1997 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Fuel Pump Resistance

CAUTION: Fuel pump and fuel sending unit are separate components. Fuel pump is accessible through vehicle interior, but fuel pump connector is accessible through luggage compartment (near fuel sending unit).

Remove trim cover from behind rear seat in luggage compartment. Disconnect 2-pin fuel pump connector (NOT the sending unit connector). Measure resistance between female terminals of fuel pump connector. Replace fuel pump if resistance is not 0.2-3.0 ohms at 68Β°F (20Β°C).

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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