Prius C Panel Displays to ODB event mapping

Has anyone actually gotten around to mapping the various status displays the Prius C has on the dash to the various ODBII codes to make similar displays in Torque? If not, would there be an interest in working on mapping these out?

 

Ok, I've imported all of those and will start working on this. Next question: Is there a Prius C specific community wiki yet? If not, I'll build one so there's a place for me to work on this out of. It might be a good place for people to store links to aftermarket parts / project how-tos as well. It would make cross linking and updating a little easier than constant forum searches that can sometimes spit out some misleading results.

 

Meh. Screw it. Made one on Wikia just so I have a place to dump things. Use it, don't use it. Whatever.

Prius C Wiki

 

Ok, just tested a few different ones to see what's working and not working. These are ones that I would consider "critical items", but most other people would probably disagree with me on that. I spent 9 hours (and about 310 miles) doing city driving yesterday to try to shake out some of these gauges. Here's some observations:

Coolant Data @ 2101|7E0 spits out info that mostly makes sense, but the formula leaves me scratching my head. I * 9 / 5 - 40 looks almost like a conversion from Fahrenheit to Celsius, but it looked like it was implemented incorrectly. After a bit of playing around with a calculator to try to break the formula, it turned out to be quite sound. Proof of function: I=10, J=128
I*9/5-40 -- 10*9=90, 90/5=18, 18-40=-22F
(I-40)*9/5+32 -- 10-40=-30, -30*9=-270, -270/5=-54, -54+32=-22F
J*9/5-40 -- 128*9=1152, 1152/5=230.4, 230.4-40=190.4F
(J-40)*9/5+32 -- 128-40=88, 88*9=792, 792/5=158.4, 158.4+32=190.4F

Coolant Data @ 2123|7C0 -- I have NO friggin' clue what's going on here. I either get transported to one of the arctic poles the second I sit in my car, or this formula needs a SERIOUS overhaul. I was routinely seeing negative numbers (-37.8 was todays average, with coolant data @ 2101|7E0 telling me ~158.) and they would flux up and down quite a bit. I'd need more time to research what's going on here. It might be a raw read of the output of the coolant from the ICE, but I can't pay attention to both the road and the tablet for obvious and legal reasons. Also, the US formula here is correct. The /2 from the metric formula gets merged in with the /5 from the F->C conversion to give a *9/10+32. Proof: A=10
SIGNED(A)/2*9/5+32 -- 10/2=5, 5*9=45, 45/5=9, 9+32=41F
SIGNED(A)*9/10+32 -- 10*9=90, 90/10=9, 9+32=41F

MG1RPM @ 2161|7E2 confirmed working and correct.
MG2RPM @ 2162|7E2 confirmed working and correct.
ALL MG1/MG2 temps, including the inverters appear to function as expected. I will test for overload at some point by finding a decent size mountain to drive down in "B".

Regenerative Requested and Regenerative Operation 2148|7B0 -- Works, but only sort of. Caps out at 27.3 using the existing formula. A and C do not appear to spit anything out. B and D might be the only units used for these two units in the "C". I need more data and a LONG underutilized parking lot to test in. Note: This seems to cap at a raw output of 37, if that makes sense to anyone. For binary, this makes ZERO sense, as it wastes an entire bit for the ability to spit out a total only 6 higher than if it used one less bit.

State of Charge (ALL) @ 2101|7E2 -- Incorrect, most likely NOT what this is. Use State of Charge @ 015B|7E2 instead. This was reflecting WEIRD numbers almost the entire time. I spent most of the day's drive at 8.2% varying up to 12%. I've seen this go as high as 90% and as low as 5% when previously used to compare against State of Charge @ 015B|7E2. Not sure what this is supposed to be, but its clearly not a charge state.

State of Charge @ 015B|7E2 -- Functions as intended, matches readings seen on the dash.

Aircon Gate Status @ 2175|7E2 -- Always reflects on, even when A/C is off. Might be a "feature exists" reading instead.

Fuel Input @ 2129|7C0 -- Works, but wasn't what I thought it was at first. This is apparently how much fuel you last added to the vehicle rounded down to the half-liter. The conversion came out to ~7.5 gallons, which was correct for my last fuel up of 7.563 gallons @ $3.58/g

Cruise Operation Status @ 2121|7E2 -- Always on, even when I have cruise control off. Might just be "feature exists" reading like Aircon Gate Status @ 2175|7E2

Fuel System Status @ 2103|7E0 -- This one is interesting. Reads 0 when ICE is off, and 2 when on, but the car is in park. I have not observed this while moving. Most likely correct with what is in the formula. More investigation required.

TORQUE DEFAULT GAUGES-----------
Fuel Level (From Engine ECU) -- Non functional. Reads nothing constantly.
Fuel Remaining (Calculated from vehicle profile) -- Spits numbers out, but not ones that make sense.
Fuel Flow Rates (/m or /h) -- Low. Really Low. Seems to function, but needs tweaking to fit the "C".
RPM Gauge -- Functions, but I can't verify accuracy. Seems to be about right though.

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There was another set of Prius PIDs that I was working with previously. One of them seemed to be a fairly close approximation of the current fuel level. I'll have to find that sheet and see if I can tweak the formula to fit. There were other functions in there as well that might apply. It also seemed to be updated as recent as February/March of 2013. I'll look for it again and post a link.

 

I wonder if its possible to get that to latch to a change in Fuel Input @ 2129|7C0? Might have to go talk to the Torque programmers about that.

 

I have a possible solution:
Mode and PID: 2129
Long Name: Fuel Level
Short Name: Fuel
Minimum: 0
Maximum: 9.5
Scale: 1
Unit: G
Equation: A*0.132085
OBD Header: 7c0

Would someone else please test this in Torque? I'm getting 6.34008 from this, which is about what I'd expect. It steps in half-liter increments, so its not "real time", but it'll give a better read than the bar gauge on the heads-up if its really what I believe it to be.

-Steve

 

I believe its a raw read on the contents of the tank, yes. That's why I need someone else to test it, I just refilled Friday. -_-;

 

Documents I'm working off of:
Welcome to Google Docs
Prius Gen III XGAUGEs.ods - Google Drive

 

Confirmed. Fuel Level @ 2129|7C0 is a raw read on the tank. Tested this by letting my C sit idle over night and got a reading of 5.6 steady. Went and shook the vehicle side to side without ever taking it out of park and watched the value slosh from 4.8 to 6.2 and slowly steady back down to 5.6 over a few minutes. For just turning it on to initialize the ECU and then manually rocking it side to side, I have very few doubts as to what this gauge is now. Next trick is to test it for accuracy.

-Steve

 

Here's my Torque gauge setup.

Gauges.jpg - Google Drive

-Steve