The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

LS short box · 07-01-2022, 08:54 PM

Just FYI on the TCC switch. On the older gen three (24 tooth crank reluctor) LS autos the ECM wants to see a "open" curciut when the brake is pressed.
On the newer gen four LS autos that use two ecm's, one for the trans and one for the engine the ecm needs a 12 volt signal when the brake pedal is pressed.

07-01-2022, 08:54 PM	#23
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,943	Re: NOT so EZ wiring Just FYI on the TCC switch. On the older gen three (24 tooth crank reluctor) LS autos the ECM wants to see a "open" curciut when the brake is pressed. On the newer gen four LS autos that use two ecm's, one for the trans and one for the engine the ecm needs a 12 volt signal when the brake pedal is pressed.