I'd like to use the External Voltage 1 to log Boost. I am using a GM 3 bar map sensor. Anyone have the PID Calc for that map sensor? Thanks in advance for the help.
I'd like to use the External Voltage 1 to log Boost. I am using a GM 3 bar map sensor. Anyone have the PID Calc for that map sensor? Thanks in advance for the help.
If you can tell me the voltage v's pressure characteristics of the sensor, then I can easily create a calculated PID for you. Let me know what info you have.
Is it a linear 0..5V = 0..303kPa?
If so, then the calc pid (in kPa) would be:
{EXT.AD1}*60.6
if the 3-bar is plugged into external A/D plug 1, or
{EXT.AD2}*60.6
If the 3-bar is plugged into external A/D plug 2.
The 60.6 is calcualte as 303/5
If it is not linear, then you may need to "create" a matching non linear function.
Paul
I have my w/b logged into AD2. When I plugged the boost into AD1, I didn't get an accurate reading. Should the W/B be plugged into AD1 and the boost signal into AD2. I figured out the formula, but for some reason its not reading and intepreting it. I have to check my calc PID file.
AD1 and AD2 are the same, you can use either one for either signal.
However, they must have a common ground and the ground *should* be a common ground with pins 4 and 5 of the OBDII connector on your car.
Try logging the raw voltage PIDs: {EXT.AD1} and {EXT.AD2} to see what the voltage signal is that you are getting from the A/D inputs. The maximum range that FlashScan will register is 0 to 4.8 volts.
Paul
The ground that I used for the W/B signal isn't the same as the one used for the 3 bar MAP sensor signal. The way my AEM is setup I had to use the ground from the unit or I got strange voltage readings. I'm not sure if I can use the ground from the OBD II conector with the AEM W/B unit.
The ground on the Flashscan unit is basically tied to pin 4&5 of the OBD-II connector.
It sounds like the AEM unit ground might not be true chassis ground?.
Cheers,
Ross