Mercedes

Have Mercedes Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Mercedes

I have a 2006 smart car diesel that will crank but not

Customer Question
Hey, I have a 2006...
Hey, I have a 2006 smart car diesel that will crank but not start. Has a new crank sensor. Not saying it's good. I have a p0500. Weird thing is all of the engine controls have been swapped from a running vehicle as the engine in this car had timing chain issues. The only thing we haven changed is the egr valve and the crank sensor. However a crank sensor was installed onto this engine in attempt to fix it
Submitted: 1 year ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Answered in 13 hours by:
12/28/2015
Mercedes Mechanic: Pete, Mercedes Mechanic replied 1 year ago
Pete
Pete, Mercedes Mechanic
Category: Mercedes
Satisfied Customers: 29,485
Experience: Over 15 years experience as a Mercedes dealer technician
Verified

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.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
Hello. Sorry my first question was a little vague. We are a licensed shop and I should have told you all of the preliminary checks have been done. The injectors are not being turned on and p0500 is for the vehicle speed sensor (which I guess is the crank sensor) I pin tested the crank sensor circuits with no fault and I am going to install a different make of a crank sensor. As I can't really see it being anything else. Any ideas please let me know. I will let you know if the crank sensor fixes it
Mercedes Mechanic: Pete, Mercedes Mechanic replied 1 year ago

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.

Thanks Pete

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
Installed the new crank sensor and still no signal to the injectors and no power at the injectors. Not a fuse issue. Again this engine and transmission assembly did this same thing in another car and since literally everything engine wise has been swapped. Only thing left is transmission related. This car did not have this issue before and we swapped the engine harness as well
Mercedes Mechanic: Pete, Mercedes Mechanic replied 1 year ago

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?

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
No, theft light isn't on. I wish. And we didn't disconnect the battery and it has the original computer in it as well
Mercedes Mechanic: Pete, Mercedes Mechanic replied 1 year ago

Just to be sure here,this didnt have any issues until the wiring harness was replaced am I correct?

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
No sorry, I'm gonna do my best to explain this. The car that we took this engine from had this same issue, will crank but not start. However this engine only has 32000km on it. So the car that we put this complete engine and transmission assembly from has the same issue in the new car. The only thing wrong with the engine that was in the car originally was the timing chain was getting noisy. So we took every part off if that had to do with fuel and sensors as well as the starter and alternator. We used the harness that this car had because the car worked fine. The only thing left is the transmission and transmission sensors actuators that we kept from the car that had this issue. And this engine did run perfectly for about 30 minutes after the swap however quit after a short drive and now will not start again. I even grounded the circuit for the oil psi sensor to make sure the sensor wasn't faulty.
Mercedes Mechanic: Pete, Mercedes Mechanic replied 1 year ago

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?

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
it takes about 3 seconds of cranking and than it will pop up 340rpm and stay there. I did a signature test on the crank sensor and it looks like a weak ac sign wave. There is only 2.5 volts going to the sensor. I'm a Gmc guy with a lot of experience in domestic diesels and I know they all have 8 volt reference's to there crank sensors with the key on. But finding info for these smart cars is like pulling teeth
Mercedes Mechanic: Pete, Mercedes Mechanic replied 1 year ago

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.

Thanks Pete

Ask Your Own Mercedes Question
Mercedes Mechanic: Gary, ASE Certified Technician replied 1 year ago
Gary
Gary, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1,247
Experience: Senior Technician
Verified

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.

Gary

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
I hear ya with the ground issue. But again there is only one ground from the engine to body as well as the body to battery. Less than .5 of a voltage drop from the engine to the battery while cranking. A schematic of the this would be helpful and as stupid as it may sound I think there is something on the transmission that is causing this not to start. Wether it's drawing down a reference or something
Customer reply replied 1 year ago
I hope I posted that in the right spot so people could look at it
Mercedes Mechanic: Gary, ASE Certified Technician replied 1 year ago

Josh,

Is this car auto or manual transmission?

I'll see what I can find for a circuit diagram.

Gary

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
It is a automatic with the paddle shift
Mercedes Mechanic: Gary, ASE Certified Technician replied 1 year ago

Hi Josh,

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.

