Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Range Signal	A	B	C
Park	HI	LOW	HI
Reverse	LOW	LOW	HI
Neutral	HI	LOW	HI
D4	HI	LOW	LOW
D3	HI	HI	LOW
D2	HI	HI	HI
D1	LOW	HI	HI
Illegal	LOW	HI	LOW
Illegal	LOW	LOW	LOW
LOW = 0 volts HI = Ignition voltage