CR-V LX 2WD L4-1972cc 2.0L DOHC MFI (1998)
Low Fuel Lamp/Indicator: Description and Operation
How the Circuit Works
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's temperature increases, 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 the thermistor, the thermistor's temperature increases. 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.
