Will turbo set any codes if not spooling up?

[Ragain]

I have a '08 Ram 5500 w/ 152,000 mi and no fault codes. My turbo seems to lag and makes noise as if being bogged down. I removed turbo and disassembled for inspection.

Slider ring and actuator were clean and operated smoothly. I reassembled and still get periodic turbo noise with low power/economy. Dealer did full system diagnostic and said all engine parameters were functioning within specs. I removed turbo again and this time noticed approx 1/32" radial play on impeller shaft. The impeller tries to stick when turning and applying lateral pressure on shaft.

This can't be a good thing and I'd imagine this explains the noise. If this occurs during spool-up and has been causing low boost, wouldn't the turbo speed sensor and boost sensor see as a fault?

I'm gonna take a gamble and ordered a new turbo which arrives Wednesday 4/21/10.

Any input from you all would be greatly appreciated!

 

[HBarlow]

I know essentially nothing about the problem or solution but I believe you are correct in your belief that the ECM monitors turbo performance and should set a code if the turbo is not spinning up as it should.

Please post when you figure it out so the rest of us can learn from your experience.

 

[sag2]

Not only does it monitor boost pressure, but shaft speed as well. It it can't make the numbers it sets a code. That is the old P2262 everyone was having before the flashes got it under control.

 

[OBayer]

I been the P2262 route already. There's an issue on how it counts the codes, w/o looking it up if I recall correct, it had to code 3 times in a row before the CIL would come on, if it did it twice, and you shut down the count sequence would start again. This went for weeks with mine before the code finally stayed and the CIL came on.
Also, wasn't there a flash that changed the timing on this to allow the turbo more travel time before the code ?

 

[Ragain]

Initially I had 2262 code appear two different times which prompted my first turbo teardown, but then ran another 10,000 mi without any codes at all. Black smoke and soot on exhaust pipe were visual signs of a problem. DPF checked out fine. EGR cooler and valve work fine with minimal soot accumulation. I installed the new turbo today and performance/economy seem to be back to normal. No unusual turbo noise and torque #'s seem to be up considerably at lower RPM's. Economy #'s up also.

I'm just confused why something as major as this would not have any hard data showing signs of a malfunction.