Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Check and make sure fuel is making it to the fuel filter and from the fuel filter to the engine.If the fuel filter itself is restricted it will cause this type of fault here and will need replaced.I have seen the fuel filters restrict as well as restricted or damaged fuel lines cause this type of fault here needing corrected/replaced.If this has already been checked and found to be o.k. let me know so we can continue.
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Besides the crank sensor itself at fault the only other thing I can think of here is the wiring to the sensor possibly being damaged needing repaired or replaced.
Is the theft/security light on steady or blinking at all when cranking over the engine or when you release the key when it wont start?
Just to be sure here,this didnt have any issues until the wiring harness was replaced am I correct?
I apologize for the delay.
With a scan tool connected to the vehicle if you crank over the engine on the scan tools data list do you see an engine rpm signal at all?
This is a tough one for me to answer myself here as my info is also limited with no wiring diagrams available on this here.
I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.
I have read your story so far, and I feel for you with this issue.
Your P0500 is vehicle speed, not engine speed.
So output shaft speed sensor on the transmission.
I'd say you have a ground issue common between the VSS code above and the no-start condition.
Is this car auto or manual transmission?
I'll see what I can find for a circuit diagram.
I think that you'll agree that 2.5 volts to the crank sensor needs to be sorted.
Difficult to find a circuit, still looking.
I would disconnect all other sensors one at time while observing your crank sensor reference voltage. If it kicks up to 5v or even 8v, then possibly the last sensor is the cause.
I can't find a circuit, but wouldn't it be odd if the VSS is fed by the same feed.
And your P0500 could be a faulty VSS pulling the supply volts down etc?