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Muggus
10-18-2005, 01:43 PM
I was coming home from work last night and my CE light kept coming on for a little while and going away. I checked it today and it had error code 25 stored(barometric sensor). Through what does the car sense that? Car is running a vpc.
talondsm18g
10-18-2005, 04:33 PM
MAS but if you dont have it which you dont it has something to do with the vpc
MikeL
10-18-2005, 07:16 PM
VPC should clamp the signal and it should be a value that doesn't upset the stock ecu, maybe it's a wiring problem.
atc250r
10-18-2005, 07:41 PM
I'd say it pretty much HAS to be in the VPC ECU harness. There is a shit load of wires there, they are squashed into a little area, and they're getting old so things are bound to go wrong. That's the main reason I don't run a VPC harness (also the 1G harness is no longer available) in my car. If you get an ECU chip from DSMChips.com chip designed for use with the VPC it will clamp the baro, iat, etc.... in the chip. All you'll need to do is provide the VPC with basically the same connections as an SAFC needs. You can also remove the harness and solder in some resistors to trick the ECU into seeing these sensors but that's a little ghetto to. With the DSMChip you'll also get all the other features (including injector compensation) they come with.

John
Muggus
10-18-2005, 11:26 PM
Yeah i thought it was built into the maf which is why i was like wtf. How could i get that signal with the vpc stopping the signal but like you said it could be a wiring problem. Ill check all the wires thursday and see if anything looks wrong.
atc250r
10-19-2005, 08:25 AM
The VPC doesn't stop that signal. Since the sensor is gone (it's inside the MAF) the VPC harness uses resistors to lower a voltage to a good baro reading and thats what your ECU sees. If the connector, wires, or resisitors get screwy it will no longer give the ECU a good baro reading and the ECU will throw a code.

John
Muggus
10-19-2005, 12:08 PM
Ohh ok thanks, so i need to find the pinout for a barometric sensor and check that wire then right? Anyone know which wire would cause this error.
atc250r
10-19-2005, 10:38 PM
Yeah, find which wires on the stock harness come from the baro sensor and then follow them in the VPC harness. There is a how-to on the VPC Yahoo Group that shows what resistors to use if you're not running the VPC harness. That will help you repair it probably. Also, I believe it is two resistors set up as a voltage divider to get the voltage the ECU wants to see.

John