Dodge/Chrylser/Cummins custom PIDs

[Zzed]

I've been toying with the idea of getting a bluetooth OBD-II module to delve deeper into the inner workings of my truck. So far, the truck is stock, so I'd like to get a baseline before making any major changes. I've been lucky enough to have access to a friend's bluetooth OBD-II module and play around with it. What I've found is that the standard PIDs I can see via the free version of the Torque android application are fine, but the really interesting bits (rail pressure, EGT, boost pressure, etc) are all hidden away in custom/extended PIDs that are Dodge/Chrysler/Cummins specific. Sure, you can access them, but without knowing which PIDs are for what parameter and what the conversion formula is, you're shooting in the dark.



I did some searching yesterday for a source for these custom PIDs on the web, and it appears they are more rare than blue lobster (for free, at least). Companies like Scangauge and Edge get them directly from Dodge/Chrysler/Cummins, but it seems like no one is sharing them unless you want to buy those products.



Does anyone have a good source for these custom/extended PIDs? Should I just save my energy and stop looking?



-=Zzed=-

 

[timelessconstructionllc]

Id like to know about this as well.

 

[ENafziger]

There was an extensive thread about the "Torque" android app on CompD a few months ago. The custom gauges are basically whatever formula you want to read the units in. Kindof like, what voltage output from the sensor (maybe 0 - 5 v) corresponds to what pressure output (maybe 0 - 240 kilopascal), assume a linear y=mx+b type equation, and throw in conversion factor for psi, etc.

IIRC, someone had the RP sensor working.

--Eric

 

[AH64ID]

Boost and EGT aren't reported by the ECM. The modules that read boost subtract ambient pressure from manifold pressure. Those that read EGT have a separate sensor.

This is how to read rail pressure on a SGII.

05 Cummins
Fuel Rail Pressure
TXD: 686AF10123
RXF: 044145230000
RXD: 2810
MTH: 001D00C80000
NAM: FRP

06+
Fuel Rail Pressure
TXD: 07DF0123
RXF: 044145230000
RXD: 2810
MTH: 001D00C80000
NAM: FRP

 

[Zzed]

Boost and EGT aren't reported by the ECM. The modules that read boost subtract ambient pressure from manifold pressure.

I found a "turbo boost pressure" item in the list already available in the Torque program. Enabling it, it appears to do SOMETHING. Although without a real gauge, I have no idea if it is accurate. I can say it peaked at 22. 3 psi. So you're saying that's more of a calculated value for boost pressure?



-=Tygh=-

 

[AH64ID]

You have yet to say what year truck you have.

But if it's boost then the module is doing the math I mentioned. . so long as it says 0 at idle, not 14. 7ish.

 

[Zzed]

It's an '06, and yeah, it runs about 0. 1 at idle. It's interesting that there is no built-in temp sensor for EGT, as I would think that might something the ECU might want to know .



-=Zzed=-

 

[AH64ID]

The ECM doesn't really care about EGT's, the tuning won't allow too high of cylinder temps with everything in working order. Seem's odd, but that's the truth of it.