Tricked-Out-Toy

Is the AC line Pressure connection OBD1 and ODB2 pcms different? I have a 97 (obd2) wiring and converted a ODB1 PCM to work. I taped into the line pressure with the 0-5v output from my WB02 and im not getting any reading in datamaster.

FASTFATBOY

I am about to do this with an LC1, THANKS.

Can you still save and e mail the datalog with this feature enabled? Does it save all of it in the e mail?

David

tireburnin

I can't get this to work either. It appears differently in datamaster for me.

I programmed as listed and "0.058980" results in an output of 7.34-7.36 in my "custom engine data display menu." In your pictures this value field shows as 12.25. The window in datamaster varies between 13.1 and 15.1. It doesn't transistion it just shows either of those two numbers.

Any ideas or possible input? It appears as though the output isn't multiplying by the correct gain.


EDIT *** Never mind I'm an idiot. Make sure your brow output wire is connected. Works great for me.

jchevy

How did you guys get this to work. I am coming from the brown wire of my LC-1 and I am getting the correct voltage between 0 and 5 with my multimeter. I unplugged the a/c pressure sensor and stuck the wire in the connector spot for the red/blk wire. I reconfigured my data master but i read -15.o or -13.1 like its and open circuit. Do I need to ground out some pins on the connector or something. I have my LC-1 grounded. I am using a 95 PCM in my 97 car, but I read an a/c pressure when its plugged in so it seems like it should be working ok. Any help?

jchevy

for anyone else as clueless as me.....

The A/f Doesnt display in the a/c pressure spot on the main data screen. It displays in that little custom engine data box that pops up.

And make sure your grounds are good

tireburnin

My problem was a bad LC1 controller. I double checked my grounds and it worked great.

The custom data screen is where the corrected data shows up.

Double check the output parameters in the LC1 if you are having problems, mine had changed at one point.

TransAm-Z

I am having issues with unsteady readings in Datamaster as well. Is there a special trick to grounding the LM-1? I have the 5 volt output and the ground wired to the a/c sensor input. Should the ground wire be grounded to the frame?

F6

In Victors Data Definition table where it says "Gain" I see he filled in: 5.898086E-02
I can only fill in numbers and not letters or the - sign.
Anyone know why, or can I just stick with the numbers only??

akafred

get rid of the e-02 and just move the decimal place over 2 places to the left

F6

akafred, thanks for the info!!
Since I don't have an Innovate LC-1, I'll have to see if I can get my Zeitronix hooked up correctly. Furthermore I don't know if the default analog output of my Zt-2 is 0V=7.35 AFR and 5V=22.39 AFR. I will check with Zeitronix.

Steve in Seattle

Just as an FYI, OBDII allows the same AC-Pressure input, not sure of the pin number, but it's signal wire (not the black or grey one) coming from the low pressure AC line. I use a OBDII scanner that provides AC Pressure in Volts so there's no need to convert the PSI value... just convert it in Excel after uploading the log data.

Also, for those using a DynoJet Wideband commander, the AFR vs voltage formula is:

AFR = 1.6*(Volts) + 10

Obviously if you have a WBC you can already get a log of AFR vs RPM vs TPS vs MAP (or another analog 0-5v input), but piping it into the PCM allows you to get AFR when a DTC sets or along side timing and knock retard data.

Strangely, it seemed that my fans go into "high" when logging (triggered by high AC pressure) even if the AC switch is off. Just something to look for if you're tuning idle quality in OBDII.

rickreeves1

Do you know of any other sensors that can be used besides AC pressure?

reamo04

I use the DB guage, so it ties up the brown analog wire.

Can i use the yellow one to tap into the AC sensor instead of the brown?

reamo04

anybody?

tireburnin

They should both be outputs, so I don't see a problem with that.