Question about Mitsubishi Eclipse

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I just replaced the ECU with a used one. The car started fine and was able to drive it around. I then heard clicking sounds coming from where the ECU is located. The car then died. It started fine right away but the clicking came back and died again. I waited a few hours and was able to drive it home. There is another electrical part near the ECU. Is this related? The car is a 1990 Mitsubishi Eclipse ES

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  • tondrik Jul 12, 2009

    Hello,



    It is a 1.8 L engine.



  • tondrik Jul 12, 2009

    The Engine light did go on briefly but not for long.



    Do you have any recommendations where to get a new relay?

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  • Master
  • 6,784 Answers

Rule number one, never buy a used ECU. Always purchase new if possible. If the ECU is used, it is good practice to remove the cover and, inspect the circuitry inside the ECU housing for discolorations(burn marks) on the board and, welded solder points before you actually purchase it used.

I will need the engine specs in order to render a proper solution. whats the liter and engine size?

Posted on Jul 12, 2009

  • 2 more comments 
  • Michael Masters
    Michael Masters Jul 12, 2009

    Ok, there is a PCM or ECU power relay next to the PCM or ECU. this is what you are hearing at this time. This is the clicking noise. If this relay is malfunctioning, it will kill the engine. the ECU or, PCM provides the necessary voltage for a variety of sensors and the fuel pump as well. if the relay cant hold the current, ti will kill the engine. replacing this power relay will fix this issue.Its actually called the MFI relay on your model. its basically a ECU power relay. it should be located in the same proximity as the MFI control unit or, ECU/PCM

  • Michael Masters
    Michael Masters Jul 12, 2009

    If the check engine light is on, i would run a scan first to extract any stored codes.

  • Michael Masters
    Michael Masters Jul 12, 2009

    Sure, you can purchase this relay at your local auto zone parts store or, you can special order it from the nearest Mitsubishi dealer as well. If the engine light came on, it would be wise to scan the memory of the CPU to pull any stored codes. the malfunctioning relay may have damaged one or, more of the on board sensors that are on the engine.

  • Michael Masters
    Michael Masters Jul 12, 2009

    NOTE***(When the new relay is fitted, if you should notice the same issue with this new relay, this will confirm MFI Control Unit failuer(ECU/PCM/ECC). replace the used MFI control unit,AKA(ECU) with a new unit.

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