Hello, hope i can get some help with this before i take it to the MB dealer. In this car, i can turn the key ,dash lights illuminates,i can move the shifter from P to R, or to D, but car does not crank ,i can get it to crank by grounding the relay and cranks all right. I think is the ecm ,not sure, the ecm gets the signal from the EIS and from Transmision by CAN, thats the only thing i know. In my scanner it shows ,(MB start enable=no) when i turned the key to crank position circuit 50 turns on but starter won't function. I just want to know if that could be the EIS or maybe bad ecm because the starter relay gets the signal from ecm. Thank you.

 

moved to X164 forum...

 

Weird things happen when the main battery is failing.
Have you checked it?

 

Hey, it has two batteries, the big one is 12.55 and the small one is 12.40 , i think is good.

 

Do you have DAS/Xentry?

You need to see what DAS has to say about start enable. I have recently had issues with my GL450, but no start was due to a frozen motor in the fuel pump. Even though DAS did not see the issue.

 

Hello ,no i don't have DAS/Xentry, I'm using the ehos tech from snap on and also using autocom delphi, i going to use my friends modis from snap on ,bacause i have tried to activate the fuel pump and i can't hear any sound ,sometimes if i touch the engine computer that is on top of engine it gets very hot ,and don't know why if the engine is off. But thank you very much for your input .

 

Fuel pump will engage when engine is cranking. Some GL450 had a simple relay setup and some had Fuel Pump Control Module. If you send me your VIN I might be able to confirm if that is the case.

As for hot ECM - it might be a sign that there is some kind of short that heats the module. I assume you have checked all fuses in the engine bay, under the passenger seat and in the trunk? I would check not just with a digital voltmeter, but with a control light.

 

Hello thank you everyone ,it was the fuel pump , my brother helped me to change it and car now starts. Thank you again.

 

Apparently this is becoming a frequent issue on our aging cars

 

Yeah, I really wish I'd done mine on a preventive basis. Cost me $1K because I was under the gun.