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Map/Baro Solenoid Air/Vacuum Sources?

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Old 08-20-2010, 04:20 PM   #1
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Map/Baro Solenoid Air/Vacuum Sources?

Hey all

I was wondering if you guys could help figure out where/what source of air goes to the lines of the Map/baro solenoid. I also have another solenoid that was running along the Vacuum Gallery that looks exactly like the Map/baro solenoid (not the EVAP solenoid).

Here is the picture...
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K5T46581 7924 : Map/baro Solenoid


K5T46583 7923: Another Map/baro Solenoid????I'm not sure?They look the same...


A: ?
B: to boost solenoid (IIRC)
C: ?
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Old 08-20-2010, 05:26 PM   #2
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Im only asking because I didn't understand this picture...I also couldn't find where/how the other solenoid was hooked up/whats its purpose.

Click the image to open in full size.
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Old 08-20-2010, 06:57 PM   #3
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I should also add I did removed the vacuum gallery, to clean up the bay a little (hoses were disconnected/cut a while back). So I want to hook back both solenoids (minus the EVAP solenoid). Something tells me ill be shooting in the dark on this one...
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Old 08-20-2010, 07:05 PM   #4
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One is vac, one is abso press, one is breather/openair?
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Old 08-20-2010, 07:14 PM   #5
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Does it matter which is which? I also have another one that's identical but it sits in the middle of the vacuum gallery (has green connector) the Map/Baro has a brown connector.
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Old 08-20-2010, 07:16 PM   #6
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I'll check in the morning if you can wait.
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Old 08-20-2010, 07:31 PM   #7
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I'll wait. Was going to try it tonight but since it hasn't been plugged in for like half the summer I don't really care. Just trying to clean up/ remove the engine lights. Thanks Kevlo
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Old 08-21-2010, 09:43 AM   #8
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A and C connect to the metal hoses, Im not sure which is the vac and where they both go.

http://www.nicoclub.com/FSM/maxima/1997/EC.pdf
EC10 has the main diagram, just follow the lines. Might be easier to take in paint and color the lines

But to me it looks like A goes to filtered air source and C goes to vac
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Old 08-21-2010, 06:07 PM   #9
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Thanks Kevlo, its a little more detailed then what I had...Still gonna be plug and pray
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Old 08-22-2010, 03:01 PM   #10
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Click the image to open in full size.

c= in - barometric air source from intake box/tubing
b= out - goes to absolute pressure sensor.
a= in - needs vacuum source (UIM)
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Old 08-22-2010, 07:11 PM   #11
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THANKS!!!!

Earlier this morning I tried both with vacuum, no Map/Baro Code. Then did as you said no Map/Baro code. Inew the 2 vacuum sources wasn't right...just wanted to see what would happen.

Thanks again to the both of you!
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Old 08-22-2010, 09:06 PM   #12
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Late to the party but here are all 3:

Going by your A,B,C; A is the single metal nipple, B is the middle plastic nipple, C is the last nipple.

Green solenoid controls EGR.
A- Vacuum from intake manifold
B- Back pressure transducer, AKA EGR valve
C- Fresh air source, from intake resonator

Brown solenoid controls Boost/MAP sensor.
A- Vacuum
B- Boost sensor
C- Fresh air source

Black solenoid control EVAP.
A- Fresh air source
B- Vacuum source with check valve
C- Evap canister purge control valve, AKA little black disc on intake manifold

The vacuum gallery is the most over engineered pile of metal spaghetti in the world. Its way confusing and overly complicated. I removed all of it years ago and mounted all 3 solenoids and boost sensor to a metal bracket near the ABS actuator.
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Old 08-22-2010, 09:42 PM   #13
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Thank you very much...You have saved me so many headaches...
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Old 09-12-2010, 03:58 PM   #14
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Map/Baro sensor

I think I may have a similar issue with my map/baro sensor. I started having a stalling issue only when coming to a stop. Acted like it was starving for fuel. Here's the list of things I replaced: IACV, fuel pump, TPS, Cam PS. Took TB off and thoroughly cleaned it. (Thanks Pohmr for great right up). Can I test map/baro like most sensors? As long as I'm getting X volts then it's good? It's starting to stutter and try and stall even under acceleration. Only happens when engine up to normal temp. Doesn't happen every time it's driven. I'm at the end of my rope. Any ideas?
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Old 06-28-2012, 03:51 PM   #15
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how does the fresh air source thing work? where do you get the fresh source from?
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Old 06-28-2012, 08:31 PM   #16
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Either leave it open to the air or connect it to the mid pipe.
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07 Frontier SE CC 4x4 ... Daily driver.
98 Maxima SE 00VI VLSD ... 14.9 @ 95 (I/Y/B). Never ending project.
94 Sentra SE-R ... 1/8: 8.2 @ 94, 2.1 60' 356whp/322wtq. After 3 passes, on hiatus.
91 Sentra SE-R ... 1/8: 8.6@ 86, 1/4: 13.1 @ 110, 2.2 60' 250whp. After 7 passes, totalled.
03 Altima 3.5 SE ... Hers.

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Old 06-29-2012, 11:34 AM   #17
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so when you say vacuum you mean a hose directly off the manifold not the airbox/intake? the reason why i am askin all these questions is because i am currently fixing all vacuum lines and i just want to make sure its right the time. and after a lot of research this is probably the most helpful info i've come by.
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