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Microsoft broke into my office and vandalized my work!!
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IanB:

--- Quote from: james_s on November 12, 2021, 03:14:37 am ---I'm not a fan of the level of computer integration in Teslas, but as far as I know it won't ever just force you to update at whatever random time it sees fit.

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Doesn't it do automatic updates overnight?
james_s:

--- Quote from: IanB on November 12, 2021, 03:36:30 am ---Doesn't it do automatic updates overnight?

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Not that I've seen. It lets you know there's an update available and you can choose to install it. There might be a way to have it automatically update overnight but I sure wouldn't set it to do that, it would be a disaster if you had an emergency and needed to drive somebody to the hospital or something late at night.
james_s:

--- Quote from: BradC on November 12, 2021, 03:35:57 am ---On the other hand, my 1988 Volvo has 3 ECUs (Fuel, ignition & ABS). <shrug>

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And they are completely independent, aside from an analog engine load signal from the ECU to the ignition box.
BradC:

--- Quote from: james_s on November 12, 2021, 03:55:12 am ---And they are completely independent, aside from an analog engine load signal from the ECU to the ignition box.
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Actually, not quite. Ign sends timing info to the FI and a separate urgent "please richen the mix, I can't stop it knocking" signal, and the FI sends a PWM load signal to the FI. Regardless, if either die then it's time to get out and push. Oh, and in fact the ABS ECU sends a vehicle speed signal to the FI also and odd things happen if that goes missing.

Easy to fix with hand tools and a worst case a CRO for diagnosis, unlike the Antichrist which needs a separate diagnostic computer just to figure out which of the 9 high speed CAN BUS ECUs is actually causing the cascade fault putting the thing into limp mode.
james_s:

--- Quote from: BradC on November 12, 2021, 05:28:35 am ---Actually, not quite. Ign sends timing info to the FI and a separate urgent "please richen the mix, I can't stop it knocking" signal, and the FI sends a PWM load signal to the FI. Regardless, if either die then it's time to get out and push. Oh, and in fact the ABS ECU sends a vehicle speed signal to the FI also and odd things happen if that goes missing.

Easy to fix with hand tools and a worst case a CRO for diagnosis, unlike the Antichrist which needs a separate diagnostic computer just to figure out which of the 9 high speed CAN BUS ECUs is actually causing the cascade fault putting the thing into limp mode.

--- End quote ---

I forgot about the enrichment signal, in most cases that shouldn't really be active though, especially the non-turbo models, I've tinkered with a lot of older Volvos and I've only ever encountered pinging on the turbos. I had the ABS relay fail once which turned on the warning light in the cluster but I don't recall it causing any problems with drivability for the couple of days before I found the relay and fixed it. That was a 1987 740 which was an odd duck in that it had the optional ABS which was rare that year, but unlike all later models the ABS system was hidden under the trunk bottom in the well behind the right rear wheel, took me a while to figure out where it was. No special tools needed to work on it, but on the flip side the LH 2.2 system had no built in diagnostics at all.

The hardest to track down problem I ever had with that car was an occasional misfire under boost only in hot weather. I finally figured out it was bad spark plug wires, it was arcing around the plug boots when they were hot and the higher cylinder pressure under boost resulted in a higher voltage across the spark plugs.

This is totally off topic for the thread though.
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