IAT Sensor Location

[RHinds]

I've read many threads and posts concerning the IAT sensor getting dirty and providing bad readings to the ECM causing poor performance and loss of fuel economy.



My question is, has anyone removed the IAT sensor and moved it to a new location where it won't get dirty and also read a lower temp. than in the intake manifold itself where it is reading the temp. of the air that has been heated by the engine?



There are many gassers moving it to the air box and noticing significant improvements in their performanc and fuel economy, and I was just wondering if this would be of benefit to the CTD as well?



Thank you all for any information and thoughts.



RHinds

 

[Vaughn MacKenzie]

RHinds I'm happy to report it's been relocated to the air filter area, where it belongs! Vaughn

 

[RHinds]

Have you noticed an improvement in performance, or any negative side effects? I'm curious, getting it out of the intake should remove the possibility of it getting sooted up and providing bad readings to the ECM.



Thanks for the response.

 

[rbattelle]

The IAT sensor comes from the factory positioned just downstream of the air box exit. I cannot imagine it getting sooty in that location.



And to be honest, I can't recall ever reading anyone on here mention that their IAT sensor was dirty, causing poor running. It's measuring temperature, what difference does it make if it's got 0. 0001" of dirt on it?



And I thought the only function of the IAT sensor was to tell the computer whether to cycle the heater grids and/or go to high idle? Are you thinking of a MAF sensor (which we don't have)?

 

[RHinds]

If I'm not mistaken, the MAF sensor is the one just outside of the air box, and the IAT sensor is towards the rear of the engine on the left side, somewhat close to the MAP sensor.



There have been several threads about dirty IAT sensors, one specifically that I recall having posts from Marco and discussing the readings from the IAT being incorrect due to contamination. Unfortunately I cannot locate that post.



Here is a new post

https://www.turbodieselregister.com/forums/showthread.php?threadid=79835&highlight=iat



This one states that the IAT and MAP are combined into one now.

 

[boonsur]

The dirty IAT problems were with the 2nd gen's. (and only a few people actually found an issue with their sensor). You shouldn't have to worry on your new truck.

 

[Vaughn MacKenzie]

Sensor Trivia

RHinds I got your PM



Just so there is no confusion. . .



• The MAP (Manifold Air Pressure) is mounted on the intake manifold plate on the driver’s side of the engine

• The IAT (Intake Air Temp) Sensor is mounted in the airbox inlet and reads temps between the airbox and turbo.

• The MAF (Mass Air Flow) sensor does not exist. Cummins has never utilized a MAF on any version of the 5. 9 diesel, at least in the Dodge application.



I hope I'm not insulting anyone's intelligence, just want to make sure it's clear to everyone so we're all educated about our Cummins



Vaughn

 

[SRadke]

I looked at the cutaway of the Cummins that Dodge uses for advertising last week. It appears to have some kind of sensor in the compressor housing of the turbo. Any idea what this was? I'm 99% certain this was an 03-04 engine and not a 600.



-Scott

 

[SRadke]

Bighammer was kind enough to take pictures of this thing when he saw it at the Detroit Auto Show. Unfortuantely they are too big for a small minded person like me to post so I'll just give you a link to what I'm talking about. I don't know if this is the same engine I saw but the sensor looks the same and like I said, I'm 99% sure the one I was looking at was not a 600. Here's the link:



http://community. webshots.com/photo/111681305/111681459JZyzFm



-Scott

 

[RHinds]

Thanks Vaughn, with your information, I finally found both sensors, in the service manual. Sometimes finding what your looking for is kind of difficult in that thing, not to mention that they may not be called what you think that they might be called.



Thanks for the help.

 

[Vaughn MacKenzie]

You're welcome RHinds



SRadke why are you sure that's not the '04 600? My 03 does not have the turbo sensor neither has any other '03 I've seen. I'm pretty sure those are the 600 since I saw comments the 600 has a turbo RPM sensor.



Vaughn

 

[SRadke]

The first thing I noticed was the air activated wastegate. I thought teh 04. 5's were suppose to be electronic? When I asked the guy there about it he said "yep they (DC) haven't given me a 600 yet". I realize you can't take everyone for thir word but with the lack of a data plate on that engine I'm kinda shooting from the hip.



-Scott

 

[Vaughn MacKenzie]

Well who knows, you're right the wastegate is supposed to be electronically controlled from what I heard too. Maybe that's a mixed up motor LOL. Doesn't make sense to me if a new engine model is coming out why display the old model?



Anyone who has gotten infinitely familiar with their 600 want to comment?



Vaughn

 

[rbattelle]

That sensor looks to me like a thermocouple.

 

[Bob4x4]

What you guys are referring to in the compressor housing is the electronic waste gate control. It controls the boost signal sent to the old style actuator. I haven't had a chance to play with one too much yet. .



Bob

 

[rbattelle]

Originally posted by Bob4x4

What you guys are referring to in the compressor housing is the electronic waste gate control. It controls the boost signal sent to the old style actuator. I haven't had a chance to play with one too much yet. .



Bob

I stand corrected.

 

[Bob4x4]

Both sensors are dual function,they measure temp. and pressure,pre boost and post boost locations.



Bob

 

[SRadke]

These things are getting waaaay to complicated.



-Scott