I keep getting P0237

[Ed ke6bnl]

I keep getting P0237 when I rev the engine quickly,  was lucky it did not do it for the Calif. smog check because it passed without throwing the code for him. I read that it is turbo boost sensor A circuit low.  would appreciate some info on this. why and what sensor is reading this. truck seems to run fine and boost will go from 0 to 28 psi. thanks.

[Me78569]

in theory the edge should prevent that code from happening unless it is bad or you have a short between the edge and ecm.

[Mopar1973Man]

Wiring issue, boost fooler issues, possible MAP sensor. Basically having a low volt issue. There is a margin on sensor voltage so if it drips to low or rises to high will trip a code. Boost coolers typical cover just high voltage. Edge comp I know you can unplug the MAP sensor and still not throw a code. 

[dripley]

 I struggled with this code and the engine running greatly defuled. While observing my scan gauge you could see and feel when signal dropped out. I am 99% sure mine is in the wiring harness near the ECM. I was able to grab the harness, move it some and squeezed it. The problem went away. Also had a surging issue that I dealt with in same manner. That issue started again 3 days ago. Performed the same grabbing of the harness and it quit. There is a ground splice in that location for most of the sensors and I believe that is my issue. You might give that a try and see if the code stays away after clearing it

 

[Ed ke6bnl]

I will check the grounds next. 

[Mopar1973Man]

Body grounds are NOT sensor ground. Sensor ground are a floating ground created by the ECM.

[dripley]

The ground wire splice I spoke of are buried in the engine wiring harness. It is not like a ground to the body or such.

Edited May 23, 2018 by dripley

[dripley]

Here are a couple pics of the ground wire splices I am speaking. This first one is of the splice of the ground wires from sensors. This is similar to the ground splices described in @W-T's ground wire mod for the computers and I was thinking it could be the source of my issues. But maybe it's not. 

This second picture is another splice closer to the ECM. If I am reading the 02 wiring diagram correctly this splice is for the 5 volt supply to the MAP and the oil pressure sensor. It is also the area of the wiring harness I have been manipulating.

I did not pay much attention to this one when I opened up my spare wiring harness, it just caught my attention enough to take a picture of it.

 I don't know if either of these splices are your issue but it seems mine lays in there somewhere.

[Ed ke6bnl]

Does the ecm have to remain bolted to the motor or can it be relocated, and if we know where the ground originates from the ecm we can run a new one from there, can't we.  I do not talk from much knowledge of the wiring just of interest in making it better. thanks for informative pictures.

Edited May 24, 2018 by Ed ke6bnl

[dripley]

 I have read in thread or 2 where the ECM was relocated to the fender well. But it seems rare. I know nothing about how they did it nor do I really believe it would make much difference. But I like you cannot speak from any great electrical knowledge. I am a rookie with the electronics on vehicles. I am going to take a better look at that 5v splice when I get home this weekend. The picture asks more questions than it gives answers as to what all is in the splice.