No electric power No fuel and No pulse

Michael Educator Thohoyandou, South Africa Posted   Latest   Edited  
Question
Electrical
Crank / No Start

I have 2012 Mercedes benz vito viano W639 OM642 V6 cdi with no power in the injectors, no injector pulse and no fuel supply from high fuel pressure pump. I have tried every tricks i have but failed, Please help.

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Robert Diagnostician
Fair Oaks, California
Robert Default
 

Is the engine computer turning on and can you get codes or data? If you can get data, does it show RPM when cranking the engine? i would start there since if the computer is not turning on you will not have those things and if you are not getting a crank sensor signal you may not get fuel pump or injectors either.

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Michael Educator
Thohoyandou, South Africa
Michael Default
   

Hi Robert, it's Mike here, sorry for not coming back to you soon, so i was still trying to do some thorough investigations about that problem. Now i have just discovered that there was a problem of TCM which is faulty, so i have bought another tcm not quit sure it it will work or not. so i am still not sure whether it is the right one or not but i want to past a pic of the original tcm and…

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Eric Diagnostician
Boulder Creek, California
Eric Default
 

Hello Michael, There is no reason to be looking for injector pulse at stage of the diagnostic. But I have to ask anyway; Is there supply voltage at the injector? If you have to go back and measure, forget about it. There is no reason to be there for now. You have identified the issue that needs to be addressed first: No High Pressure Fuel. Let's keep it simple. What is the pre-supply pressure…

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Michael Educator
Thohoyandou, South Africa
Michael Default
 

I am not sure, but there is no power to injectors at all, The error code that i got this times after i have done some changes to fuses are as follows: P0070, P245, P0546 and P02033 with TCM at fault with fault codeU0101.

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