GAUGE SHOWS VOLTS, NOT LINEAR READING AS EXPECTED

[seangh]

Hi - first post here - trying to get a Fuel Pressure Gauge set up in TS - having some issues =

I have a AEM 100 PSI transducer set up as a fuel pressure sensor. Running a MS PNPPRO for 01-05 Miata. In TS I set the sensor up as generic sensor 1. I set p the gauge as linear with these settings:


I set up the gauge on the TS dash, select generic sensor 01, under properties, select output channel as sensor01:



So here is what I get (-8.2) - it looks like I am getting VOLTS? and not a linear transformation as I would expect. My Actual fuel pressure showing on my FPR gauge is 50 PSI.


If I switch to RAW this is what I get:


So it looks like TS is not performing the linear transformation for some reason - any ideas? I've searched and searched and haven't found any solutions. I suspect I may have to edit an ".INI" file but have no clue how to do that and have not found any solutions specific to MSPNPPRO - supposedly this should all be doable via TS. Thoughts?

[LT401Vette]

That linear translation is actually being done by the firmware.

What version firmware do you have?

[racingmini_mtl]

The transformation is correct if you only get 36 as the raw value. You only have 36 ADC counts out of 1023 so it only sees about 0.176 volt. Check the voltage from your sensor and check your wiring.

Jean

[LT401Vette]

The transformation is correct if you only get 36 as the raw value. You only have 36 ADC counts out of 1023 so it only sees about 0.176 volt. Check the voltage from your sensor and check your wiring.

Jean

Good point... I didn't pay attention.

[seangh]

The transformation is correct if you only get 36 as the raw value. You only have 36 ADC counts out of 1023 so it only sees about 0.176 volt. Check the voltage from your sensor and check your wiring.

Jean

OK - roger that. Will (re)check wiring tonight and check back. For the record, I have :
TunerStudio MS 2.6.14 - EFI Analytics, Inc.
versionInfo fileFormat="4.0" firmwareInfo="MS3 1.3.2 release"

Thanks

[seangh]

Quick update: Sender seems to work. I am reading just shy of 3V from the output signal wire, which, according AEM would correlate to 55 PSI or so, which is what my inline FPR dial gauge shows give or take a pound.


Next thing is to check the signal wire back to the MSPNPPRO and make sure it's continuous and that it is going to the correct pin in the auxiliary connector. I haven't done it yet since it's so late and kind of a PIA to pull the MS out from under the dash.

A couple interesting things:

1) with sensor connected and not connected, the TS fuel gauge still shows 36 with RAW setting, not sure what that means other than the wiring is messed up to the MS somehow.

2) Likely not related, but when shutting down TS, I get a broken dialogue box, asking if I want to save my dashboard but can't since there are no buttons and TS hangs, and I have to force quit.


running OSX Yosemite

[seangh]

So checked all my wiring. Every thing seems to be in order. I'm getting about 3v back from the AEM sender, checked the voltage at the auxiliary pin connector where the output signal from the sender connects in the back of the MSPNPPRO and it reads 3V on my meter.

So I'm stumped. The default function for "ANALOG INPUT 1" is "MAF", don't have a MAF and I'm not getting any conflict warnings from TS when I select this input for generic sensor01. Any ideas anyone? I'm still thinking I have to edit something in some INI file - but have no idea...

[LT401Vette]

Have you measured the actual voltage to see if it is really providing the expected voltage?

[seangh]

Have you measured the actual voltage to see if it is really providing the expected voltage?

I've measured the voltage coming out of the sender at nearly 3v (don't have a digital meter) which would correspond to 55 - 60 psi which is what I am expecting. I confirmed that voltage at the back of the ms as I described above.

[seangh]

Lot's of looking and reading posts.
Still stumped.

Thinking maybe I need a firmware update - is there one? I don't see any here - http://mspnp.com/ and not sure if the other MS3 versions are compatible...