Fuel Pressure input

[Beer99C5]

Well basic monitoring of the V did not pan out to well...

Grey wire 12 V switched
Black Ground
Purple output...

Showing 1.45-1.47 Volts (at the sensor and in EFI at the EXT.AD2) which equates to 24-26 PSI...expecting to see 2.8 V + or -
Mechanical gauge shows 60 PSI on the same T.

No sense in trying to add it to the PIDs if the math is not working out...

[TAQuickness]

LOL ok I have it all in...what do I do now?
Am I on the right track with changing one of the wideband's file to reflect the above Voltage/pressures?

V 0.5 4.5 .1 "{EXT.AD2}"
PSI 0.0 100.0 .1 "{EXT.AD2}"
*CLC-00-951

Not sure what this does...

factor 0.0 2.0 .1

TA hit me up on Yahoo mess.if ya can

I would just create a new PID in the user file. If you modify one of the PID's in the SAEGeneric file, it will be overwritten with software updates.

Have you tried hooking the sender directly to the end of the rail? Perhaps the sender is not getting a true reading.

[Beer99C5]

Relocated at the fuel rail and still 1.4 V...which is 1/2 the 2.8 I am looking for...I am wondering if the gauge (which I do not have does something like multiply the output say by x 2 when its connected?).

Have a email into tech support, don't expect an answer til Monday.

[Beer99C5]

Here is what I got from Tech support...
So the gauge does step the voltage down...
So How do I find a 5 Volt power source everything is 12 volt on the car?

Hmmm maybe the ETC???

From Tech Support

No the wiring is not correct you should have a +5 volt power source to
the gray wire and signal and ground are right. I think the higher input
voltage is affecting the output voltage.

[TAQuickness]

all you need is a resistor to drop your voltage. Might also check your EGR wiring for a 5vdc source.

edit:
I don't have my resistor calculations handy, but it truely is a cheap fix.

[TAQuickness]

If my figuring is correct, you will need a resitor 1.4 times the resistance of the sender.

[emarkay]

Be careful of resistors near fuel - if you don't get the right wattage they can get real hot, and are not always stable for voltage dropping purposes.

Short on time here, but are you trying to drop DC voltage (say 14VDC to 5VDC?)

Those 78xx / 79xx voltage regulators are the niftyest things for this, are less than a dollar, and are good for an amp if heatsinked!

http://www.fairchildsemi.com/pf/LM/LM7809.html

I use a one to get 9VDC for my MP3 player.

[TAQuickness]

thanks mark

[ringram]

5v goes down the stock NB02 wires... maybe you can splice into that on one side. Its a switched source. Trace it back nearer the source and off you go.

[TAQuickness]

ringram - which wires? I've measured 12vdc across the heaters and 0-1 with the NB hooked up. Looking at the schematic, and I don't see where 5vdc would come into play. Help!