Low Fuel Warning Light Sensor Operational Test (RAV4, Sienna, Tacoma With Tachometer, T100 & 4Runner)
- Remove fuel sending unit from gas tank. Using a jumper wire, connect negative battery terminal to fuel sending unit terminal No. 3. See Figure-Figure . Using another jumper wire, connect a 12-volt, 3.4-watt test light between positive battery terminal and fuel sending unit terminal No. 1.
- With sending unit float/sensor dry, test light should come on in about 40 seconds. With sending unit float/sensor submerged in gasoline or water, test light should turn off. If test light does not function as specified, replace fuel gauge sending unit.