1984 Toyota 4Runner BaseFACTORY OEM SERVICE PROCEDURE

Clearing Trouble Codes

After any repairs are performed, clear ECU memory of all stored trouble codes. To clear memory, turn ignition off and remove appropriate fuse from fuse panel for 30 seconds. Cancellation can also be done by removing the battery negative terminal, but in this case other memory systems (radio, clock, etc.) will also be canceled out. See Figure.

Fig 1: Clearing Trouble Codes from ECU Memory
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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.