Dorman 911-622 Secondary Air Injection Check Valve

1. Product Overview

The Dorman 911-622 Secondary Air Injection Check Valve is a direct replacement component designed to match the fit and function of the original valve in specified Toyota vehicles. This valve is crucial for the proper operation of your vehicle's secondary air injection system, which helps reduce emissions by pumping fresh air into the exhaust stream during cold starts.

This component is engineered for durability and reliable performance, restoring the functionality of your vehicle's emission control system after the original valve fails.

Image 1.1: The Dorman 911-622 Secondary Air Injection Check Valve. This image shows the complete valve assembly with its metal body and electrical connector.

2. Product Features

• Direct Replacement: Engineered to precisely match the fit and function of the original equipment (OE) valve on compatible vehicles.
• Restores Functionality: Designed to fully restore the secondary air injection system's operation, addressing issues caused by a failed original valve.
• Durable Construction: Manufactured from quality materials to ensure reliable performance and extended service life under various operating conditions.
• Quality Assurance: Backed by Dorman's team of product experts and over a century of automotive experience, ensuring trustworthy quality.

3. Vehicle Compatibility

This Dorman 911-622 Secondary Air Injection Check Valve is compatible with select Toyota models. Please verify fitment for your specific vehicle using the model number and OEM part numbers provided.

Compatible Vehicles:

• Toyota Sequoia: 2008, 2009
• Toyota Tundra: 2007, 2008, 2009

Always confirm compatibility with your vehicle's make, model, and year before purchasing and installing any replacement part.

4. What's in the Box

Upon opening the package, you should find the following components:

• 1 x Dorman 911-622 Secondary Air Injection Check Valve
• 1 x Gasket
• 1 x Secondary Mounting Bracket

Inspect all components for any signs of damage before proceeding with installation.

5. Setup and Installation

Installation of the Dorman 911-622 Secondary Air Injection Check Valve requires mechanical knowledge and appropriate tools. If you are not confident in performing this installation yourself, it is highly recommended to seek assistance from a qualified automotive technician.

General Installation Guidelines:

1. Safety First: Ensure the vehicle is turned off, cooled down, and properly supported on a level surface. Disconnect the negative terminal of the battery to prevent electrical hazards.
2. Locate the Existing Valve: Identify the location of the secondary air injection check valve on your vehicle. Refer to your vehicle's service manual for exact positioning.
3. Remove Old Valve: Carefully disconnect any electrical connectors, vacuum lines, and mounting hardware from the old valve. Remove the old valve and gasket.
4. Clean Mounting Surface: Clean the mounting surface thoroughly to ensure a proper seal with the new gasket.
5. Install New Valve: Position the new gasket and the Dorman 911-622 valve. Secure it with the provided mounting bracket and hardware. Reconnect all electrical connectors and vacuum lines.
6. Final Checks: Double-check all connections and ensure everything is securely fastened. Reconnect the battery.
7. Test System: Start the vehicle and check for any warning lights or unusual operation. It may be necessary to clear any stored diagnostic trouble codes (DTCs) using an OBD-II scanner.

Always consult your vehicle's specific service manual for detailed, step-by-step instructions and torque specifications.

6. Operation

The secondary air injection check valve is a critical component of your vehicle's emissions control system. Its primary function is to prevent exhaust gases from flowing back into the secondary air injection pump. During cold starts, the secondary air pump forces fresh air into the exhaust manifold to help rapidly heat the catalytic converter, reducing harmful emissions.

The check valve ensures that this airflow is unidirectional, protecting the air pump from hot exhaust gases and preventing damage. A properly functioning check valve contributes to efficient emissions control and can prevent the illumination of the "Check Engine" light related to the secondary air injection system.

7. Maintenance

The Dorman 911-622 Secondary Air Injection Check Valve is designed for long-term reliability and typically does not require routine maintenance. However, regular vehicle inspections can help identify potential issues early.

Maintenance Tips:

• Visual Inspection: Periodically inspect the valve and surrounding hoses/connections for any signs of cracks, leaks, or damage.
• System Checks: If your vehicle's "Check Engine" light illuminates, have the secondary air injection system diagnosed by a professional. A faulty check valve can often trigger related diagnostic trouble codes.
• Preventative Measures: Ensure other components of the secondary air injection system, such as the air pump and relays, are functioning correctly to avoid premature failure of the check valve.

8. Troubleshooting

If you experience issues after installing the Dorman 911-622 Secondary Air Injection Check Valve, consider the following troubleshooting steps:

If troubleshooting steps do not resolve the issue, consult a certified mechanic for further diagnosis.

9. Specifications

10. Warranty and Support

For specific warranty information regarding your Dorman 911-622 Secondary Air Injection Check Valve, please refer to the warranty documentation included with your purchase or visit the official Dorman website. Dorman products are known for their quality and are backed by a commitment to customer satisfaction.

Customer Support:

If you have any questions about installation, compatibility, or product performance, please contact Dorman customer support. You can typically find contact information on the Dorman website or through your product retailer.

For additional resources and product information, visit the Dorman Store on Amazon.