How To Replace Toyota Corolla Alternator & Serpentine Belt (2009-2013)

Introduction

This tutorial will guide you through the process of replacing the alternator and serpentine belt in a 2009-2013 Toyota Corolla. The steps outlined here apply to the 1.8L engine model and are also relevant for the 2009-2010 Toyota Matrix and Pontiac Vibe. Whether you're a seasoned DIYer or a novice, this guide provides clear instructions to help you complete the task efficiently.

Step 1: Gather Necessary Tools and Parts

Before starting the replacement process, ensure you have the following tools and parts ready:

Tools Needed

• Socket set
• Pry bar
• Torque screwdriver set
• O2 sensor removal tool (if applicable)
• Mechanic's creeper (optional for comfort)

Parts Needed

• New alternator
• New serpentine belt

You can find these parts online, such as on Amazon, with links provided in the video description.

Step 2: Prepare the Vehicle

To safely work on your vehicle, follow these steps:

1. Disconnect the Battery

   • Open the hood and locate the battery.
   • Use a wrench to disconnect the negative terminal to prevent any electrical shock.

2. Lift the Vehicle

   • If necessary, use a jack to lift the front of the vehicle and secure it with jack stands for safety.

Step 3: Remove the Serpentine Belt

The serpentine belt drives various engine components. To remove it:

1. Locate the Tensioner

   • Identify the serpentine belt tensioner, which is typically a pulley.

2. Release Tension

   • Use a socket or wrench to turn the tensioner counterclockwise. This will loosen the belt.

3. Remove the Belt

   • Slide the belt off the pulleys and set it aside.

Step 4: Remove the Alternator

Now, it's time to take out the old alternator:

1. Disconnect Electrical Connectors

   • Locate the electrical connectors on the alternator and unplug them.

2. Remove Mounting Bolts

   • Use a socket to remove the bolts securing the alternator to the engine.

3. Take Out the Alternator

   • Carefully lift the alternator out of its bracket.

Step 5: Install the New Alternator

With the old alternator removed, follow these steps to install the new one:

1. Position the New Alternator

   • Place the new alternator into the mounting bracket.

2. Secure with Bolts

   • Replace and tighten the mounting bolts to secure the alternator in place.

3. Reconnect Electrical Connectors

   • Plug the electrical connectors back into the new alternator.

Step 6: Install the New Serpentine Belt

With the new alternator in place, you can now install the new serpentine belt:

1. Route the Belt

   • Refer to the belt routing diagram, usually found on a sticker in the engine bay, to ensure proper installation.

2. Tension the Belt

   • Use the tensioner to apply tension to the belt, ensuring it is properly seated on all pulleys.

Step 7: Reconnect the Battery and Test

Finally, reconnect the battery and perform a test:

1. Reconnect Battery

   • Attach the negative terminal back to the battery and tighten it securely.

2. Start the Engine

   • Start your vehicle and listen for any unusual noises. Check that the alternator light on the dashboard is off.

3. Inspect the Installation

   • Visually inspect the belt and alternator for proper installation.

Conclusion

You have successfully replaced the alternator and serpentine belt in your Toyota Corolla. Regular maintenance of these components is crucial for the vehicle's performance. If you encounter issues, consider consulting a professional mechanic for further assistance. Happy driving!