Man now think I understand it. Ill have to open the PCM plug find the wire that was used and then run the other lead to the EOT sensor. Better yet reun both new lead from PCM to the sensor.

Thanks for all the help.

 

Any suggestions to opening up the. Not sure what its called. big red block that will expose the pin-outs at the PCM?

 

The grounding of all sensors is done though the PCM so there are no variations in ground that will alter the readings. This was done so there can be a different resistance at any ground or bonding cable, or even of the PCM grounding lug itself. None of that matters for the sensors or controls as they all ground back within the PCM though the main harness.

Overall voltage (battery or alternator) is effected by the positive and negative supply cables between the battery, alternator and ground plane, but again that is isolated from the powertrain control circuits.

 

Big red block is a connector.

You're kind of saying you're not familiar with doing any of this, and this can get you into more trouble then you have now during an in-service training program.

 

So could I tap into the wires from behind or let Mike do this delicate operation? Don't want more trouble then I have..

Thanks

 

Either one. When you don't have the right tools to pull the pins, or accidentally re-insert back into the wrong location at the PCM there's a lot of issues that can happen. From this side of the screen I can't tell how good you are, only interpret the words.

You originally said you had a P0198, which is a open circuit. Pete mentioned flipping sensors, not sure if you did that but it's less dangerous then harness surgery.

 

He had 5 volts Vref between the pins at the sensor as I recall and so should not need to do anything to the wires.

Going back to Mike would be the best bet.

 

Drove the truck about 45 minutes. truck ran great for about the first 20 minutes the I notice the EOT showing in the 90's then back up to normal operating temps, then is was matching the ECT and the fan kicked in. This lasted for about 10 minutes. Not drivable issue noticed. The rest of my trip when well. After a couple hours I cam e home without any issues. Im thinking of swapping out the PCM with a salvaged one to see if makes a difference.
Where can I find the part number because I have notice looking around that there are more then one for my model year.

Just a thought.

 

I made a suggestion in post #3. What were your findings?

 

Do things that cost the least money first.
#3 is free and that is even better.

 

No did not swap them out will do that tommorrow.

Thanks for the reminder.

 

Update
Replaced the EOT sensor today. Had a chest cold that wouldn't go away.
Cleaned out EGR while I was under the hood.
We'll see how it runs in the morning.

 

Update
Replaced my EOT sensor with a new one. No change.
Not sure if I mentioned it in my post but My FSS fan would some times turn on while city driving or on initial start up.
Additionally I was told that my PCM may be giving me the issues I am seeing.
Told to try swapping out my PCM with a salvaged unit. Anything from a 2006 to 2007 PCM. (are they all the same). Said if it works he will reprogram it for my truck.
Question: is there any difference between the model/part number I have been seeing on the internet?
I am willing to purchase a used PCM just to fix it.
Any suggestion for my purchase or where?

Thanks

 

Another thing. It may not have anything to to with it but my AE scan tool is having problems connecting (TSB error if memory serves).

 

Any thoughts as to replacing my PCM (salvage unit) to isolate my EOT problem?
The other day again, I just got off the hy-way and looked at the scangauge II and noticed again that my ECT was 188 and the EOT dropped down to 90. No driveability issues when I was driving. and in a couple minutes of city driving it went back up to just under the ECT. It has been cold up hear in Canada.
I have checked the wiring from the EOT sensor. (new OEM sensor) just to make sure. I am almost ready to run the other wire dirrectly from the sensor ro the PCM block plug but was warned about doing so (could posibly cause other issues).

Has anyone ever had this?

Thanks for any help.