TCI Controller 4L80e

UNIsackV6

Member
Can somebody confirm a few things for me on the wiring etc...when you look at the Dashboard of all the sensors it references the MAP Sensor, I don't ever remember having this hooked up before do we need it? Does it matter if the break switch is hooked up? Seems like the truck won't shift into first even though it says it is in 1st on the Dashboard. Thanks.
 

George Blake

DONATING MEMBER
Re: TCI Controller 4L80e

TCI controller(FAST) for the 80e doesn't reference MAP. It uses TPS.
If the vehicle moves, it's in first.
You have to have the brake switch hooked up or the TCC will not behave correctly.
Look in my forum here for instructions on how to hook the TCI unit up in a syty:
http://www.syty.net/forums/showthread.php?t=47450
Other vehicles may vary but the inputs are the same.
 

JSM

Active member
Re: TCI Controller 4L80e

Yep TCI shifts based on TPS and RPM/MPH

PCS can be configured TPS or Map. I think TPS makes more sense though.
 

Daron

Active member
Re: TCI Controller 4L80e

Doesn't the 4L80 default to second gear if the unplugged or otherwise fubared, controller wise? Mine did at least. It would move and drive in 2nd with even the harness completely unplugged.
 
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