Low Fuel Lamp/Indicator: Description and Operation
Fuel Gauge and Low Fuel IndicatorWARNING: Do not smoke while working on the fuel system. Keep open flame away from the work area. Drain fuel only into an approved container.
The fuel gauge (part of the LCD Display) and the low fuel indicators are controlled by the CPU in the gauge assembly. The fuel gauge sending unit (part of the fuel tank unit) sends a fuel level signal to the CPU in the gauge assembly through the YEL/BLK wire (cavity A3). The signal varies depending on the position of the float in the fuel tank which changes the resistance of the sending unit. The sending unit's resistance varies according to the position of its float.
The CPU controls the LCD Display to turn on the correct number of segments to indicate the fuel level. When the fuel level drops below the LOW level, the CPU grounds the low fuel indicator, which turns the indicator on.
Refer to the Fuel Supply System for specific tests or troubleshooting procedures.