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Fuel Temperature Sensor (Code 41)

WARNING: This page is about a different car, the 1985 Nissan 200SX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect 20-pin connector and measure the resistance between terminal 15 and ground. See Figure . When fuel temperature is below 68°F (20°C), resistance should be above 2100 ohms. When above 68°F (20°C), resistance should be below 2900 ohms.
  2. If resistance readings are okay, replace ECCS control unit. If not okay, check harness for continuity and repair if necessary. If harness is okay, measure resistance of fuel temperature sensor.
    SENSOR TEMPERATURE/RESISTANCE RELATIONSHIP SPECIFICATIONS

    Temperaturev °F (°C) Ohms
    14°F (10°C) 7000-11400
    68°F (20°C) 2100-2900
    122°F (50°C) 680-1000
    176°F (80°C) 260-390
    212°F (100°C) 180-200
  3. If resistance readings are okay, replace ECCS control unit. If no good, replace fuel temperature sensor and pressure regulator as an assembly.
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