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    ternitup's Avatar
    ternitup Posts: 3, Reputation: 1
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    #1

    Jun 27, 2008, 06:55 AM
    Civic MIL code 43
    I have a 1995 Civic that is getting a MIL Code 43 from time to time when I drive it. I have found that it stand for Fuel System Malfunction, but I can't find any information on what to check to get it fixed. Does anybody know of anything I can check the get it fixed?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Jun 27, 2008, 08:05 AM
    It's either a problem in the Heated Oxygen Sensor circuit or a problem in the Fuel Supply System.
    ternitup's Avatar
    ternitup Posts: 3, Reputation: 1
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    #3

    Jun 27, 2008, 08:57 AM
    Does the fuel supply system mean the fuel pump?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Jun 27, 2008, 10:24 AM
    What is your car experiencing? That will tell you whether to focus on the oxygen sensor, PGM-FI main relay, fuel pump, fuel injectors, fuel filter, or fuel pressure regulator.
    ternitup's Avatar
    ternitup Posts: 3, Reputation: 1
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    #5

    Jun 27, 2008, 03:59 PM
    The car doesn't seem to change at all when the check engine light comes on. It might idle a little better but that is about the only difference I have noticed. A little background: Its actually a 2000 civic si with an obd1 ecu so that I could use a piggyback computer (hondata s200) to tune the car. It has been fully built and has 750cc injectors rather than the stock 245cc and I have upgraded the fuel pump to a 255 lph. I have a custom exhaust that I welded an O2 sesor in the side rather than the top so the wires for the O2 are sretched tight but all are still in tact. I assumed if the O2 was the problem I would be getting a code for the O2 sensor rather than the fuel supply system. I had never seen a code 43 and its no longer listed in the OBD2, so it confused me.
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