W210 CAN bus issues - PeachParts Mercedes-Benz Forum

jay_bob · #1 06-20-2018, 04:47 PM

Ok now it’s my turn for more fun. Sold the wagon to VStech and sure enough 2 of my 4 cars decided to protest. At the same time.

On Saturday, the E320 has lost its Y3/8n2 sensor on the conductor plate. It’s going to the dealer tomorrow, can’t DIY this one. $$$$.

You have to do a 722.9 transmission service on a lift since it’s a bottom filler. I have no easy access to a lift. And to make matters worse, they won’t sell you a conductor plate, because you have to code the new plate to the car, and it requires legit Xentry that can phone home. I knew this going in, I pulled diagnostics when I bought the car, and the error was in the history. I got the seller to drop the asking price about what it will cost for the dealer to fix. Just bad timing.

But on to the main part of the story:
On Sunday I did an oil filter and air filter change on the E300. 248k miles, been practically trouble free the 5 years I have owned it.
Got all done and went to crank it and it would crank but not start.
Acting like it had no fuel. It would spin for a few seconds and sound like it was going to catch and then the auto crank would stop the starter.
WTF.

Dug into it and determined that the fuel valve was not opening. No voltage at pin 4 of X22 (the fuel valve drive signal).

I thought, the only thing I unplugged was the MAF to make it easier to take off the air filter lid to change the filter. I checked and I had +12 and +5 V at the sensor, so that ruled out losing the sensor voltages from the ECU.

Tried to open the trunk and the PSE pump was cycling but the trunk would not open.

Got the computer hooked up and the CAN bus system is throwing faults left and right. On both the engine bus and the body bus.

I was able to clear the faults and everything scanned clear (except for one door control module that was reporting failed). I was then able to start the car like nothing happened.

Took the car for a shakeout run and sure enough about 5 miles from the house, it just flat died going down the road. I coasted into a parking lot and hooked the computer back up. Same thing, practically every CAN related fault showing on both buses. Cleared again and got it back to the house.

Had to run to Texas for a work trip Monday morning through today. So luckily older brother is out of town so younger brother could drive the ML320.

Obviously something failed non related to the oil change.

Maybe EIS failure, that is the device in common to the two systems.

Anyone out there got any ideas?

I’m going to try to get on it after dinner, first thing I am going to check is system voltage. I wonder if the alternator is going south.