What is the function of the secondary air injection system monitor?
Secondary AIR System Monitor. When vehicles are equipped, the secondary AIR system monitor allows the PCM to ensure that extra air is being delivered to the exhaust system during cold engine operating conditions. The monitor usually runs on the start up of a cold engine, conditions permitting.
How does a secondary air injection pump work?
A secondary air injection pump is a part of the automobile exhaust system. It reduces harmful exhaust emissions at the time of a cold start phase. How does this pump actually work and how can you troubleshoot if it shows warning signs of going bad?
When was secondary air injection introduced in cars?
(October 2015) ( Learn how and when to remove this template message) Secondary air injection (commonly known as air injection) is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller secondary combustion of exhaust gases.
What are the symptoms of a bad air injection pump?
One of the early symptoms of a bad secondary air injection pump is the Check Engine warning light turning on. The engine control unit can automatically detect when the secondary air injection pump has a problem.
How does an aspirated air injection system work?
Aspirated air injection. Air injection can also be achieved by taking advantage of the negative pressure pulses in the exhaust system at engine idle. A sensitive reed valve assembly called the aspirator valve is placed in the air injection pumping, which draws its air directly from the clean side of the air filter.
Why do you need a secondary air injection pump?
The secondary air injection pump (also referred to as a smog pump or SAI pump) is responsible for lowering the number of carbon emissions that come out of the tailpipe of a vehicle. This is necessary since a vehicle engine is never 100% efficient in the combustion process.
One of the early symptoms of a bad secondary air injection pump is the Check Engine warning light turning on. The engine control unit can automatically detect when the secondary air injection pump has a problem.
Why do we need an air injection system?
All we have to do is introduce some oxygen, than any unburned fuel will ignite. So, the air injection smog pump pushes air into the exhaust system, right after the exhaust manifold. Therefore, helping intercept and burn those unburned fuels. Above all, the system is critical to help engines achieve government emissions standards.
Where does the air injection smog pump go?
Consequently, inside the exhaust manifold, there is sufficient heat, to support combustion. All we have to do is introduce some oxygen, than any unburned fuel will ignite. So, the air injection smog pump pushes air into the exhaust system, right after the exhaust manifold.