Wierd 5v source wire problem on ecm harness isx15 cummins

2013 with cm2250 ecm. We tested the number 30 pin and it has 5V so does the wire leaving that pin. The continuity in that wire is good with a good ohms test up to the egr valve. The volts coming up to that egr valve however is only 3 volts which isn't correct. The codes are:

sensor supply voltage
egr delta pressure
exhaust gas pressure
egr temp
fuel rail pressure
egr valve leakage
dpf fuel pressure voltage
egr system fault

Any ideas or is this common with the isx 15? Where is the grounding locations for this ecm? Sometime in 2013 they switched to the 2350 ecm too. Going to check voltage to those other faulty sensors too and ohm test them.

 

OK so if I take my 5 volt reference and feed it back through the signal wire on my 2013 kenworth isx15 with the 2250 ecm, it should read high reference volts without hurting anything? Will load test the ground tomorrow. Also should the exhaust gas temp sensor and the exhaust gas pressure sensor have resistance between 2 of the spades on each sensor itself to test good? Temp sensor just has 2 while pressure sensor has 3 spades. I have no resistance in both of those sensors and reading online it says I should have at least something. Appreciate the help!

 

4.5 v going to that temp sensor. There was 3v going to the egr, but replaced the gas pressure sensor because it didn't have resistance and then that egr plug power wire went to 5v. All the codes happened at the same time. All the codes now are saying low voltage or short to ground. Dealer plugged it into a code reader and got spn 5609 fmi 4, spn 27 fmi 4, and spn 1209 fmi 4 . Have a readout of what the codes mean. Still says low volts at the egr even though my volts is 5v at the plug. Do you know the resistance value range of the egr? Can I test return voltage out of the egr some how to make sure the plug is making good contact there?. So I did get rid of some of the codes with the new gas pressure sensor, but that new one also had 0 ohms through it.

 

I have a fluke but tested with my oldie and the sensor was still bad. Just my luck. I did blow out the old sensor and got it to read a value. There is another pressure sensor on the egr valve and that did have resistance. So I worked with everything for a while today. The pink number 30 pin 5v reference wire goes up to a red wire on the egr valve plug on the harness. Makes no sense why it wouldnt be pink there too. Every other wire in that egr plug plug tested .7 volts with the key on including the return. Not normal....so went down to the ecm and test each pin that is supposed to feed that plug.
3 .8v
4 .8v
5 .8v
30 5v
41 5v
42 2.5v
47 0v
51 .7v
Those are the eight pins that are supposed to feed that plug. I tested continuity of all the wires in that egr plug to themselves to check for breaks or shorts and the only 2 that were connected was the red 5v reference wire and the return sensor wire. The return wire also had continuity to frame ground. Should that be? The temp sensor was only getting 4.5v. The turbo actuator and speed sensor both had the 2.5 volts and 12v they were supposed too. So I don't understand why I would have .7 volts to all the egr plug wires except the 5v reference. There was also continuity in each separate wire off the ecm pin heading to each separate wire in the egr plug so nothing appears broke but I didn't load test each one. Short some where causing the .7v at the egr plug wire? I need to find out what volts are supposed to be on those ecm pins. This electrical stufff tests a guy's patience!