1999 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

ECM Relearn

CAUTION: DO NOT exceed engine speeds or time durations listed.

Start engine and allow to reach operating temperature. Press A/C button to turn climate control system off. Apply parking brake. Apply brakes and shift transmission to DRIVE. Allow engine to idle for 2 minutes. Gradually raise engine speed to 950 RPM and hold for 45 seconds. Raise engine speed to 1200 RPM and hold for 45 seconds. Raise engine speed to 1500 RPM and hold for 30 seconds. Allow engine to return to idle. Place shifter in PARK. Turn engine off.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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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