How to Reset the Check Engine Light in Toyota Cars

by Contributing Writer

Resetting the check-engine light on your Toyota car needs to be done after you've finished fixing your Toyota car. The check-engine light only comes on when there is a problem with the vehicle's emissions system or other system components of your Toyota car. Replacement parts can normally be purchased at any auto-parts store. To reset the check-engine light, you can use a special tool, also available from any auto-parts store, called an onboard diagnostic scan (OBD) tool. This tool is the only tool capable of reading the trouble codes and then clearing the Toyota car trouble codes by connecting directly to the computer.

Under The Hood:

 How to Reset the Check Engine Light in a 2001 Toyota Tundra

Open the hood of your Tundra.

Locate the black, negative terminal of the battery marked with a "-" sign.

Use a pair of pliers to unhook the negative battery cable by removing the nut that holds the cable in place.

Wait five minutes for the truck's computer to fully shut down and be ready for a hard restart.

Reconnect the negative battery cable to the negative terminal and secure it with the nut.

Start your Tundra and verify that the light is off.

Items you will need

  • Pliers

 How to Reset the Check Engine Light on a 1993 Toyota

Locate the fuse panel cover on the driver's side dashboard. Pull down on the cover with your fingers to open it.

Examine the diagram on the back of the fuse panel cover and find the location of ECU fuse.

Use the fuse pullers within the fuse panel to remove the ECU fuse.

Put the key into the ignition and turn it to the "On" position, but don't start the engine.

Wait about five minutes, then replace the fuse. The Check Engine light will blink a few times then shut off for good.

Turn off the vehicle and replace the fuse pullers. Close the fuse panel cover.

Items you will need

  • Ignition key

 How to Reset the Check Engine Light on a Toyota Camry 1999

Pull down on the fuse panel cover in the driver's side foot well with your fingers.

Locate the fuse for the electronic control unit, or ECU.

Pull the fuse for the ECU using the fuse pullers that are mounted in the fuse panel.

Turn the ignition key to the second position in the ignition, but don't crank the engine (it won't start anyway with the ECU fuse removed).

Wait at least 3 minutes before putting the fuse back into the fuse panel. The check engine light will blink and then shut off. Your check engine light and computer will be reset at this point.

 How to Reset the Check Engine Light on a Toyota Tacoma

Locate the diagnostic link connector (DLC) in the Toyota Tacoma. It is under the driver's side dashboard between the steering column and the dash. The shape of the connector will match the trapezoidal shape of the plug connection on the OBD II scan tool.

Attach the plug of the OBD II scan tool to the DLC of the Tacoma. Make sure it is plugged in thoroughly.

Place the ignition key into the Tacoma and turn it two clicks to activate the "key-on/engine-off" mode. This mode illuminates the dash and activates the power to the electrical options in the truck without actually starting the engine. It will also provide power to the scan tool from an accessory fuse powered by the battery.

Read the screen of the OBD II scan tool. There are many different kinds with slightly different options, but overall, they function similarly. Scroll buttons and "enter" or "select" keys will help you navigate through the several features the scan tool offers. It is recommended to "read codes" first before resetting, unless you have already made the necessary repair that triggered the check engine light.

Scroll to the "reset" or "erase code" option once the code(s) have been documented, if applicable. Press the "enter"or "select" button to confirm you want to erase the code(s). A few seconds will pass and the OBD II scanner will alert you that the command is being sent to the ECM of the Tacoma. Once the main menu of the scan tool reappears, the check engine light is reset. Be aware that hard codes and even minor codes can and will re-trigger the check engine light if not rectified. Hard codes may re-trigger immediately or may have to endure the IM monitor reset of the ECM. This may take several driving cycles to occur.

Check the status of the check engine light by unplugging the scan tool and then starting the Tacoma. The check engine light should not be illuminated as long as a hard code is not re-triggering the faulty device.

Items you will need

  • OBD II scan tool

 How to Reset the Check Engine Light in a Toyota Corolla

Find the Diagnostic Link Connector (DLC) on the lower left side of the dashboard on the driver's side of the car. You can find it near the hood release.

Plug an OBD II scanner into this port and put the key in the ignition. Turn the key forward about two clicks, taking care not to start the engine. This will power the scanner.

Scroll through the menu on the scanner using the arrow keys until you find the command that says "Erase Codes." Press "Enter." (Some scanners have a separate "Erase" button that you can press instead.) Wait for the main menu to appear or until you see the message on the scanner that says "Command Sent."

