Omni4Bar Sensor stuck at -28.9 inHg

[Boomdeeze]

After putting my car back together I noticed the Omni4bar sensor is stuck at -28.9 inHg and the car will not start. Everything is the same from when the car was running except this sensor. I have checked in link and the sensor is set up correctly.

I ordered a new sensor and it reads the same. The sensor is getting 4.9v. I have the plug and play harness from ECMLink. I thought maybe the ground but the white wire in the harness does not go all the way to the MAF plug so how do you check? I also found that when the positive has 4.9v supplied to it, the sensor signal and the ground both have 4.9v, is this correct?

I put the spare plug in to the sensor and attached the wires in to the plug and play plug from ECMLink but left the ground hanging. The sensor did start to read but would bounce around and actually go positive 3-5psi. As soon as I would take of that spare plug and connect the plug and play harness to the sensor, it now reads -22 to -23 inHg. What is going on here?

I also checked the ECU which looks great and does give off any odors. Looking for any insight on this and I attached a log below.

 

[dsmpat95]

What I know the map sensor increases voltage with more pressure to the signal wire. Check all your grounds to the engine and check ecmlink again for proper setup for your omni4bar.

 

[usmcjay]

I had a similar problem. Don't know what caused it but I know I how I fixed it. Go to misc tab I think and make sure the pin assignments are correct. Once that's done, right below that u need to make sure u tell the ecu where to look for the mdp source whether it be the stock location or Baro etc etc.

 

[rrussell]

I would make sure your plug and play harness pins are in good shape. I spent a day chasing sorta the same deal and found out my black wire on the plug and play was not crimped very well and the connection was crap.
http://www.dsmtuners.com/threads/91-awd-black-cherry-talon-turbo-compound.490729/

 

[Boomdeeze]

I have checked many times for proper setup in ecmlink which it is. The sensor is through the baro right now with the plug and play harness. My pin assignments are set correctly but will check it again.

I think I am going to wire the sensor in to the MDP wires to see if it will read correctly. This was I won't cut up the plug and play harness and it will also use a different input to the ecu.

Thanks for the help guys!

 

[Boomdeeze]

Well the problem is fixed! I rewired the Omni4Bar in to the MDP ecu input and read -1.5 inHg when I turned the car on! I entered my altitude in to the adjustment and got it to 0. The car now runs! Only thing is that now I have light smoke and I am going to say it is from cylinder 1 because of the compression results before I started it, 175-180-175-150. Even though 150 is good I still think that is where the small leak is going in... More tests to be done in that!

Thanks for all the help guys!