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Code 43

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    #1

    Code 43

    My ECU only reads code 43 when the car is at regular temperature, but my fuel pump comes on like normal. If the fuel pump is faulty, shouldnt code 43 come up as soon as i turn the car on?
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    #2
    Depends on what Code 43 really is, and when it is polled.
    2003 Maxima SE Titanium Edition
    Polished Titanium ext, heated black leather int, heated leather steering wheel, HIDs, 255bhp, 6 speed, 15% tint.
    1993 Suzuki GSX1100F 136bhp

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      #3
      Code 43 is the Fuel supply System. I reset the ecu and still it only comes up when the car is warm.

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        #4
        Originally posted by Juicy_J
        Code 43 is the Fuel supply System. I reset the ecu and still it only comes up when the car is warm.
        Then the ECU is only checking when warm.
        How old is your filter?
        2003 Maxima SE Titanium Edition
        Polished Titanium ext, heated black leather int, heated leather steering wheel, HIDs, 255bhp, 6 speed, 15% tint.
        1993 Suzuki GSX1100F 136bhp

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          #5
          Whats cool is most of the time this code can be solved via changing the o2 sensor. Why? I dont know lol.

          The New-ish Ride
          My old Ride
          Hear my Vtak!!!
          MK3 Member #3
          I piss off people for fun.
          IA 08 Sunburn Victim #1

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            #6
            The Fuel Filter is only a couple thousand miles old (2000-3000). I was thinking of changing it, and i know its going to be a pain in the azz doing it because of its position, but i didnt consider that to be a problem. Ill try that though.

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              #7
              From ALLDATA: Check engine light indicates Code 43: Most likely a problem with the oxygen (O2) sensor circuit or a problem in the fuel supply system.

              My opinion: If the CEL comes up only when the engine is warm, it is very likely that there is a problem with the oxygen sensor (circuit) since the ECU will enter closed loop mode after a preset period of time. At that point, it will poll the oxygen sensor, and if the data from the oxygen sensor is erratic or unavailable, the ECU may throw code 43.

              "The fault-finder will find faults even in paradise. Love your life, poor as it is. You may perhaps have some pleasant, thrilling, glorious hours, even in a poorhouse."-Henry David Thoreau

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                #8
                Originally posted by IAmTheNight
                From ALLDATA: Check engine light indicates Code 43: Most likely a problem with the oxygen (O2) sensor circuit or a problem in the fuel supply system.

                My opinion: If the CEL comes up only when the engine is warm, it is very likely that there is a problem with the oxygen sensor (circuit) since the ECU will enter closed loop mode after a preset period of time. At that point, it will poll the oxygen sensor, and if the data from the oxygen sensor is erratic or unavailable, the ECU may throw code 43.
                hear, hear, I agree

                on the stairs, she grabs my arm, says whats up,
                where you been, is something wrong?
                i try to just smile, and say everything’s fine.

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