Toyota Celica, Corolla, ECHO & MR2 1999-05

Reading & Clearing Codes


Clearing Codes

After repair of the circuit, the diagnostic code(s) must be removed from the ECM memory. With the ignition turned OFF , remove the 15 amp EFI fuse for 30 seconds or more. Once the time period has been observed, reinstall the fuse and check for normal code output.

Click image to see an enlarged view

Fig. Removing the EFI fuse will clear the trouble codes retained in the ECM

If the diagnostic code is not erased, it will be retained by the ECM and appear along with a new code in event of future trouble.

Cancellation of the trouble code can also be accomplished by disconnecting the negative battery cable. However, disconnecting the battery cable will erase the other memory systems including the clock and radio settings. If this method is used, always reset these components once the trouble code has been erased.

  1. Using a jumper wire, connect terminals Tc and E1 of the DLC1 and remove the short pin.
  3. Turn the ignition switch to the ON position.
  5. Depress the brake pedal 8 or more times within three seconds.
  7. Cheek that the warning light shows a normal code.
  9. Remove the jumper wire and connect the short pin.

Cancellation can also be done by removing the ECU-B fuse, but in this case, other memory systems will be canceled out.