[jdkskyking]

Unit 639 2002 model

Hello, Mike and I need guidance. 

Engine recently started puffing black smoke. 

Tech using diagnostic equipment recommended a new engine computer. 

New computer made smoke worse. 

Now the DDECU4 indicates a Hard Code 53

Any ideas?

Mike is at the shop that sold him the new computer but they don’t have answers. 

Thank you!
JK

[Georgeb]

Check ground

[jdkskyking]

Check ground

Can you expand?

[Fulltiming]

These folks http://www.dieselcontrolservice.com/inde...placement/ say 53 is Nonvolatile memory failure or Nonvolatile memory data is incorrect. Sometimes caused by oil inside the case shorting the memory pins but I wouldn't think that would be the issue with a new unit. Did they flash the new unit with the correct parameters?

Others say if the EEPROM was not properly flashed/did not take the flash, you can get that code. "Flash Code 53 indicates that the ECM was unable to read a valid copy of an engine data record (calibration, faults, or accumulators) stored in nonvolatile memory.Flash Code 53 also indicates that the ECM was unable to update an engine data record (calibration, faults, or accumulators) stored in nonvolatile memory."

[jdkskyking]

These folks http://www.dieselcontrolservice.com/inde...placement/  say 53 is Nonvolatile memory failure or Nonvolatile memory data is incorrect. Sometimes caused by oil inside the case shorting the memory pins but I wouldn't think that would be the issue with a new unit. Did they flash the new unit with the correct parameters?

Others say if the EEPROM was not properly flashed/did not take the flash, you can get that code.  "Flash Code 53 indicates that the ECM was unable to read a valid copy of an engine data record (calibration, faults, or accumulators) stored in nonvolatile memory.Flash Code 53 also indicates that the ECM was unable to update an engine data record (calibration, faults, or accumulators) stored in nonvolatile memory."


The remanufactured ECM supplier tested ECM #2 and then programmed another remanufactured ECM. The original ECM was reinstalled, no change. ECM #3 installed, no change. 

If it’s a injector that would not be shutting off completely and allowing fuel to pass into the cylinder (stuck or dirty) , wouldn’t that cause that cylinder to smoke more? 
We’re hoping to get someone to diagnose again and with a computer shut down each injector individually and look for a noticeable change in black smoke and rough idle. 

---

Has anyone encountered a sudden induction leak with their engines?

[Richard]

So............

Induction leak, or as you have explained your terminology, a CAC leak, would result in a lack of boost. Certainly causing black smoke under load. But the engine would not smoke at idle......

I also think, like George, check the ground supply for the ECM. I saw screen shots of the diagnostics, there was also a low voltage to ECM code.

The coach is in Florida, electrical connections get corroded down here.

I would find the ground point for the ECM and clean it up with DeOxit.

[jdkskyking]

So............

Induction leak, or as you have explained your terminology, a CAC leak, would result in a lack of boost. Certainly causing black smoke under load. But the engine would not smoke at idle......

I also think, like George,  check the ground supply for the ECM. I saw screen shots of the diagnostics, there was also a low voltage to ECM code.

The coach is in Florida, electrical connections get corroded down here.

I would find the ground point for the ECM and clean it up with DeOxit.

It’s going to a Detroit Diesel service center tomorrow for a checkup. Hopefully this will tell us something.