Apex showing code 20 running rich, rough idle

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Well last week it I was out driving and it started backfiring and flashing the check engine with a code 14 and ocaisionally a code 20 which was a pressure leak at upper pressure sensor and a atmospheric sensor reading wrong barometric pressure... so I pulled the throttle bodies off and chenged the vaccume lines. Cleared the codes and now the code 14 is gone but the 20 still remains ...I tested both pressure sensors the one by the ecu and the one on the fuel rail as well as the airbox sensor in the airbox and all three are reading about 3.5 volts. Which is well below the 4.7 to 5 volt threashold

 

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My question is the sled went from running perfect to running terrible I doubt all three sensors could be bad what would cause the low voltage reading? Would it a bad ground or ecu

 

[Macheater]

What year Apex?

 

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It's a 2006 with 14,000 kms on it

 

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My Atmospheric Pressure sensor is saying 98 in the diagnostic mode and my intake pressure sensor says 99

 

[snobill]

....

 

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It was in the sled in 2015 when I purchased it ...it reads 12.3 volts with the key off 11.8 v with the key on

 

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Anyone else have any information

 

[Macheater]

Seems like a lot of older Apex's have been having electrical gremlins lately. Check your grounds for corrosion or looseness. Sounds like the atmos pressure sensor may be going or has gotten wet. I'm not sure how you arrived at those sensor voltages but chances are they very between 0-5 volts. So your values may or may not be in range.

 

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I tested the voltage between the center wire which from what I read and the black and blue wire and it's reading no higher then 3.5 volts I cleaned all the grounding blocks as well I took both pressure sensors out as well as the air temp sensor and brought them inside by the woodstove for a couple days ..fingers crossed this fixes it

 

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Does anyone have a wire diagram that shows all the ground locations? I found 6 ground blocks in the harness but I feel like there is probably more

 

[thor452]

is there a power commander or anything like it on the sled?
when I had the Supercharger on mine I got code 20 and had to disconnect it to reset the code.

 

[anything fast]

Ya I have a pc5 on it I did unplug it as soon as this all started i havent had it running in a couple days but my fingers are crossed it won't come back on

 

[thor452]

if it wires into the sensors on the rail you have to disconnect them and start the sled for codes to clear then shut down and reconnect it and it may then work.