Position of ecu pms on C180 facelift

Discussion in 'Engine' started by Jospek1985, Jul 9, 2017.

  1. Jospek1985

    Jospek1985 New Member

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    Hi,in the w202 C180. '97 facelift where is the ecu pms?under wash reservoir is noting.
    Thanks
     
  2. Dec

    Dec Hardcore MB Enthusiast

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    [​IMG]

    I think its the top one. Remove 4 screws to access, beside washer bottle.

    Dec
     
  3. OP
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    Jospek1985

    Jospek1985 New Member

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    Under, this is a ecu?
     
  4. Dec

    Dec Hardcore MB Enthusiast

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    “Connectors 0, 1 and 2 are on the ESP/ETS/ASR module - no.1 is the CAN wires.
    Connectors 3 and 4 are engine ECU - you can again see the CAN wires in plug 4.
    All the rest are on the K40 module, which is mainly involved with voltage supply and starter output. 11 is the starter relay, 12 is switched and permanent live supply, 6,7,8,9,10,13,14 and 21 are power outputs and inputs to eg switch the internal relays in the K40 (there will be 2x probably, in addition to the demountable starter relay).
    Fuses are obviously there to protect the voltage outputs.”

    Source… Identify electrical connections? | Mercedes-Benz Owners' Forums

    Dec
     
  5. OP
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    Jospek1985

    Jospek1985 New Member

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    Thanks, but my question is.
    The pms ecu in 97 facelift is like this?
    I don't find in the car
     

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  6. grober

    grober MB Club Veteran

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    Post a picture of your engine compartment please.
    Does it look like this
    [​IMG]
    or this

    [​IMG]
     
  7. Dec

    Dec Hardcore MB Enthusiast

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  8. grober

    grober MB Club Veteran

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    Thats a picture of the early PMS injection/ignition ECU. By 1997 a new HFM system had been adopted which possibly has a very different looking ECU. You can tell which system is being used by looking at the inlet system - that's why I asked you to post a picture of the engine compartment?
     
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    Jospek1985

    Jospek1985 New Member

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    My under bonnet is like second images.
     
  10. grober

    grober MB Club Veteran

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    That means you have the later HFM system so you wont find a [ PMS] ECU like the one in your picture. :(
     
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    Jospek1985

    Jospek1985 New Member

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    ok. Mystery unveiled.
    So the ecu hfm is that big gray box
     
  12. grober

    grober MB Club Veteran

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    The ECU is going to going to be a metal rectangular box with 1 or two plugs at one end which slots vertically into that big grey box.
     
  13. OP
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    Jospek1985

    Jospek1985 New Member

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    Thanks, and is it likely that the ECU will be burned?
    1 and 4 cylinder not run
     
  14. grober

    grober MB Club Veteran

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    Your car runs a lost spark system from two coils hidden inside a recess in the camcover.
    one coil fires 1 and 4 and the other 2 and 3. You could have a faulty coil or the "signal "wire from the ECU is damaged or the power transistor in the ECU has gone. These can be repaired relatively easily.

    see https://www.mbclub.co.uk/forums/2489022-post13.html
     
    Last edited: Jul 10, 2017
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    Jospek1985

    Jospek1985 New Member

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    Can it be repaired then?
    Does anybody in the forum do that?
    Because in my country is no possible repair....I will do it!
     
  16. grober

    grober MB Club Veteran

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  17. grober

    grober MB Club Veteran

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    [​IMG]
     
    Last edited: Jul 10, 2017
  18. OP
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    Jospek1985

    Jospek1985 New Member

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    Ok, i try to repair.
    The w124 have a same ecu? Hfm?
     
  19. grober

    grober MB Club Veteran

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    If it has the same 4 CYLINDER M111 engine it will be similar but I think in 97 the car moved to a canbus system meaning they would not be directly interchangeable. Some earlier W202 cars with an HFM ECU [ the 2.2 litre for example] would be but not your one.
     
  20. OP
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    Jospek1985

    Jospek1985 New Member

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    Grober, but when the ecu is out, the injection on the 2 cylinder out is off?
     

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