Those purchasing new 3 bar map sensors from AC Delco part numbers 213-1562 or GM 12223861 the sensor is wired internally different than the original TTA 3 bar.
The correction involves swapping the power and ground terminals to it. Whereas old sensor wiring is
A= 5v
B=signal
C=ground
New wiring for 12223861 or 213-1562
A=ground
B=signal
C= 5v
Hope this saves someone from buying the GM harness that reverses the wires for 30 bucks
This only applies to 3 bar map sensor users
The correction involves swapping the power and ground terminals to it. Whereas old sensor wiring is
A= 5v
B=signal
C=ground
New wiring for 12223861 or 213-1562
A=ground
B=signal
C= 5v
Hope this saves someone from buying the GM harness that reverses the wires for 30 bucks
This only applies to 3 bar map sensor users