New ScanGauge-D for diesels!
 

How come nobody has mentioned this "newest" SGII™ version for diesels yet?

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ScanGaugeD - Advanced J1939 & J1708 compatible Vehicle Monitor for Diesel Pusher Vehicles : Linear Logic

My diesels are OBD-II.

...but, not ALL diesels are OBDII.

If they actually made a Scangauge that would accurately measure fuel use in diesels, that would be worth something. This example is just a normal Scangauge with a non-OBD-II interface, and it cannot be used on light duty diesels.

Thats what I thought too until I went and took a look at it on their site. It does have some additional functionality for heavy duty applications including exhaust gas temp (EGT), transmission oil temp, engine oil temp, oil pressure, and then all of the other SG standard gauges.

The tricky thing about a diesel is that to get fuel flow accurately, you need to get it directly from the ECM. In gas vehicles, they almost always have either a MAF or a MAP sensor reading that gets broadcast, either of which can do a reasonable job at predicting fuel flow (because gas engine almost all run at a constant air-fuel ratio). The problem that I ran into with my truck is that, while the ECM does have fuel flow information Cummins/Dodge decided not not broadcast this info so that it's available over the ODB connection, hence it's not available to me.

For what I can tell, the product is geared towards larger vehicles (like RV's, semis, etc.) that typically don't have OBDII connections, but rather J1939 & J1708 connections. Looks like they did add some things from the basic Scangauge, but it looks to me like the main change is the communication protocol & the connectors.

The issue still is that you can't read what's not there. If fuel flow isn't broadcast, you won't be able to get it. The same with EGT's or tranny temps.

P.S. I'm still bitter about not being able to read fuel flow over my OBD port.

You think thats bad, GMs newer vehicles like the volt are designed so they can blame the scanguage for causing a check engine light and claim it causes the vehicle to refuse to start.

That's what my Jeep CRD does as well. It uses a *******ized version of CAN that pukes up when any diagnostic tool is connected. The transmission will then refuse to shift.

One word - mpguino. Should solve your problems :)

How? There is no direct way of measuring fuel useage.