Gary

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
Thanks
Mercedes Mechanic: Gary, ASE Certified Technician replied 1 year ago

Hi Josh,

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?

Thoughts?

Gary

Ask Your Own Mercedes Question
Ask Gary Your Own Question
Gary
Gary
Gary, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1,247
1,247 Satisfied Customers
Experience: Senior Technician

Gary is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

28,773 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

3,502 satisfied customers

15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,131 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

591 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

443 satisfied customers

Work and diagnose electronics on daily basis.

< Previous | Next >

Related Mercedes Questions
The blue wire in the back of the alternator has no power
the blue wire in the back of the alternator has no power when the key in switched on,after replacing the battery in 2003 benz s430 4matic so the alternator is not chargong … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
I burn the alternator fuse. Its reading 12 volts. C230
i made a rookie mistake b4 i took of the old alternator i got a spark when taking of battery cable… read more
Matt
Matt
Engineer
Bachelor's Degree
591 satisfied customers
2003 ML350. Replaced alternator and battery. Now car starts
2003 ML350. Replaced alternator and battery. Now car starts but stalls and can't be driven. I've read that it might be a key recognition problem. What are my options. I don't have another key now. Tha… read more
Marty
Marty
Mercedes Technician
Associate Degree
28,773 satisfied customers
2003 Mercedes E320 Serious battery drain. Battery is
2003 Mercedes E320 Serious battery drain. Battery is draining within in hours after being fully charged.… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
3,996 satisfied customers
Regarding that Mercedes --I didn't mention that the battery
Regarding that Mercedes --I didn't mention that the battery was completely flat and we had to jump the car to get her on her way but my wife only made it about 2 miles before the car shut off. Have no… read more
Marty
Marty
Mercedes Technician
Associate Degree
28,773 satisfied customers
I changed both batteries and alternator and when I start
I changed both batteries and alternator and when I start car, it will not shift out of gear, radiator fan does not work, right headlight will not come on, and the code : "reduced braking power" shows.… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
1987 300SDL alternator (original) bearing was making very
1987 300SDL alternator (original) bearing was making very loud noises. I replaced it with a new one (not reman) and fully charged the battery before driving. 30 minutes into the drive, most dash light… read more
Marty
Marty
Mercedes Technician
Associate Degree
28,773 satisfied customers
Lou my alternator has label some numbers and it says"
Lou my alternator has label some numbers and it says " Remanufactured" does that means that its not original alternator from the factory?… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
Dead battery. Unable to open trunk to get to the battery for
Dead battery. Unable to open trunk to get to the battery for jump start … read more
Matt
Matt
Engineer
Bachelor's Degree
591 satisfied customers
I am having a problem with either my battery or alternator.
I am having a problem with either my battery or alternator. 2005 Mercedes e320 base model gas. … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
A warning light just came on that said "Alternative battery
A warning light just came on that said "Alternative battery malfunction". … read more
Eurocar Inc
Eurocar Inc
Master Audi/VW Tech
Associate Degree
1,773 satisfied customers
The transmission is in limp mode. Transmission fluid is
yes my airmatic system I put new struts in now if I let the car sit over night the air leaks… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
My alternator is not charging the battery although the
My alternator is not charging the battery although the alternator is test that it is good. … read more
Pete
Pete
Mercedes Mechanic
29,485 satisfied customers
Got water i think in alternator while cleaning battery light
got water i think in alternator while cleaning battery light on also gauges don't work and turn signals as well … read more
Shawn Few
Shawn Few
AS
63 satisfied customers
03 clk320 will turn over but not fire, Alternator, battery,
Alternator, battery, and crank sensor already replaced … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
It lit up a warning light that says: "Alternate battery Low"
It lit up a warning light that says: "Alternate battery Low" … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
Malfunction light on Battery/alternator visit work shop and
Malfunction light on Battery/alternator visit work shop and also Under Voltage Switch consumer off… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,502 satisfied customers
Battery drain. Replaced the alternator, too. 2010 E350. I
I have not. I had a local MB repair shop replace the alternator. I have an appt on Monday with Mercedes Benz South Charlotte … read more
rpmdiag
rpmdiag
High school
7,107 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x