Turbo Boost Control Slow response and #5 Injector Circuit/OPEN

John Mechanic California Posted   Latest  
Discussion
Driveability
2016 Nissan Titan XD SV 5.0L (B CEV8D1) 7-spd (RE7R01B) — 1N6BA1F43GN514683
P0205 — Cylinder 5 Injector "A" Circuit
P226C — Turbocharger Boost Control "A" Slow Response
P2BAC — NOx Exceedence - Deactivation of EGR
P1484
P246F — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 4
Hard Knock
Low Boost
Lack of Power

Vehicle came into the shop 2 months ago with same issues. 2016 Nissan 5.0 Diesel. Customer stated that he had the injector replaced by Nissan 1 year and 2 days prior and Nissan would not cover under warranty. Checked wiring harness for injector to see if anything was out of range, no issues found. Check Turbo wastegate actuator and found to be built up and sluggish. Replaced wastegate actuator and #5 Injector, truck left with no problems. Customer called 1 week ago and said he was having the same issues with the turbo, and then came in today on a tow truck with both turbo and injector issue again. We have been through the harness again and find no issues per Nissan Diag Procedure and we are at a loss as to what to do next. Any help would be appreciated. We are thinking the other codes are probably related to these two issues. 

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Marvin Mechanic
Mississippi
Marvin
 

Injector on different cylinder too id bet,cp4 pump crapping out like fords and duramax..injector stuck open?

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Marvin Mechanic
Mississippi
Marvin
 

You didnt say problem was on same injector did you?

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John Mechanic
California
John
   

Problem has always been #5 injector - swapped injectors, cleared codes and it runs fine. Will be taking it back out for a test drive.

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Marvin Mechanic
Mississippi
Marvin
 

Are the other codes exhaust temp related ,as extra fuel in exhaust could gum up vanes,or sliding ring,,,and cause high temps or are they electrical codes ? It is veru very rare for bosch injectors to fail..we are a fuel injection shop…very rare

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Marvin Mechanic
Mississippi
Marvin
 

Did you ever fix the truck

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John Mechanic
California
John
 

We fixed the injector issue - found continuity issues with the wiring harness and replaced that, also hoping that it would fix the turbo low boost issue, but it did not. Taking it to Nissan to diagnose, but will keep this thread open until we get a response from them.

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Tony Owner/Technician
Missouri
Tony
 

If you were to only clear codes then drive it, how long would it take for P0205 to return?

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John Mechanic
California
John
 

Testing that today

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Justin Technician
California
Justin
 

I will start by stating this engine was supposed to be in the Ram instead of ecodiesel and I enjoy Cummins for there reliable products and ease to work on but manufactures that buy outsourced power plants typically don’t buy the full training packages so finding an experienced 5.0 diesel tech may be very tough or impossible . That being said I always start of with freeze frame data and if unable…

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Justin Educator
California
Justin
 

I’ve never worked on that Diesel engine but I’m pretty familiar with Cummins. I would think that the injector problem could be related to the low boost issue. If you scope the power side of the injector and scope The current you can verify that the other injectors are working properly. Cummins captures inductive kicks from other injectors when they are fired and uses it to fire the next injector…

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John Mechanic
California
John
   

Swapped injectors, cleared codes, starts and runs fine. Left it overnight and will check temp sensors before starting and test driving this morning. Check all temp sensors - all temp sensors are at 70 degrees except EGR Temp Sensor - which is at 50 degrees.

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Kyle Mechanic
Illinois
Kyle
 

Why was truck towed in? For injector issue or turbo issue? How long will truck run and drive before problems occur again? You also have codes for multiple EGT sensors which indicate circuit faults with the sensors or the sensors themselves. I would view freeze frame data for those sensors and see what the discrepancy is. The only code that would be a result of the other codes is the NOx high…

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John Mechanic
California
John
 

So the truck was towed in once the injector code came up. Customer indicated that the turbo issue came back only a few days after replacing the wastegate actuator, but he could pull over, let it sit for about 5 minutes and then the truck would run fine for the rest of the day. When the injector started misfiring the display indicate that he needed to pull over as the engine was shutting down. At…

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Kyle Mechanic
Illinois
Kyle
 

Judging by the fact that that injector has been replaced a few times I would surmise it has a problem with the harness itself or a terminal. On other common rail diesels it is fairly common to have an issue with the injector pigtail itself. Since the injectors operate at such high voltage I would start with a new pigtail and verify the pins in the FICM and or ECM are okay. As for the turbo I…

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John Mechanic
California
John
 

SO we swapped the injector with one of the others and cleared the codes. Also replaced the EGR Temp Sensor as it was reading 20 degrees below the others this morning when we came in. Took the truck for a test drive and Turbo Boost and NOX codes came back - almost killing the engine. Let it sit and idle for about 5 minutes for temps to come up and runs like a champ although the same 2 codes came…

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Justin Technician
California
Justin
   

Is there a way to grab freeze frame ? can you perform turbo hysteresis test and actuator calibration tests as per trouble chart for turbo codes ?

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John Mechanic
California
John
 

Passed the Hysteresis test and calibration. Found no continuity in EGR Temp Sensor ground, but all other temp sensor are fine. All use the same ground to ECM so trying to find where the connection is broken.

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John Mechanic
California
John
 

Passed the Hysteresis test and calibration. Found no continuity in EGR Temp Sensor ground, but all other temp sensor are fine. All use the same ground to ECM so trying to find where the connection is broken.

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