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Can't say I've ever heard of an XZTS harness. I can say that I've never heard of disconnecting something to make it work. P0237 is MAP sensor circuit low. That would indicate a problem with the MAP sensor or the wiring to the MAP sensor.
The MAP sensor is attached to a triangle shaped adapter in the rear passenger side of the engine compartment. It has a three wire connector and a hose that goes to the intake manifold.
What issue are you trying to solve? Other than the code.