Quote:
Originally Posted by BlackasCoal
ABS I’ve been chasing wires with the service manual to make sure when I gutted the harnesses I didn’t switch a wire in a plug somewhere. Could also be from me welding a truss on the rear axle. Heat may have messed with the sensor. Though I do still have a speedo.
The map sensor also show 5psi of boost just sitting not running. Swapped sensors from a known good truck and the same. So not sure of that either.
Just a bunch of pain in the behind gremlins to chase down. |
Speedo will work off abs and/or trans output sensor. Just a though but the ABS module needs the VIN to be programed and matched to the ECM. The ECM you are running now may have a VIN mismatch and be causing your ABS. You did not post any ABS codes but your comment on changing ECM made me think of this. All the modules on these truck look for VIN to match for communication.
On the boost senor. You should be at 1 atmosphere or 14.7 psi give a few tenths with the engine idling. Check the 5V reference to the sensor. On the older trucks.... 06 to give an example. The 5V reference from the ECM is for
MAP, Air Temp, Crank and Cam senor, and rail pressure. Make sure all the other sensors are good. You can also check the return voltage from the
map sensor. Last but not least is to check your grounds. I have found many weird ground issues with these trucks over the years. I have fixed a few by going straight to ground and bypassing the ECM when needed.
BTW..... Nice clean build. Love the effort you have put in. It is all about the details!