn't been in too much of a hurry to tear into the only truck i have that runs right.

I still need to get a couple tools and adjust my tunes( or pay Nick to do it) before I start.

 

[chevyburnout1]

The P0047 code is a low voltage code on the solenoid control circuit. It more than likely means the wiring is broken somewhere. The turbo has nothing to do with this code.

 

[Big Chris]

Looks like I need to trace the wire from the solenoid to the ECM. Thanks

This problem started shortly after I installed my dsp5 switch. How often do the wires in the connector that connects to the ECM break or loosen up enough to break the circuit?

 

[chevyburnout1]

I wouldn't say the terminals loosen up very often however mentioning that you just recently had it apart may emphasize that.

A real quick check. Make sure there is battery voltage at the 'ECM/THROT CONT' fuse with the key in the on position.

 

[Big Chris]

Ok I checked the fuse and it was good. 12 volts with key on. I took apart the bigger connector on the ECM (because thats the one i messed with putting dsp5 switch in)and looked it over for nicks or broken loose wires and tried to push all the wires into it better. Still have the code.

 

[chevyburnout1]

So if that is the case then it more than likely means either one or both of the wires running to the solenoid are either broken or shorted to ground somewhere. Check for circuit continuity and short to ground from the ECM terminal 48 to the solenoid connector terminal that has the DARK BLUE wire running to it. And then perform the same test from the ECM terminal #96 to the other solenoid connector terminal, which should be WHITE.

Hopefully that narrows down your issue. Here's a picture of the ECM X1 connector to help out. Be very careful with probing anything into the ECM connector.

 

[Big Chris]

:woott::hug:. You are the man! "mistery fix" lol. I had continuity for both wires. I pushed those two wires in the connector. I didn't feel them move but turbo veins work and the codes are gone. THANK YOU

 

[chevyburnout1]

Good to hear! :thumb: