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Home >> Toyota >> 2003 >> Highlander Base, 3.0 F, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self Diagnostics - V6 >> Self-Diagnostic System >> Clearing Diagnostic Trouble Codes

Clearing Diagnostic Trouble Codes

NOTE: If the hand-held tester switches the ECM from the normal mode to the check mode or vice-versa, or if the ignition switch is turned from ON to ACC or OFF during the check mode, the DTCs and freeze frame data will be erased.

The DTCs and freeze frame data will be erased by either action:

  1. Operating the OBD II scan tool (complying with SAE J1978) or the hand-held tester to erase the codes. See OBD II scan tool instruction book for operating instructions.
  2. Disconnecting the battery terminals or EFI fuse (20-amp) located in the engine room junction block. However, other memory functions (clock, radio, alarm, seats, etc.) will be cleared and must be reset.
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