Q&A Forum
Has anyone actually used the Holley Sniper CAN bus to send data to the YourDyno controller? I paid the license fee and Jostien installed it. I can't seem to get it to read though. I have tried the CAN wires in both locations. Is there some minor step in the setup I am missing? I wanted to use CAN RPM for the main RPM input since I am using an automatic transmission on a roller dyno.
Do you have a DBC file for the Sniper system?
If the answer is no the attached file may help.
I tried the preloaded Sniper V2 selection and also tried loading that file myself. This sniper also has the v2 firmware. As far as I can tell everything should be set up correctly.
Couple questions
- 1. YourDyno or YourDyno Unavision
- What version of YourDyno hardware (I believe earlier versions did not have built in CAN)
- That said onboard CAN or separate USB CAN device.
- Software open-Options-CAN Bus: if you "Enable CAN Bus" do you see activity below in the "CAN bus analyzer" section below. YourDyno powered up and Holley Sniper powered up.
- What is the CAN bus speed set too? default is normally 500kbit/s but I think the Sniper maybe 1000kbit/s
- Hardware, with the Holley Sniper powered down connected an ohm meter to the CAN bus wires, what is the resistance and what is connected at the time of taking the reading.
I am a big fan of CAN but it also can be tricky~~
I am using the newest version of Univision software with the v5 control box. It has CAN H and CAN L terminals. This is only about a year old give or take.
There is no activity when I click enable CAN bus.
I have tried all 3 available speeds but did some googling and settled on 1000
I can check the resistance next time at the shop. But, I’d be real surprised if there is an issue there. This is far from my first experience doing custom CAN stuff with Holley EFI. The dyno is getting the signal from a Y cable and the digital dash is working fine through all of this. I also tried unplugging the dash on the off chance they couldn’t both be connected.
If you are Y-cabled into the CAN at the digital dash the you should see some CAN traffic if the dash sees traffic. Technically the bus architecture is a little wonky but it should show data.
Do you have any other USB CAN devices you can connect to the CAN wires you ran to the YourDyno box? Kvaser, Peak, virtually any CAN device that can sniff?
Where are you located?
The first thing to do is ensure you have CAN bus activity on the bus. Click Enable CAN bus and turn on the CAN Analyzer. There should be data flowing.
If there is nothing, try swapping the CANH and CANL. You can also add a ground wire from the car's 0V to a YourDyno 0V input.
You may need to turn on the CAN output in the ECU.