Hi my ECU light came on today. I have checked the error log on the car.
Any ideas how to check this easily and quickly?




P0410 SUBARU - Secondary Air Injection System Malfunction


Possible causes
- Faulty Vacuum hoses damaged
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
- Air bypass solenoid leaking/blocked or stuck open/closed
- Air diverter valve leaking/blocked or stuck open/closed

When is the code detected?
The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation

P0410 SUBARU Description
An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

 

Engine hesitation Will only be present at cold start & idle for short period , cel code engaged if any part of the system fails , most common failure is overheated pump £1000 to replace
Secondly servo stuck open/closed
Your car will run ok so don't worry
The propper solution is to junk the whole system fit cosworth blanking plates to the heads & remove cel codes ( job done ) there is a temporary DIY way by blanking the pump outlet , myself & a few others have contributed to a thread on here explaining how to go down this route If you wish to , search secondary air pump

Regards

 

Hmmm, I have AA warranty, looks like I best check the T&C's to see if it covers air pumps etc

 

Do some research on prices if you are wanting to remain stock & replace the pump
I have a pump with less than 10k on it
Make me an offer if you get stuck

Regards