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Flying_W

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Everything posted by Flying_W

  1. P0183 Fuel temperature sensor A circuit high input

    Flying_W replied to akafriday's topic in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX
    After spending a lot of time looking at the thermometer in the tank, it occurred to me that if it were an ecu input, it should be 5v or less. I found a diagram of the ECU pinout, and there is a pin #25 labeled for fuel temp sensor. Backprobed it and found 4.99v. Tried a 1k resistor to ground, and it pulled voltage to 2.13. ECU bought it immediately. Removed resistor, and P0183 returned. Put resistor back in, and code cleared and stayed clear. There must be another sensor somewhere, but the thermistor is for low fuel light only. I'll post a diagram shortly. MSA5TCD97L3907-ECU-TCU.pdf

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