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1999 Saturn SL2 P0410 2nd Air Inj Syst Malf...

CantFixCrap CantFixCrap
New User | Posts: 2 | Joined: 11/10
Posted: 11/29/10
11:40 PM

Had an issue with hard/rough start, no cooling temp reading on gauge ect... Diag/ replaced CTS/ECT sensor... after that fired up and issues were corrected but tripped athe P0410 code...

???? Cleared the code and will do a drive cycle tomorrow AM when its not to damn cold outside.... ANyone have an idea why it triped the 2nd air inj sys mal code???? Confused  

jgate-#002 jgate-#002
Guru | Posts: 953 | Joined: 06/07
Posted: 11/30/10
08:29 AM

The P0410 code should not have anything to do with the coolant sensor. P0410 means the air pump system is not working. The are pump should run for a short time after cold engine start. You should be able to here the pump when it is running. If the pump does not run, check fuses and relays, make sure you have power and ground to the pump during the time it should be on. If you hear the pump run then check for proper air flow out of the pump and through the check valves.
The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.

About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water ,which occurs naturally in the exhaust, back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.

There is a technical service bulletin,regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose. The TSB can be found on the ACDelco site.
Additionally, if you simply replace the AIR pump the problem may return again.
If you replace the pump, also clean out the hoses and replace the one-way check valve. in a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.
Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid.  

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