tgui

I'm seeing a value in the screenshot? Am I logging the wrong value? Hmmm

tgui

I'll update this post as I take measurements.

12v verified at pin E on PCM to trans connector.

1-2 solenoid 20ohm, A, OK, clicks with 12v

2-3 solenoid 21ohm, B, OK, clicks with 12v

PCS, pressure control solenoid 4ohm, Force Motor, OK

TCC solenoid 10ohm, OK

Temp sensor 4k ohm, OK

Fast355

I can command all gears manually with HP Tuners on my brothers 1999 Tahoe Blackbox and my 2002 0411 in my Express. It was segment swapped on both Engine and Trans FWIW.

George C....

Without the front vss a 4l80 wont have any gear besides the default 2nd gear

tgui

I have one wired in.

The screenshot has input and output speeds reported. Doesnt that mean the front and rear vss are OK?

George C....

Local dude had similar issue as you and his pin wasnt making good contact...fixed that for his front vss and he now has normal trans

tgui

Its working.

I did a quick test. I pulled the front VSS. I saw 0 RPM in the logs and got a DTC.

ARG!!!

EmmerichLSx

iTrader: (5)

I still want to know if your TCC controls will work. I'm not sure yet what it will tell you but I think you should check. From a dead stop, it "should" only lock your converter and stall your motor when the gear selector is in 2nd.

Atomic

iTrader: (42)

The front sensor is ISS - Input Speed Sensor, the rear one is VSS - Vehicle Speed Sensor. They serve different purposes.

Fast355

Mine shifted just fine without it! Just a bit firm.