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About Flying_W

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  • Location
    Spokane, Wa
  • Vehicles
    '98 Legacy GT
  1. 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