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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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 No fuel level reading on Mazda RX-8, speed in hundredths.
Hi!
I just got my Pro Mk3 installed in the car and I have my first time trial event with it this weekend. I'm able to get some OBD PIDs to work, but fuel level shows as 0. If I plug the stock gauges back in (I am planning on replacing them with the tablet), I see a fuel level on the gauge. Any suggestions?
Also, the speed reads to the second decimal place. That's far more accuracy than I need, and I find it a bit distracting. I don't see an option for the display to change that. Again, any advice would be appreciated.
Thank you very much!
Nick
_________________ TT5 Mazda RX-8
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Tue Mar 20, 2018 2:38 am |
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brentp
Site Admin
Joined: 24 Jan 2007
Posts: 5299
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Hi,
It's possible that your car does not report fuel level over OBDII - it's part of the SAE standard, but cars are not required to report support all OBDII PIDs. An alternative is to wire in one of the RaceCapture/Pro analog inputs right into the fuel sender line that comes from the gauges.
The data is natively in that level of precision; one of the features we have coming up is to allow you to specify locally for that gauge how you want it to display.
Thanks,
_________________ Brent Picasso
Founder, Autosport Labs
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Wed Mar 21, 2018 1:50 am |
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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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Hi, Brent,
Thanks for your reply. I'm certainly no OBD/CAN expert, but I'll tell you what I've seen in the past from the RX8's ECU. I have used Harry's Lap Timer and, with an OBDII connection, I have seen my fuel level in that app. Even better, I saw it in real time, so I could see it slosh in the tank. That's handy for avoiding fuel starve.
I don't know how that app logged that data. Was it CAN? Was it OBDII?
I did just try adding the fuel level CAN channel on the RaceCapture app, but that didn't seem to work. When I add that and remove the OBDII fuel level channel, I don't get a fuel level option in the dashboard.
Any advice you can offer would be greatly appreciated.
Thanks,
Nick
_________________ TT5 Mazda RX-8
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Wed Mar 21, 2018 3:05 am |
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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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Okay, I got it to work - largely by bumbling around the interface. Here's what I did:
I looked up the OBDII PID on Wikipedia, and checked to make sure the channel was mapped correctly to it. It was, but then I looked at the matching CAN ID, inside the OBDII channel settings in RaceCapture. It was 2024. When I looked at the CAN ID inside the CAN channel settings for fuel level, it was 0. I set it to 2024 instead, and the fuel level displays correctly.
Woohoo!
_________________ TT5 Mazda RX-8
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Wed Mar 21, 2018 3:15 am |
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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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When I got to the track Saturday, this stopped working. It no longer displays fuel level. Hurgh...
_________________ TT5 Mazda RX-8
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Thu Mar 29, 2018 2:08 am |
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brentp
Site Admin
Joined: 24 Jan 2007
Posts: 5299
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Hi, thanks for the followup. Is it still not showing fuel level, or are you seeing it happen intermittently?
What year is your RX8? Are you using the CAN OBDII cable, or the OBDII legacy adapter?
Thanks,
_________________ Brent Picasso
Founder, Autosport Labs
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Wed Apr 04, 2018 7:12 pm |
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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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The car is a 2004 Mazda RX8. I'm using the Molex connector that came with the Mk3, and I've spliced it to the CAN high/low wires from the car. So all I have connected to the Mk3 is power, ground and CAN high/low.
Since getting the fuel level to work that one time, it doesn't appear to have worked again.
Thanks,
Nick
_________________ TT5 Mazda RX-8
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Wed Apr 04, 2018 7:23 pm |
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brentp
Site Admin
Joined: 24 Jan 2007
Posts: 5299
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Hi,
Thanks for the update. Can you post your configuration so we can check it out?
_________________ Brent Picasso
Founder, Autosport Labs
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Wed Apr 04, 2018 7:36 pm |
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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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I take it that's a config file that can be saved out. I'll take a look when I get home tonight.
Thanks!
_________________ TT5 Mazda RX-8
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Wed Apr 04, 2018 7:38 pm |
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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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Now that I understand that I need to set the PIDs I track to 'passive mode', I can get the RaceCapture to read the fuel level. But it's quite wrong. My OBDII scanner says 24%, and the RaceCapture says 4%. So I guess I have some learning to do.
_________________ TT5 Mazda RX-8
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Fri Apr 13, 2018 2:59 pm |
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brentp
Site Admin
Joined: 24 Jan 2007
Posts: 5299
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Hi, are you running two OBDII devices at the same time on your OBDII connection? OBDII passive mode in RaceCapture is designed to let another OBDII device "request" the data, and RaceCapture just listens for the response.
_________________ Brent Picasso
Founder, Autosport Labs
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Fri Apr 13, 2018 3:09 pm |
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Dadspeed
Joined: 18 Mar 2018
Posts: 13
Location: Champaign, IL
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I only have another OBDII scanner connected for debugging purposes.
I started using 'passive mode' because, without it, I see all kinds of craziness in the OBDII PIDs on my scanner.
_________________ TT5 Mazda RX-8
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Fri Apr 13, 2018 3:26 pm |
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brentp
Site Admin
Joined: 24 Jan 2007
Posts: 5299
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Got it. thanks for clarifying.
_________________ Brent Picasso
Founder, Autosport Labs
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Tue Apr 17, 2018 5:00 pm |
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The time now is Thu Apr 19, 2018 10:45 pm | All times are GMT
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