Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1997 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Fuel Level Warning Light System
- Disconnect fuel gauge sending unit connector. Connect a jumper wire between terminals No. 1 and 3 at fuel gauge sending unit connector. For fuel gauge sending unit connector identification, see Figure.
- If fuel level warning light illuminates, go to next step. If warning light does not illuminate, check bulb. If bulb is okay, check wiring harness. See appropriate wiring diagram in WIRING DIAGRAMS .
- Remove fuel gauge sending unit. Apply battery voltage between terminals No. 1 (+) and 3 (-) of fuel gauge sending unit connector (sending unit side of connector). See Fig 1.
- Connect a 3.4-watt test light between battery positive terminal and sending unit connector. Test light should come on after a few moments. Submerge entire sending unit (or fuel level sensor portion) in a container of fuel. Test light should go out. If operation is not as specified, replace sending unit.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.