Integra Type R Coupe L4-1797cc 1.8L DOHC (VTEC) MFI (2001)
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Low Fuel Lamp/Indicator: Description and Operation
How the Circuit Works
WARNING: Do not smoke while working on the fuel system. Keep open flame away from the work area. Drain fuel only into an approved
container.
A thermistor is mounted in the fuel tank unit. When the thermistor is cool, its resistance is very high. When the thermistor is warm, its resistance
decreases. Fuel in the fuel tank transfers heat away from the thermistor fast enough to keep it cool so the thermistor's resistance stays high and the low
fuel indicator light does not come on. When the fuel level drops below about 2.2 gallons, the thermistor is no longer immersed in fuel. Without the fuel
to cool it, the thermistor's resistance decreases, allowing current to flow through the low fuel indicator light and the thermistor to ground, and the low
fuel indicator light comes on.
