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Old 27-03-2022, 02:47 PM   #1
Citroënbender
DIY Tragic
 
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Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,499
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Default Question: CAN Network Sleeping

I’m stuck with an Alfa, which has spontaneously refused to start and run.

It has two CAN networks. The body one (doors, windows, lights, dash) is fine.

The drivetrain network is not playing. My reading of the service manual says it wakes when you turn the ignition on (which is when it bombards me with a flurry of errors).

To generalise, when a network is asleep, is there any traffic? Or is it stone-cold dead until the wake-up packets are sent?
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