Fuel Receiver Gauge Malfunction: Description

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

The meter CPU uses the fuel sender gauge assembly to determine the level of the fuel in the fuel tank The resistance of the fuel sender gauge will vary between approximately 15 Ω with the float at the full position, and 410 Ω. with the float at the empty position. The meter outputs battery voltage through two 820 Ω resistors that are mounted in parallel inside the meter CPU. The meter CPU measures the voltage between the variable resistor in the fuel sender gauge and the two resistors mounted in parallel in the meter. Voltage measured at this point will vary as the float of the fuel sender gauge is moved. The highest voltage observed should be approximately half of the battery voltage.

HINT.

The fuel level warning light will come on when the fuel level is below 11.0 liters (2.9 gallons).