Ls3 MAP sensor issue

[ztk123]

I have an LS3 376/525 GMPP 216673controller set up, brand new with new sensor and newly built motor. The GMPP harness did not come with the MAP jumper harness, wasn’t available so I bought one from Haltech. Anyway, keep getting codes and engine won’t start unless I unplug the map sensor. Trying to figure out if have the pin locations correct. MAP part number is 55573248 acdelco. I have repointed with no luck…… any advice greatly appreciated! I’ve searched several diagrams but keep getting something wrong.

[blitzer454]

MAP sensor pinout is:

Pin 1 is 5V reference
Pin 2 is GND
Pin 3 is sensor signal

You should be able to find the 5V and ground using a voltmeter when the ignition Key is on to verify the connection. The sensor signal will appear like a floating voltage on the meter.

[ztk123]

Thanks for the info! Switched the pins around but still having some difficulties. Thanks again!