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Thread: Ls3 MAP sensor issue
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03-29-2025 #1
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- Apr 2019
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- Louisville, Kentucky
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Ls3 MAP sensor issue
I have an LS3 376/525 GMPP
controller 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.
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03-29-2025 #2
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- Nov 2011
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- Wylie, Texas
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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.
03-29-2025 #3
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- Apr 2019
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- Louisville, Kentucky
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Thanks for the info! Switched the pins around but still having some difficulties. Thanks again!
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