ZR-1 Net Registry Forums - View Single Post - Needing Help with Throttle Position Switch (TPS) on 1993

VetteMed · 03-15-2012

On a 91, and possibly other years, the wire colors are Dark Blue and Black. Black is ground, Dark blue is the voltage the ECM is seeing. The third wire should be the 5V reference signal (Gray, I think).

03-15-2012	#5
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,816	Re: Needing help with TP Switch On a 91, and possibly other years, the wire colors are Dark Blue and Black. Black is ground, Dark blue is the voltage the ECM is seeing. The third wire should be the 5V reference signal (Gray, I think).