CAN BUS TROUBLE SHOOTING

Ask for and share advice on using the PicoScope kit to fix vehicles here.
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ronw38
OneWave
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Joined: Sun Aug 27, 2017 8:00 am

Re: CAN BUS TROUBLE SHOOTING

Post by ronw38 » Tue Apr 24, 2018 9:08 am

Your methodology makes sense , where are the scope patters to support it .If you have solved problems with this present the data .We all learn from participation and sharing

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RYM6746
TwoWaves
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Joined: Tue Nov 01, 2016 8:58 am

Re: CAN BUS TROUBLE SHOOTING

Post by RYM6746 » Sat May 12, 2018 8:38 pm

These are just notes that I have written down to help people whilst they are trying to trouble shoot a CAN fault. They can just pop on here and run through the list and see if there is a step that they have forgotten/missing. It is not a a case study or a diagnostic discussion. Its merely a diagnostic aid to help someone out if they are struggling. Sorry for the lack of scope captures

pepe1125
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Joined: Sun Oct 07, 2018 10:51 am

Re: CAN BUS TROUBLE SHOOTING

Post by pepe1125 » Sun Oct 07, 2018 11:27 am

Hi,

We have a CAN BUS communication issue.

We measured the CAN H and CAN L data line and one of the signal level is LOWER than the others.

What's caused this? :|
Attachments
CAN PROBLEM_01.png

liviu2004
TwoWaves
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Joined: Sat Mar 19, 2016 8:23 am
Location: Netherlands

Re: CAN BUS TROUBLE SHOOTING

Post by liviu2004 » Mon Oct 08, 2018 10:11 am

Connector / wiring extra resistance, power supply to the respective module insufficient, bad CAN transceiver inside module.0

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