Analog sensor Ref voltage

[tpepmeie]

Is the Syvecs/Life Reference voltage output regulated to exactly 5v, or is it 5.1+ like on some GM ECU's? Doing some math on sensor linearizations and this is a variable.
Thanks,
todd

[TimH]

Just measured an S6 here at it's 5.03V so I would say 5V ±a few % tolerance for the regulator

[tpepmeie]

I measured at the AN Ref pin on my Life F88, and got 5.28 ish. I realize there may be some voltage drop after that due to the harness, etc. Thought maybe the guys from Syvecs could tell us exactly what the regulator is set to provide for AN Ref.

[stevieturbo]

I've never measured it...but I do notice on some sensor readings, for the first 30s or so after startup, they're a little off

Even stranger my ECT seems to track MAP to a small degree under load, rising and falling as it does. lol

Havent had a chance to investigate why. No doubt it's my wiring !

[tpepmeie]

ttt

Ryan or Pat,
Does the internal value of VREF impact the sensor linearization tables? I'm measuring more than 5v on the reference pin, so should I make the linearization match that value at max?
Or am I overthinking this? I have GM sensor linearization curves, trying to convert to Syvecs/LR tables.
Thanks.

[stevieturbo]

I've never measured it...but I do notice on some sensor readings, for the first 30s or so after startup, they're a little off

Even stranger my ECT seems to track MAP to a small degree under load, rising and falling as it does. lol

Havent had a chance to investigate why. No doubt it's my wiring !

As an update to my last comment there. I did test MAP sensor with temp etc all plugged in. And they do remain rock solid at all MAP readings, so any rises etc were clearly correct ( Although never did investigate the first 30s readings )