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Old 09-24-2020, 10:07 PM   #5
Scooby Newbie
Member#: 487372
Join Date: Jun 2018
Location: Des Plaines, IL
2013 WRX Hatch


Originally Posted by enclosedflame56 View Post
Completely understandable. Have you tried jumping the pins and seeing if you can give the pump power to see if it turns on? It should be a 12-volt system, so just jump the harness with some leads and see if you can get anything to turn on (don't run it for a super long amount of time, just enough to see if it will turn on).

Have you checked to see if you're receiving power at the pump through the harness?
Yes, that is the first thing that I had tried. The pump definitely works.

I used a multimeter to see if there was a voltage source at the input terminals of the air pump while the vehicle was on but I did not see any voltage. I'm assuming because the ECU already ran the air pump at the first cold start then cut power to the pump with the relay. I will try it again tomorrow on a cold start and see if I can read a voltage.
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