Unplug the OBD II scanner and start the vehicle. Look at the instrument panel to make sure the check engine light has turned off.

Items you will need

  • OBD II scanner

  • Ignition key

 How to Reset the Check Engine Light on a 2001 Toyota Camry

Examine the underside of the driver’s side of the vehicle to locate the OBD-II port. The OBD-II port will be a small electrical connector that is roughly 3 inches wide.

Plug the OBD-II scanner into the OBD port on the vehicle.

Turn the Camry ignition to the run position, but do not start it.

Follow the prompts on the scanner to read the codes.

Select the “Erase Codes” function on the OBD-II scanner.

Unplug the scanner after it has prompted you that the function is completed.

Start the vehicle and allow it to run for a few minutes to ensure that the check engine light has been erased.

Items you will need

  • OBD-II Scanner

 How to Reset the Check Engine Light on a 2000 4Runner

Turn the vehicle key to the "Off" position to make sure the 4Runner is completely off.

Locate the data link connector. On the 2000 4Runner, the data link connector is located just under the dashboard in the driver side area, to the right of the steering column.

Connect the OBD II reader connector to the data link connector. If the OBD II reader is self-powered, turn it on after making this connection.

Turn the key to the "On" position, but do not start the 4Runner.

Follow the OBD II reader's instructions to erase existing error codes. Different scanners will have different methods of doing this, from pressing an "Erase Codes" button to going through menu options to do so. This step will reset the system diagnostic controller.

Disconnect the OBD II reader from the data link connector once the reader has indicated that it is through erasing codes.

Start the 4Runner to verify the check engine light is no longer lit. If it is still lit, repeat the above steps. If it stays lit after repeating the steps, this could indicate a problem with the system diagnostic controller.

Items you will need

  • OBD II reader

 How to Reset the Check Engine Light on a 1997 Toyota Corolla

Open the fuse panel by pulling down on the fuse-panel cover with your fingers.

Locate the rectangular onboard diagnostic input to the left of the fuse panel.

Connect the OBD scan tool plug to the OBD input.

Turn the ignition on but don't start the engine.

Press the reset button on your OBD scan tool and wait for the check-engine light on the dash to blink and then shut off.

Items you will need

  • OBD scan tool

 How to Reset the Engine Light in the 2000 Toyota Corolla

Pull the hood latch release, near the bottom of the driver side door. Lift open the hood and place the hood prop under the hood to support it.

Unscrew the negative battery cable from the battery terminal with a wrench. After loosening the bolt on the battery cable terminal, lift the cable from the battery post and position it so it is not touching any part of the post. The negative battery cable is the black cable. Wait 10 minutes for the computer to reset.

Attach the negative battery cable to the battery terminal with a wrench.

Remove the hood prop from the underside of the hood and close the hood.

Start the vehicle in a well-ventilated area. Let it run for 10 minutes in park at idle. This will allow the computer to learn the proper idling rpm.

Items you will need

  • Wrench set

 How to Reset the Engine Light on a 1999 Toyota Sienna

Remove the negative battery cable by turning the attached bolt until it is loose enough to remove. Slide a non-conductive object between the battery and the cable, such as a newspaper, book or magazine. This prevents the cable from possibly coming back into contact with the battery.

Turn the ignition on for a few seconds, then turn it back off and remove the key. Nothing will happen since the battery is disconnected, but this action depletes any excess energy from the electrical system, allowing the computer to reset faster.

Reverse the previous steps to reconnect the battery cable. Confirm the bolt has been securely tightened before closing the hood.

Start the engine and allow the Sienna to idle for at least 2 minutes before driving. The engine light will no longer illuminate. If it comes back on, then the problem that triggered the light has not been resolved and additional repairs are in order.

Items you will need

  • Wrench set

  • Newspaper, book or magazine

 How to Reset the Engine Light on a Toyota Camry

Locate the fuse panel cover under the steering column. Pull down on it with your fingers to remove it.

Examine the diagram on the fuse panel cover and find the electronic control unit fuse.

Remove the fuse puller from inside the fuse panel and use it to pull the fuse out for the electronic control unit.

Put the key into the ignition and turn on the car but don't turn over the engine. Wait a few minutes then put the fuse back in place. You should notice the check engine light blinking a few times on the instrument panel, then it will go off.

Turn off the engine and replace the fuse panel cover.

Items you will need

  • Ignition key