Cummins ISX 435 Current Codes

We just did a motor swap on a customers trucks. Reflashed the computer to work with the ZF Freedom transmission behind it. Now we are getting two codes.
PO95 - FMI4
SID 151 - FMI3
Does anybody know where these sensor are located so we can troubleshooting. These things have miles of wire.

 

SID 151 is the turbo temperature sensor (not sure)

PID 95 - fuel filter issue

 

The only think I could find on the SID 151 under some Eaton troubleshooting guide for cummins was some boost solenoid volts high.

Did find a code for the turbo temp sensor as 173 / 0 but we are not getting this code.

151 / 3 - system diagnostic code # 1
I can't find any more information.
The 95 / 4 we can work on by changing the secondary filter, checking lines, and maybe just change out the pump. We have several.

 

This is why going by SAE codes doesn't always work and it pays to use Insite. 151 - 3 is Cummins fault code 2355. This is for the turbo control solenoid that controls air to the VGT turbo. This is the box that is under the air compressor and has an air line going to it and another to the turbo. The code is for an open circuit. Make sure it is plugged in, (electrical connector) then make sure the wiring is ok. If your engine doesn't have this box, you may have used the wrong ECM calibration file.

 

Odd that you brought up that little box under the compressor. My guys asked me what that was. I told him I didn't know. We deal with older trucks here mostly. This stuff is new to our guys. Everything has a wire going to it.
He was working on the P095 last night. He found some leaks under the frame rail he is repairing. Maybe the suction side was sucking a little bit of air. Odd part is these codes will not clear. I could understand if something was unplugged, but nothing found so far.

 

We checked the coolant sensor code - this will never go off until the truck has been running for awhile and warmed up (if that even now). The volts to this sensor is 5.14V. Can anybody verify this is the correct volts. We also checked the line going back and have no signs of a broken wire. We also checked the turbo boost controller and it was plugged in. May check volts on the 3 wires going into the 8 pin socket tomorrow.

 

5.14v should be fine. That box or the wiring may have been faulty before, you never know. I hope the problem is wiring because I think those boxes are around $800 new.

 

exactly. the pid 095 code is NOT a fuel system fault. it is a cummins fault 2374 - exhaust gas pressure sensor. just replace the sensor. these go bad all of the time. be sure that there is no corrosion in the connector as this is also a common problem.

the sid 151 code is cummins fault code 691 (not 2355). this is for your turbo compressor intake temp (temp sensor right on the turbo). fault is for an open circuit or bad ground. just unplug the sensor and measure the voltage across and should range from 4.75-5.25 volts. if it is in range, replace the sensor. if not, check the ground circuit for continuity.

oh by the way, the exhaust gas pressure sensor is located on top of the t-stat housing. easily noticeable by locating the sensing tube coming off of the manifold and going up to the t-stat housing. up there there's two sensors, a three pin sensor (exhaust gas pressure sensor) and a two pin sensor (coolant temp sensor).

 

Update - since we are in the salvage business we have our hands on a lot of parts. The mechanic figured it must have been a harness problem. Changed that and we got the fuel pressure diff code to go away. We have changed out both the inlet turbo sensor and the coolant sensor. We can't get the inlet temp sensor to do anything but stay active. The low coolant sensor on the other hand will go away for 5 minutes and then back. We have tried jumping it and it's a flip of a coin if it will be on or off by the time you walk around the truck and flip the key.
We are about ready to light it on fire and bury it somewhere.

 

what chassis is this in?