#49220, "RE: Where is our ECU ground?" In response to Reply # 0
the battery ground is pin 10 (top harness) black wire BUT you want a chassis ground not the battery ground and there is NO chassis ground directly on the ECU, I would recommend just removing one of the torx screws that holds the black cover on the ECU and sanding it to get a good clean spot to land the cable on and install it there.
OUR ECU's DONT HAVE A CHASSIS GROUND WIRE (they are just tied to the metal on the car but there is no dedicated ECU chassis ground wire, so your adding one
#49227, "RE: Where is our ECU ground?" In response to Reply # 2
Mine too.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)