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Old 09-18-2017, 08:46 AM   #1
AMK222
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2000 SC
Happy Question- Secondary Air Injection

Hello! This is my first post so please forgive me if this gets asked a lot!

I keep failing my emissions, as when I first looked into getting the secondary air injection system fixed, they told me if wasn't made anymore and they would have to look deeper...First, what is the secondary air injection system? Also, if I were to search for it myself, how do I go about doing it? I have a 2000 Saturn S...it's been so wonderful to have it, I don't want to get a new car and have car payments, but at the same time, I don't want to go get my emissions monthly!

Thanks for your advice

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Old 09-18-2017, 09:12 AM   #2
Claybury
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Default Re: Question- Secondary Air Injection

Hi AMK222.
Is your car a SC1 or SC2? How many miles are on it? Do you know what code numbers were reported when the vehicle was scanned?
The secondary air injection parts are available so the car should be able to be fixed. Offhand I would also wonder if a O2 sensor may be a problem. Here is a description of how the system works:

The AIR system is used to reduce hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOX) exhaust emissions by heating up the catalytic converters quicker on cold engine start-up. The conversion of exhaust emissions to carbon dioxide (CO2) and water can occur sooner as the catalytic converter reach the normal operating temperature around 527C (981F). The AIR system consists of:

Air pump (1)
Check valve (2)
Air pump solenoid (3)
Combination valve (4)
Air pipe and hose (5)
Vacuum hose (6)
Air pump relay - located in underhood fuse block (UHFB). (7)
Powertrain control module (PCM) - located underhood between the battery and power brake booster. (8)
The air pump is a permanently lubricated turbine type pump which requires no periodic maintenance. The PCM runs the air pump for a certain length of time when the engine is started within a certain ECT range. When the air pump is commanded ON, the PCM will command an internal driver ON which pulls the air pump relay circuit to ground allowing current to flow to the air pump.

The air pump solenoid is used to control vacuum to the combination valve. When the air pump relay is commanded ON, air pump running), the PCM will wait a short amount of time to command the air pump solenoid ON. The PCM turns the solenoid ON by controlling an internal driver that pulls the solenoid circuit to ground. The PCM waits to turn the solenoid ON in order for the air pump to pressurize which keeps exhaust gas from entering the air pump.

When the air pump and air pump solenoid are turned ON, vacuum to the combination valve will allow the spring loaded diaphragm, upper valve in the combination valve, to be pulled up. This will allow pressurized air from the air pump to flow around the reed valve, lower valve in combination valve, to the exhaust manifold.

Before the PCM commands the air pump relay OFF, it will first command the air pump solenoid OFF and wait a short amount of time before it commands the relay OFF. This keeps exhaust gas from entering the air pump.

...
2002 SC2 1.9L
2007 Vue 3.5L
1985 Fiero SE 3.1L
1974 Triumph Spitfire 3.1L V6
2002 Ram duelly diesel 5.9L
1975 Honda PA50 0.05L (Swarm and destroy)

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Old 09-18-2017, 09:50 AM   #3
AMK222
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2000 SC
Default Re: Question- Secondary Air Injection

Quote:
Originally Posted by Claybury View Post
Hi AMK222.
Is your car a SC1 or SC2? How many miles are on it? Do you know what code numbers were reported when the vehicle was scanned?
The secondary air injection parts are available so the car should be able to be fixed. Offhand I would also wonder if a O2 sensor may be a problem. Here is a description of how the system works:

The AIR system is used to reduce hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOX) exhaust emissions by heating up the catalytic converters quicker on cold engine start-up. The conversion of exhaust emissions to carbon dioxide (CO2) and water can occur sooner as the catalytic converter reach the normal operating temperature around 527C (981F). The AIR system consists of:

Air pump (1)
Check valve (2)
Air pump solenoid (3)
Combination valve (4)
Air pipe and hose (5)
Vacuum hose (6)
Air pump relay - located in underhood fuse block (UHFB). (7)
Powertrain control module (PCM) - located underhood between the battery and power brake booster. (8)
The air pump is a permanently lubricated turbine type pump which requires no periodic maintenance. The PCM runs the air pump for a certain length of time when the engine is started within a certain ECT range. When the air pump is commanded ON, the PCM will command an internal driver ON which pulls the air pump relay circuit to ground allowing current to flow to the air pump.

The air pump solenoid is used to control vacuum to the combination valve. When the air pump relay is commanded ON, air pump running), the PCM will wait a short amount of time to command the air pump solenoid ON. The PCM turns the solenoid ON by controlling an internal driver that pulls the solenoid circuit to ground. The PCM waits to turn the solenoid ON in order for the air pump to pressurize which keeps exhaust gas from entering the air pump.

When the air pump and air pump solenoid are turned ON, vacuum to the combination valve will allow the spring loaded diaphragm, upper valve in the combination valve, to be pulled up. This will allow pressurized air from the air pump to flow around the reed valve, lower valve in combination valve, to the exhaust manifold.

Before the PCM commands the air pump relay OFF, it will first command the air pump solenoid OFF and wait a short amount of time before it commands the relay OFF. This keeps exhaust gas from entering the air pump.
Thank you so much for your reply, I will read through it- but just to give you a quick answer I have 117000 miles on it, and the code number was P0410, and I think I have an SC1 if that tells you anything...Thank you again!

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Old 09-18-2017, 09:55 AM   #4
BV22
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2002 SC1
Default Re: Question- Secondary Air Injection

There is a Saturnfans member named Richpin who has a bunch of videos on YouTube, including one on how to diagnose the secondary air injection system. It is actually a rather simple system, but there are multiple failure points, and it is best to find out where the problem lies rather than just replacing parts. The video will help you or your mechanic, if you lack the confidence to try to do the work yourself.

...
BV22
2002 SC1 5M
298k 10/17

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Old 09-18-2017, 10:28 AM   #5
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Default Re: Question- Secondary Air Injection

Richpin diagnostic video: https://www.youtube.com/watch?v=dIrmkxj6wJE

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Old 09-18-2017, 10:37 AM   #6
Waiex191
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1999 SL2
Default Re: Question- Secondary Air Injection

I fixed my P410 code. Check out this picture:
http://www.saturnfans.com/forums/att...6&d=1500862664

The little tube that goes from the diverter valve to the exhaust manifold was completely plogged with carbon. Pull that off and clean it out - 4 bolts and a couple of gaskets. Also, look at the top row of exhaust manifold nuts. There is a bulge in the manifold under the nuts which is a passage from left to right. The tube gets air to the manifold, the passage gets the air to all exhaust ports. Pop off your manifold and clean out that carbon. For both the tube and manifold, no magic spray was going to clean them out. I scraped the manifold passage with a screwdriver and wire brush.

Here is the one picture of my manifold where you can see that passage.

http://www.saturnfans.com/forums/att...2&d=1500846610

...
Bryan Cotton
'99 SL2, owned since new
5 speed manual
Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!

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