LLY Vane Pos Issue

[Yellow Jacket]

I'm having trouble with my own truck, I put a Fleece 63.5mm Cheetah on it. It's been setting for over a year due to needing an engine. There hasn't been a VGT charger on it since 2008.

The Vane Position Sensor is not reading correctly... It is acting like an on/off switch in the ECM (when watching with a Tech 2)... It is at 100% with it plugged in and when I slowly apply it with my hand, it goes over the half way point and drops to 0%...but on my brother's 06 it sweeps fine, I ohmed out all three wires back to the ECM and they are .1-.2 ohms...so they seem OK, can there be anything flakey in the ECM? Or do I need to check something else?

 

[clrussell]

I had one doing something similar.. Would work one day and not the next.

Ended up some tech at a dealer had fat fingered the pins at the ecm and had em wallered out. Talk about a hot dog down a hall way came to mind..


Three new pins and it was good to go. (Harness side)

Check your ecm pins. What I'm sure happened it someone stuck a test pin in the harness side pin to check the wires and it was to big which in turn made the socket side to large to make good contact.


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[Yellow Jacket]

I'll check that out, it's not throwing any faults and is reading what otherwise seems OK, but it just keeps cycling the actuator jumping from 0%-100%...wish I had 3 new LLY pins and wires from Ben, I'd jump from ECM directly to the connector...

 

[Yellow Jacket]

Ok, tried an ECM from another LLY truck and Vane Position reads fine with a Tech 2...went back to my ECM and not working...

Could I have changed something in a tune that's not letting it read correctly? I can't find any sort of a Vane percentage table that I could of messed up...

 

[Harbin_22]

Try the stock tune?

 

[Yellow Jacket]

Installed his tune in my ECM, same problem... Put my tune in his ECM and the sensor reads accurately. Looks like I have an LLY ecm only good for VGT delete.

Getting this thing back up and running has been a nightmare! First it was the injectors, then this ECM issue, which I assumed would fix the Vane Solenoid cycling constantly (but not full cycle). If I turn key on engine off, I can push in on plate opposite of actuator connector really easy and get it to read 98%, I start it and oil pressure pushes it back to 0%, and it just keeps making short/quick pulses, I try to push it in and it's tough to overcome the oil pressure and I can feel the cycling/pulses... I'm not sure what the hell is going on now!!!

 

[clrussell]

I've got an ecm like that too lol. Actually happened when I left the vane control sol unplugged during a repair. Then they drove it a couple days before they brought it back.


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[Yellow Jacket]

Well due to the unlimited cycling of the Turbo Vane Actuator, I swapped it with a known good one. Fixed that now too!

How do I have this luck??? Bad Actuator and bad ECM, tried my ECM in other guys truck with his tune, and Vane Percentage jumps from 100% to 0%... Nothing in between, now the search for a LLY ecm begins!

 

[clrussell]

Well due to the unlimited cycling of the Turbo Vane Actuator, I swapped it with a known good one. Fixed that now too!



How do I have this luck??? Bad Actuator and bad ECM, tried my ECM in other guys truck with his tune, and Vane Percentage jumps from 100% to 0%... Nothing in between, now the search for a LLY ecm begins!

I have one.. Came from salvage yard. I have no way to test it if its any good. If you want to try it and it works then we can talk $


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[duratothemax]

Well due to the unlimited cycling of the Turbo Vane Actuator, I swapped it with a known good one. Fixed that now too!

How do I have this luck??? Bad Actuator and bad ECM, tried my ECM in other guys truck with his tune, and Vane Percentage jumps from 100% to 0%... Nothing in between, now the search for a LLY ecm begins!

Ill take the bad ECM off your hands

 

[Yellow Jacket]

Ill take the bad ECM off your hands

Our pulling truck is LLY, and I will probably put a s366 or s400 remote mounted Turbo Duramax in my '65 Malibu SS, so I have plenty of use for the current ECM, it definitely isn't junk.