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Old 08-05-2018, 07:24 PM   #1
6spd68
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Join Date: Jan 2015
Posts: 14
Default Secondary air injection system

Hello everyone! I need some help diagnosing my secondary air system. I just replaced the air pump and noticed that I have back pressure out of it after the system shuts off. I have vacuum going to the switch and going to the diverter valve during warm-up and when the air pump shuts down I still have vacuum going to the diverter valve. I also noticed that I have about 14.4 volts at the switch during the 30 second warm-up and when the air pump shuts down the voltage drops to 4.3 volts.

Why do I have voltage after the system shuts down? It seems like I should just replace the switch but I would like to be sure before I just throw money at it. I measured the ohms and it was about 44. When I disconnect the vacuum line going to the diverter valve it closes and I get no back pressure. Also, I have seen the richpin video, that's how I got this far

Thanks in advance, this forum is the best!

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