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Debate y preguntas relacionadas con el curso "Comunicaciones CAN Bus Decodificadas"
= Hilos resueltos
I have a 2014 MB C250 Sport that I am unable to start. Long story, but it started with replacing the cam adjusters. With those, I replaced the timing chain, cam shaft position sensors, chain tensioner, ignition coils, plugs, and I had the ECU repaired. There was a leaking capacitor in the ECU, and a bad ignition module. Everything checks out, but I'm still not getting any spark.
I haven't checked the crankshaft position sensor yet. Before I start checking continuity of each wire to the ECU, I was wondering if there's a way to sniff the CAN bus and figure out where the signal is failing from the ECU to the coils. I don't know if there's an issue with a signal on the CAN bus, or if there's a broken wire between the ECU and the ignition coil.
Can I do this with a CAN bus sniffer?
Hey Kristan,
Coils aren’t fired over CAN, so sniffing the bus won’t show you where the spark is being lost.
Before going further, can you let me know what ignition module was replaced? The only one I could find that’s relevant on your car is the key switch (EIS). If that’s been replaced and not coded to your keys and ECU with a Mercedes tool, it would cause a no start.
Also, how many wires go to each coil plug? Just two, or more? That’ll tell us if they’re dumb coils fired directly by the ECU or if they’ve got a driver built in, which changes how we test them.
Once we know that, I can point you in the right direction for testing
