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Our Merc C240 will not crank over at all

Tiny
ANONYMOUS
  • MEMBER
  • 2003 MERCEDES BENZ C240
  • 83,000 MILES
Our Merc C240 will not crank over at all. Battery is fine as everything else works, voltage tests fine and will not start with a jumper battery either.
It was running rough earlier so I put a scanner on it. It showed a Crank sensor code. I have a new sensor and I'll be installing it hopefully tonight, if I can get to it.
Question is, wouldn't the engine crank over at least, if it is just a crank position sensor problem?
If the sensor has failed completely, can that prevent the car from even turning over?
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Wednesday, April 10th, 2013 AT 2:58 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Trouble codes does not necessarily mean the component is faulty. It is an indication of a fault in the circuit and can be due to wiring etc.

Generally cranking are not affected by faulty sensors but for your vehicle, starting signal is sent by the ME-SFI control unit and trouble codes might affect the cranking circuit.
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Wednesday, April 10th, 2013 AT 4:07 PM

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