1992 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Normal Mode

  1. Normal mode is used for routine testing of vehicle. To read diagnostic codes, ensure battery voltage is at least 11 volts, throttle valve is fully closed, transaxle/transmission is in Neutral and all accessories are off.
  2. Total Diagnostic Communication Link (TDCL) connector is located under left side of instrument panel. See Fig 1. Diagnostic codes can be obtained through TDCL connector or check connector. On ES300, check connector is located in engine compartment near right shock tower. Check connector is located near top front of engine. See Fig 2.
  3. Turn ignition on. DO NOT start engine. Using a jumper wire, connect terminals E1 and TE1 together either on TDCL connector or check connector. See Fig 3. Count number of flashes from CHECK ENGINE light.
    Fig 1: Locating TDCL Connector
    G90H18884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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:

  • • 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.

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