2020 Ford Transit NO Blower No HVAC Communication
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- Опубліковано 27 сер 2024
- Interesting problem on a 2 year old vehicle. This is an example of my approach for diagnosing this problem. If you are interested in learning more about the usage of Pico Scope and diagnostic testing be sure to check out the membership site at courses.handso...
If you are not experienced or do not posses the proper tools or knowledge leave it to the professionals. NOT Responsible for your mistakes this video is for entertainment purposes only.
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Unless someone is bored and loves unplugging modules there’s no efficient way of diagnosing this CANBUS issue without a scope. Superb job, Brian!
Another great find! Great job! That can bus pattern did look beautiful afterwards
AWESOME great approach and thought process you did it again thanks for sharing brother.
Excellent! you never disappoint!
This video saved my job, I thank you very much.
Thanks Brain for the invite
Sometimes its easier to check for high resistance with an ohmeter tp pinpoint which wire is. I’ve done it on many cars and its easier. Yes scope is great but to know exactly which wire the ohmeter is a better choice. 👍
Hi Vicken, thanks for watching and also for your comment. I personally have been relying more on the voltages read from the scope for gaining my direction lately. I feel a case can be made for either way. Here is my take on a few things.. Depending on the network design AND the type of fault makes a huge difference on the results. On the vehicle in the video I did not get out the Ohm meter so I don't know what the readings would have been, However seeing the H&L voltages together would most likely be a much lower resistance than the 60 we would normally expect. At this point I would probably still have the same process of divide and conquer the network as usual and get the same results. I recently was on a Ford F series that had COMM issues due to wires corroded to each other and the resistance of the buss was constantly changing between (wires wet too!) Disconnecting the PCM (terminating module) made no change on the resistance, however the scope pattern changed from shorted to each other to a more normal pattern, and also comms came back to all the modules before the fault!? After all this I guess the take away is use the tools at your disposal to get a result. Ohm checking is a great go no go in my opinion, if it gives you good direction roll with it and divide and conquer the network, if nothing solid can be determined I get the scope out.. lately I have been doing the scope 1st with decent results, sometimes busting out the ohmmeter to get direction. Have a great weekend and thanks for making me think!
@@BrianMann216 Thanks Brian. Yes i use scope too on bus communications. Like you said it depends on the bus design. Sometimes the scope confuses me which circuit is shorted or open. Is some cases yes the scope is faster like on some Toyotas they have problem where the dash gauges won't work and the power steering is hard to turn. Disconnecting the steering angle sensor brings the pattern back to normal. On some cars its pain and ohmmeter guides me where to go and makes it easier to find shorted or open bus line. Thanks Brian , waiting for new videos. Have a great weekend.
@@vickenkaragozian2041 as we (I) continue to learn and get more experience my eyes open to the multiple ways to get a job done effectively and efficiently. Next can bus comm issue I will be sure to ohm , just to see what information it yields in addition to the voltage on scope..
Brilliant Brian cheers sandy
Great find, and great video! Thanks for sharing Brian! And whatever that chemical was, looked nasty
Merci pour la vidéo très instructif 👍
Brian thanks for sharing I have a strong feeling from the looks of contamination and the highly corrosive materials this vehicle could be your ticket to retirement Lol. For a 2yr old vehicle I think it’s days are numbered. 👍
great video thanks greetings from belguim
Hello , thank you for watching!
So my 20 T250 is have a similar issue. AC stopped, blower works fine. Went through all the fuses and relays. At times the controls would just go out and come back while driving. Would you lean more towards the controls with the knobs?
We work on tons of these vans and are now seeing issues with the hvac system. We have 3 vans right now all showing the exact same symptoms. Hvac control module not working at all. All 3 are showing all kinds of varying warnings on dash but no engine light. Check the fuses and even bought a hvac control module to use as a genie pig with no fix. Your electrical skills Brian are on point and are admired. Any tips?
Scope that medium speed can bus, .
Altleast the transits are basic with no interior panels to remove. I had a 2022 transit connect from Dayton children’s hospital with can problems. Dang mouse chewed up the wiring in 2 spots
great find....are you just using fdrs i had ids but never used it much
Yes that was fdrs. When you purchase your ids or fjds sub you also have access to fdrs. Fdrs vehciles started with the 2018 expedition and ecosport, and I think by 2021 or 2022 all are fdrs
Hello, 2.5V is not the average voltage of the comm waveform, the 2.7 volts on the one trace was correct, this is what a multimeter would read as the average, I would also expect the low side to read about 2.3 volts. The original elevated voltage you had would have been the giveaway to find this without a scope but with enough hunting to find that corroded connector would have found the problem ith the service data available, bypass the connector just as you have done and erase the codes, and turn the HVAC on and done, not easy but doable knowing the 2.7V and 2.3V information would help with a regular multimeter. Next time try CAN voltages on a good system and you should get what I mentioned and no need to move the readings to 2.5V on your scope as now you know brother. Thank you for the case study.
Looking back I can always do a better job when Speaking on the fly Now the bias voltage should be 2 and a 1/2 volts I messed up and probably said average when I meant to say bias
That looks like Salt Water Flood Damage. I use Ultra Gray Gasket Maker to Seal and Enforce the Harness Damage.
Without a scope, I'd say eventually somebody would GUESS to replace the entire interior harness and fix it, not even knowing what the issue was.
Ｐ𝐫Ｏ𝕞Ｏ𝓢ｍ