Quote:
Originally Posted by TimFreeh
Because Mercedes always over engineers everything maybe? A fuel shutoff isn't going to take the place of the traditional rack shut off implemented on the mechanical pumps.
Do you have your mechanical OM603 pump yet? Why not just install it now and bypass the whole silly Mercedes start authorization thing?
The more I see/learn about the start authorization process and the attendant multiple computer modules that are married together and have to be version coded when replaced combined with sending rolling codes back and forth across the CAN the more absurd the whole scheme seems.
You'd think, given the complexities, that we're authorizing the launch of nuclear missiles? Rube Goldberg would be envious of the DAS process.
Your scan tool data seems a little weird, why is it reporting an RPM value when the engine isn't running? I'm always a little leery of these aftermarket scan tools.
According to the tool though the ECU is showing no authorization, I think this is the problem you're facing. The fact that the EIS clicks and unlocks when you insert the key tells you that the EIS does recognize the key. At that point its supposed to contact the EDC pump ECU and request start authorization - but apparently that's not happening.
Some of the documentation of the DAS3 process indicate that the EIS sends a code to the EDC control module for authorization, not sure how this process works or how to troubleshoot it but I'd guess Star Diagnostic tools and an experienced tech would be required. It's going to be hard to find people that remember how to work on a 24 year old low-volume Mercedes computer controlled diesel that was only in production a couple of years with the EDC system. Even then suppose the EDC control unit is determined to be faulty? The ECU's for the later W211 CDI's are no longer available and when they were it was the better part of $2k for replacement. The EDC system seems to combine all the complexities of computer control with none of the benefits of the later OM613 and OM648 CDI systems that at least could offer multiple injection events and much more precise fueling strategies. The EDC system is the worst of both approaches with none of the benefits.
Just put the mechanical pump on and do away with all the DAS nonsense.
|
I bought the w210 for the motor. I want to confirm it runs before yanking it and ditching the car along with the EDC then refreshing everything on a stand.
I feel like putting up with the DAS to get it running first is probably easier than pulling the glow plugs for a compression test....
So we are sure that jumping the K40 relay while giving pin 3 on the shutoff solenoid 12v won't bypass the whole situation? Or are you saying that the rack position won't pump fuel at all? I didn't know such a position existed other than the 603 racks where you physically move a lever to reach it.