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E220 cabriolet 1996 starter problems

Discussion in 'MBO, our Mercedes club' started by Janin, Jul 7, 2017.

  1. Janin

    Janin New Registration

    Likes Received:
    Jul 7, 2017
    Your Mercedes:
    E220 Cabriolet 1996
    Engine won't fire when starting even though fuel system appears to be engaged. The battery is fully charged and I don't think it is the remote or immobiliser as the ignition is not dead. I had the same problem last year and Mercedes said it was the High Voltage Relay system. They replaced the part and it worked until now. Interestingly, the ABS warning light came on the day before the starting problem occurred. I understand from other messages that there could be a link.
    The car has done 80k and is in very good condition. I am desperate to resolve the problem.
  2. grober

    grober Senior Member

    Likes Received:
    May 15, 2002
    Your Mercedes:
    W204 C200cdi estate
    The OVP overvoltage protection relay powers the engine ECU, ABS unit and idle controller. It can have 1 or 2 fuses on the top of it. Sounds as if one or more of the fuses has blown or the OVP has gone faulty----again. If its failed its probably due to being asked to draw excessive current which would indicate a fault further down the line which should be investigated.
    1 check fuses
    2 check OVP outlet voltage
    3 if no output replace OVP
    4 Check why its drawing so much current

    ps as a further complication- sometimes the aftermarket immobiliser can be set to disable the OVP to prevent the car starting-- this may prevent the OVP from operating correctly if the immobiliser is failing to disarm completely- if this is the case then there will be evidence that the OVP wiring has been modified. If this is the case you have two choices - re-instate the original wiring [ no immobiliser] or replace the immobiliser

    maybe the mods can move this to the correct section??
    Last edited: Sep 6, 2017
  3. d215yq

    d215yq Senior Member

    Likes Received:
    Mar 28, 2008
    Your Mercedes:
    1987 W124 300D 250k
    My two E220s had different types of immobiliser (one through the key another through touching a metal disc) and both allowed the engine to turn over if disabled but wouldn't let the car start.

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