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3-plug ECM question (2020) Basically a 'yes' or 'no'

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Old 06-03-2023, 10:45 PM
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wharfcreek
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Default 3-plug ECM question (2020) Basically a 'yes' or 'no'

Looking at the wiring diagram for my bike (2020 FLHX), and specifically the TGS connections back to the ECM, I've noted that there are two separate 5V supply feeds FROM the ECM, and two separate 5V GROUND connection points back TO the ECM. One set of Power and Ground leads (for TGS1) comes from the ECM off the GRAY connector plug (pins 9 and 7). The other set of Power and Ground leads come off the ECM at the Brown connector, for TGS2 (pins 18 and 17) Both Sensor leads for TGS1 and TGS2 connect into the Brown ECM cavity (pins 13 and 14) So, distinct difference in connection points EXTERNALLY to the ECM for both the 5V 'supply' connections as well as the two Ground connections. My question is this:

Does anyone know the inner workings of the ECM well enough to say with 100% accuracy that the two grounds and two 5V supply leads are 'common' and connected internally within the ECM? Yes or No?

Because they two 'grounds' come out of two different cavities within the ECM, as do the two 5V supply leads, my concern is that there is possibly some 'affect' on this circuit that possibly having the Supply1 and Supply2 'crossed' with Ground 1 and Ground 2 might have an adverse effect on ECM performance! With CAN-BUS circuitry, you just never know........ So, I'm curious about this, particularly as related to my TGS Throttle Grip Sensor and the two Hall Effect controls within that unit.

Thanks for any help!

Tom D.
 
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