How do you all scope signals? Splice into the wire, or probe a connector? I am having a hell of a time getting my speedometer to read, which is effecting the shifting. I?ve rang all the wires out from the vss, and trans connector to the tcm. I?ve also tried multiple sensors. Speedo only shows half speed, and won?t go any higher than 25. What I see in HPtuners matches what the Speedo shows. I?m very desperate, any help would be greatly appreciated.
What is your vehicle config?
If you're getting any speed signal at all, it's likely the wiring is OK. You could have an issue with the sensor or with the speedo config. You should upload your tune and a log.
If you want to scope the speed signal you'll need some sort of scope. At a minimum, you may be able to use a normal AC multimeter to measure AC voltage between the VSS wires. I have used a cheap Aliexpress oscilloscope for looking at various signals, including VSS.
PXL_20210630_162420894.jpg
1972 Triumph Spitfire Ecotec Swap:
Stage 1: MEFI-4B & L61 - deceased; ate it's own balance shafts - because I did a dumb.
Stage 2: E37 & GenII L61 - Ran great, but too meh.
Stage 3: An LSJ is a good time in a 2000# car.
2005 GMC Canyon base work truck.
LS Swap, AR5 Trans, BCM transplant, Sierra Dash, G80
The vehicle and hardware is
07 trailblazer ss awd
4l80e converted with bw-4485 t case from Escalade.
E67 ecm
T42 tcm
4l60 to 80 adapter harness from pcmofnc
Ecm and tcm both from pmcofnc set up for my truck and trans.
I have a scope, I’ve never used it before but it was too good of a buy to pass up. I might have a log, I’ll report back when I can.
Thwnks for the reply.
Is the temperature data accurate? Like, you're running at 235F+?Originally Posted by Tonyorlo
1972 Triumph Spitfire Ecotec Swap:
Stage 1: MEFI-4B & L61 - deceased; ate it's own balance shafts - because I did a dumb.
Stage 2: E37 & GenII L61 - Ran great, but too meh.
Stage 3: An LSJ is a good time in a 2000# car.
2005 GMC Canyon base work truck.
LS Swap, AR5 Trans, BCM transplant, Sierra Dash, G80
It was at that moment. The e fans weren’t kicking on, helps to have the ground landed. That was the first drive after swapping the trans.
pcmofnc tune.hpt
the tune
This isn't our tune. this is just what is needed to get the 4l80 going.
Is the wiring all stock? The wiring for VSS are normally a twisted pair to cancel noise.
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