My boost is reading wrong on my commander, this problem just started and has never happened before. It's reading over 2 bar with the car turned onto accessory. This problem just arouse when I got my drivesoft installed and the car will start but immediately turn off. I have a GM 3 bar sensor that was tuned for and the sensor is not disconnected. When I unplug it it still reads the same 2.12 bar. What can be the problem? Any help would be greatly appreciated.

 

LF chassis harness chewed up on the wheel?

 

I haven't checked that yet, but after unplugging the ecu completely, replugging and repositioning the Power FC everything went back to normal. I'm assuming its a short in the harness, luckily I have a new harness on the side that I was going to install with my new setup...I guess I'll just put it on now. I'm going to check the harness in the left wheel well just to be safe. Thanks for the suggestion.

 

np, be sure you don't ignore it as it can lead to a dead PFC.

 

I three bar map sensor can only read 2 bar relative. Most likely you had a loose connection.
Thus the measured voltage was maximized as Mazda does for default safety!