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Thanks everyone for the help on this, just wanted to provide an update. Hopefully help anyone else with a similar issue. The issue is resolved and it was two things. First, the ground wire was placed outside the CTIS box against the plastic and was not properly grounding. Once the ground wire...

Awesome, very helpful. The unit has no flashing lights and inflates/deflates to the correct pressure for each program. However I have not connected to it to verify any faults. Would you be able to point me in the direction of a wiring diagram to identify those 4 wires?

Interesting, wonder if someone changed the ecu and it’s not playing happy. When I removed it I noticed the ground wire was on the outside of the box, wonder if it was not grounding properly either. Will have to start it up tomorrow and see if that changed anything.

I just removed the box and this is the label on it. Does that look correct for a 2005?

Hello all! Have been lurking on the forums for a bit and recently picked up an 05 1078. So far has been a great truck and limited issues. However since I bought it I have had one issue I cannot seem to sort out. Whenever the CTIS ECU is plugged in I loose oil pressure on the dash and sometimes...