Forget the Mechanic: Reset Your Lexus ECU at Home with the ANCEL TD700

    ANCEL TD700

    The engine control unit in your Lexus manages and monitors the engine's performance. It stores diagnostic trouble codes that signal malfunctions, allowing for later repair. Additionally, the ECU stores data about your driving habits to tailor the vehicle's responses to your style. For new or reset ECUs, the adaptation process occurs during the first 1,000 miles of driving, during which the car adjusts to the driver’s typical behaviors—shifting gears earlier for conservative drivers and holding gears longer for those with a more aggressive foot. Will it be hard to reset the ECU? It's actually very simple and you can easily do it with just a car scanner.

    Why Reset the ECU?

    Resetting the Engine Control Unit can offer numerous benefits for a vehicle, serving as a critical step in maintaining its optimal performance. The ECU is the brain of a vehicle, responsible for controlling the engine's functioning and ensuring efficient performance based on the inputs it receives from the vehicle's sensor. 

    Refreshing the Vehicle's System

    Over time, your vehicle learns and adapts to your driving style, thanks to the ECU. If your driving habits change significantly—perhaps due to changing driving conditions or if a different person starts driving the vehicle—a reset can help the ECU adjust to these new patterns faster.

    After major repairs or routine maintenance such as changing the air filter or installing a new exhaust system, resetting the ECU can help recalibrate the system. This ensures that the ECU can accurately assess the state of mechanical changes and adjust the engine settings accordingly to maintain optimal performance.

    Related Reading: Can I Change Ecu Without Programming?

    Incorporating Aftermarket Enhancements

    Installing aftermarket parts like a more efficient air intake system, a new turbocharger, or performance exhaust can significantly alter the engine's characteristics. A reset ensures that the ECU recognizes these changes and adjusts its control strategies, which might include fuel mixture, ignition timing, and boost pressure.

    Without resetting the ECU, the full potential of aftermarket upgrades may not be realized because the ECU continues to operate based on its previous configurations which may not be optimal for the new modifications.

    General System Check

    Resetting the ECU can clear out any old error codes that are no longer relevant after repairs or adjustments have been made. Regular resets can help maintain the long-term health of the vehicle by ensuring that the ECU always operates with the most current and relevant data, thus avoiding inefficiencies or potential damage caused by running under sub-optimal conditions.

    Step-by-Step Guide to Resetting Your Lexus

    Resetting the ECU can help re-tailor the car to your liking. There are a few different ways to reset the ECU.

    Option 1: Disconnect the Battery

    Preparation: Understand that this method will clear all personalized settings including radio presets, seat positions, and navigation preferences, which will require reconfiguration.

    Execution: Disconnect the negative battery cable to sever the power supply to the ECU, leaving it off for about two to three minutes to ensure a full reset.

    Reconnection: Reattach the negative battery cable, which might necessitate a re-setup of various vehicle presets due to the loss of stored memory.

    Option 2: Pull EFI and ETCS Fuses

    Locate the Fuse Box: Positioned under the hood on the passenger side near the strut tower, the fuse box houses critical electrical circuit protectors.

    Removal of Fuses: Utilizing the diagram inside the fuse box cover as a guide, extract the EFI and ETCS fuses with your fuse puller or pliers.

    Wait: Allow a stand time of two to three minutes with the fuses removed to enable a full discharge of any residual power in the circuits.

    Reinstall the Fuses: Carefully replace the fuses in their designated slots, ensuring they are securely and correctly positioned.

    Option 3: Using a Programmer

    Programmer Setup: Equipments such as the OBD2 car scanner can streamline the ECU reset process, offering a direct and often simpler reset option via onboard diagnostic ports.

    Consult Manual: It’s imperative to adhere to the device-specific instructions detailed in the programmer’s manual to ensure a successful reset without risking damage to the vehicle’s electronic systems.
    Car Scanner | ANCEL
    ANCEL TD700 OBD2 All System Diagnostic Scan Tool for Toyota/Lexus/Scion TPMS ABS Transmission

    You Need This Best Car Diagnostic Tool

    The ANCEL TD700 emerges as a pivotal tool in the realm of vehicle diagnostics, providing a broad spectrum of functions tailored to enhance the maintenance and performance of modern vehicles, including Lexus models from 1996 to 2021.

    Key Features of ANCEL TD700

    • Professional Maintenance Diagnostic Tool: The ANCEL TD700 stands out with its ability to perform critical maintenance tasks such as oil light service resets, EPB resets, TPMS resets, battery registration, ABS bleeding, SAS reset, throttle release, battery voltage tests, BMS reset, DPF rebuilding, and new nozzle code programming.

    • Advanced All System Diagnosis: It supports full-mode OBDII functions and system-specific diagnostics, including engine systems, power transmission, airbag systems, ABS systems, battery matching systems, TPMS systems, steering angle sensor systems, A/C systems, and more.
    • Full OBDII Modes for All Vehicles: This device ensures comprehensive diagnostics with capabilities like reading and deleting codes, displaying I/M readiness status, reading live data, viewing freeze frame data, performing onboard diagnostic examination tests, and more.

    Resetting Your Lexus ECU with ANCEL TD700


    Locate the OBD-II Port: Find the OBD-II port in your Lexus, typically located beneath the dashboard near the steering column.

    Connect the ANCEL TD700: Plug the device into the OBD-II port. Ensure the connection is secure to prevent data disruption.


    Power Up: Turn on the ANCEL TD700 and allow it to initialize. This may take a few moments as the device establishes communication with your vehicle's ECU.

    Vehicle Selection: Select your vehicle make, model, and year from the device’s menu to ensure the correct protocols are used during the diagnostic process.

    ECU Reset Process

    Navigate to ECU Reset: Use the device’s interface to navigate to the 'ECU Reset' or equivalent section.

    Perform the Reset: Follow the on-screen instructions to initiate the ECU reset. The ANCEL TD700 will interact with your vehicle’s ECU to reset it, which may include clearing fault codes and resetting operational settings to factory defaults.


    Restart the Vehicle: Once the reset process is complete, turn off your vehicle for a few minutes, then start the engine again. This allows the ECU to reinitialize with the reset settings.

    Check for Errors: Observe the dashboard for any warning lights. Use the ANCEL TD700 to scan for any residual or new error codes. If any issues persist, additional diagnostics or manual resets may be required.

    Final Checks and Tips

    After resetting your ECU, take your Lexus for a short drive to ensure everything is operating smoothly. Pay attention to the vehicle’s response and performance, particularly how the transmission and engine respond during acceleration and idling.


    Resetting the ECU is a simple yet effective way to enhance your driving experience by recalibrating the vehicle's systems to better align with current driving conditions or changes. Choose the method that best suits your comfort and tool availability. Remember to handle all electronic components with care to avoid damage or unintended resets.

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