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Crank and cam sensors e220 cdi

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by robmc52, Oct 28, 2012.

  1. robmc52

    robmc52 Senior Member

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    Your Mercedes:
    W220 2005 S320 CDI Previously...W210 2002 220cdi, W202 2000 C200T Kompressor
    After a no start yesterday morning, engine spins over fine,but won't fire up, I've removed the crank sensor and would like to test it. Can the wise Mercedes beards tell me if I can measure the resistance with the multimeter? I'm sure I've read in a thread somewhere about this very subject but the search facility won't help me today.

    Actually having just tried it, I get 700 ish ohms from the crank sensor, the cam sensor I'm not so sure. Bridging pins 1 and 2 gives 1.8 or 2.5 if I reverse the probes and nothing between pins 1 and 3 or 2 and 3.

    I would be grateful for any enlightenment, preferably in words of one syllable or less so that I may understand :?

    Regards
    Rob
     
  2. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    The CPS measures between 800 and 1k ohm, the others I do not know.
     
  3. OP
    robmc52

    robmc52 Senior Member

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    Twas the cam sensor. The new one shows a resistance value between pins 2 and 3.
     
  4. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Are you sure you have good fuel pressure and low injector leak off?

    Cam and crank sensors are a rare fault on the 611 engine.
     
  5. OP
    robmc52

    robmc52 Senior Member

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    I wouldn't like to say if the injectors or the fuel pressure are ok or not to be honest. The car was running fine one day and then wouldn't fire up at all the next, I changed the cam sensor and it started first time and is running fine again. Mind you, the battery/alternator warning has started to flash up on the display now (never done that before) so it looks like I've got some more expense to look forward to already.:|
     
  6. television

    television Always remembered RIP

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    The battery may just be low due to the cranking,,see what happens after the car has been running for ½ hour
     
  7. OP
    robmc52

    robmc52 Senior Member

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    I've put another post on about that Malcolm, I found a very useful post that explained how to check the alternator output using the Comand menu, it's charging at 11 to13 and a bit volts which is pointing towards the brushgear wearing out I think.
     
  8. television

    television Always remembered RIP

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    That could well be the case, does you car have a water cooled alernator
     
  9. OP
    robmc52

    robmc52 Senior Member

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    I think it does, I've never actually had a good look at it but I'll to have jack the car up if I get a chance tomorrow and see what make it is. Can't tell from the front as it's filthy dirty.
     
  10. television

    television Always remembered RIP

    Messages:
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    Depending on the make the reg packs are not so easy to change, it has been done and we had a post on this a few weeks back, the make would help
     

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