How Do You Test A Secondary Air Injection Valve

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How to Test a Secondary Air Injection Valve

Introduction

A secondary air injection valve (SAIV) is a component of the emissions control system in many modern vehicles. It helps to reduce emissions by injecting air into the exhaust system, which helps to burn off unburned fuel and reduce the formation of harmful pollutants.

Symptoms of a Faulty SAIV

There are several symptoms that may indicate a faulty SAIV, including:

  • Check engine light illuminated
  • Rough idling
  • Poor fuel economy
  • Increased emissions
  • Unusual exhaust odor

Testing a SAIV

1. Visual Inspection

Begin by visually inspecting the SAIV for any signs of damage or leaks. Look for loose or disconnected hoses, cracks in the valve body, and any other abnormalities.

2. Electrical Test

  • Using a multimeter, set to the ohms setting, measure the resistance across the SAIV’s terminals. A good SAIV should have a resistance of less than 1 ohm.
  • With the engine running, use a voltmeter to measure the voltage across the SAIV’s terminals. A good SAIV should have a voltage of around 12 volts.

3. Pressure Test

  • Connect a pressure gauge to the SAIV’s inlet hose.
  • Start the engine and let it idle.
  • The pressure gauge should read between 10 and 20 psi (pounds per square inch). If the pressure is significantly lower or higher, the SAIV may be faulty.

4. Vacuum Test

  • Connect a vacuum gauge to the SAIV’s outlet hose.
  • Start the engine and let it idle.
  • The vacuum gauge should read between 5 and 10 inches of mercury. If the vacuum is significantly lower or higher, the SAIV may be faulty.

Replacement

If the SAIV is found to be faulty, it will need to be replaced. The replacement procedure is relatively simple and can be performed by most do-it-yourselfers with basic tools.

Once the new SAIV is installed, it is important to clear the engine’s fault codes and reset the adaptive fuel trim values. This can be done using a code reader or by following the manufacturer’s specific instructions.

Conclusion

Testing a secondary air injection valve is a relatively simple procedure that can help to identify and diagnose problems with the emissions control system. By following these steps, you can ensure that your vehicle is operating efficiently and meeting emissions standards.

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