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Old 06-26-2018, 11:30 PM   #1
Mustard
Scooby Newbie
 
Member#: 57984
Join Date: Mar 2004
Chapter/Region: W. Canada
Location: Edmonton, AB, Canada
Vehicle:
2007 STi LTD
SWP

Default CEL Code P2431 and Secondary Pump Removal

My Secondary Airpump valve(s) died.

I decided that it was too big a job to pull them out at the time, and because I had an AccessPort installed, I got a tuner to build me a map that ignored the Airpump codes instead.

Since then, however, I get a CEL (code P2431 - Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range Performance) every once in a while.
The car is unaffected- performance wise- so I didn't really care much.

Now, though, I'm prepping the car for sale, and I'd like to solve the issue once and for all for whoever the new owner is.

The code points to being something wrong with the barometric pressure sensor, which I gather is located in the LH Secondary Air Pump Valve.
Doing some logging seems to confirm this because the reading never gets above 11-13 PSI running or not, and I gather it's supposed to get to 21 PSI.

So my question is, if I remove the pump, the valves, all the piping, etc and put in the block-off plates, what will happen to this code?
The sensor will be gone, right? What will the ECU be interpreting for Barometric Pressure then?
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Last edited by Mustard; 06-27-2018 at 02:58 AM.
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Old 06-27-2018, 10:52 AM   #2
thewolfe
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Member#: 427424
Join Date: Aug 2015
Location: Portland, OR
Vehicle:
2014 wrx hatch
black

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You still need the barometric sensor when you do an air pump delete. Cut the sensor out, tape it up and plug into the harness. Sounds like yours may be bad though.
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Old 06-27-2018, 12:45 PM   #3
Mustard
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Member#: 57984
Join Date: Mar 2004
Chapter/Region: W. Canada
Location: Edmonton, AB, Canada
Vehicle:
2007 STi LTD
SWP

Default

Ah, so it's not removed in the delete, then?

I guess I'll have to source out just a sensor as well, thanks.
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