Snap-on Live Training Episode 08 - Data Bus Testing and Diagnosis Part 2

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Time Stamps
00:00 - Intro
02:20 - Communication Networks
02:44 - Voltage Differential
04:07 - Data Link Connector (DLC)
06:36 - High-Speed CAN
10:52 - FlexRay
13:20 - MOST (Media Oriented Systems Transport)
16:52 - Ethernet (DoIP)
27:27 - Live Walkthrough
34:57 - Continue Your Training

[stephenjwheeler]

Thanks so Very Much for the invaluable training!

[AustinCraig-eu]

Should a CAN bus signal look the same no matter where you check in the circuit? As an example: If I check at the DLC and then check at the abs module, will I see the same waveform?

[troylegere]

Thank you for your time. Very informative.

[eekimus]

Hello, I've been trying to investigate an issue in a 2013 Toyota Landcruiser Prado which runs a MOST Bus for audio. It thinks the amplifier is disconnected. Have installed a new, working amplifier and shows amplifier still disconnected. Have tested entire stereo wiring harness for shorts, short to power/ground, continuity and resistance. Has WUI (wake up in) and WUO (wake up out) wires which show battery voltage as required. Have you scoped the MOST lines before? Should they be 5V differential pattern like a CAN? Similar resistors in the controllers? There is 1 more wire called SLD - any idea what it is? Thanks.

[lamboricer]

Wifi flashing is so stupid. I remember i had a vehicle in the shop that needed a transmission flash. My shop wifi was crappy and i couldn't flash it because the guy at the other line couldn't connect to the vehicle. So I had to tow the the dealer .🤦🏽‍♂️

[jmyers]

i can't wait for an EMP so i can go back to points and plugs

[pauldorkins]

Great vid btw!
I had a skoda yeti with can comms issues on loads off modules! I scoped it at gateway and wave pattern was bad. Checked with m meter and had o/c! Found problem with A-post wiring which I renewed can signal was good codes cleared but using a meter it was still o/c! Please any explanation 🙏 just started using a pico thanks in advance!

[iamsmiley]

Is it possible to know from wiring diagram, if a vehicle has fiberoptic MOST bus? How will I know 🤔

Thanks Jason and Snap-on!

[wanazizul]

I measured Merc Clk200 pin 6, 14 has small mV only, car has no AC, radios, power windows, steering turns wiper, seats control, except car can start and run ok. Ground pin 5, 6 ok, 16 powr 12v ok, how do i check signal hi lo why it disappeared or shorted somewhere, pls help

[kevencausby]

I see note about the Triton D8 needing that cable. Does the D10 also require it as well?

[kashinathhegde]

Tell something about EV circuits. Does these have similar bus?

[rafaelordonio]

Hello, do I need to disconnect the car battery first before resistance test of the obd fort?

[jeffowensby]

Security lite came on and will not start after changing the starter what is the problem

[One_DeepNation]

So what does CAN high and CAN low actually do? Like what’s their purpose?
Is it one for communication and the other is for ground?