5VZ ECU self learns quite well, especially latter models which had the TRD kit optioned.
You can speed up the ECU's self learn process by resetting it, You can either do this with the OBD tool or disconnect the battery overnight with headlights on. You then want to reconnect and start the engine in neutral without touching the throttle, allow the engine to idle till it reaches operating temp then shut it down. The ECU should now adjust for the higher octane fuel.
You can speed up the ECU's self learn process by resetting it, You can either do this with the OBD tool or disconnect the battery overnight with headlights on. You then want to reconnect and start the engine in neutral without touching the throttle, allow the engine to idle till it reaches operating temp then shut it down. The ECU should now adjust for the higher octane fuel.
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