AC Pressure KPA to Voltage Range

[Tre-Cool]

Would I be correct to assume that the AC Pressure voltage sent to the ecu is 0v = 0kpa to 5v = 3447kpa?

I'm re-using the ac pressure input for my ethanol sensor and just wondering if this could be the cause of my fans always running when the car is running.

Cheers

[Dannn]

Does your ethanol sensor output a voltage or a frequency/pulsewidth?

Most of the ethanol sensors out there output a variable frequency from 50-150hz for content percentage, and a variable pulsewidth for fuel temperature.

[Tre-Cool]

it's a factory sensor connected to a Zeitronix ECA, so i get 2 x 0-5v wires.

I've wired them up to my EGR & AC sensor pins and using a calculated pid works well, but as the ls1 ecu can turn on/off fan's based on AC pressure I want to prevent anything from messing with my fan control.

I've already done a drag season with it wired up, but i only realized on the weekend after looking at the tune again that perhaps this is why i was always running very cold ect.

I will be playing around with the settings in the tune, but figured the efilive guys could give me a straight answer as to what the factory is expecting. Otherwise I'll just start logging the 0-5v signal and play around.

[Tre-Cool]

looks like i was on the right track by maxing out the values for pressure enable and setting 1 for disable i now have proper control over the fans.

[joecar]

Thanks for posting your results.

Which table id...?

[Tre-Cool]

G0911-G0912 for fan 1. In commodore this isnt used as fan1 is normally controlled by bcm

G0918-G0919 for Fan 2.

I still setup fan1 & fan2 turn on/off temps to the same though.