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Thread: Any help with diagnosis? P2009 and P0090 on my 03

  1. #1
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    Any help with diagnosis? P2009 and P0090 on my 03

    I'm hoping for some guidance on where to go from here. I've got 147k on my 03 Protégé5, and a month or two ago I started getting these same 2 codes. Always both, never one at a time. P2009 is Fuel Pressure Regulator 1 Control Circuit and P0090 is Intake Manifold Runner Control Circuit Low Bank 1. Here's the run down of symptoms I've been having.

    The past day or two it's had a rough cold start. It'll shake just a bit and give me high rpms but if I give it a few seconds it'll calm down and drive fine.

    Occasionally if I hit the gas my engine will stutter and buck like it's going to stall. When I first noticed it I was afraid it was something with my transmission but it happens in every gear and I think it's more likely that it could be fuel starvation.

    If I'm idling I'll occasionally feel a stutter in the engine, maybe a misfire but I don't get a code for a misfire when it happens. Almost feels like a compressor kicking on.Sometimes it won't happen at all, sometimes it'll happen every 10-20 seconds. I don't notice it at all if I'm driving.

    I haven't had any loss in fuel effeciency that I've noticed. I've only had the car for a handful of months but I'm getting around 31.5mpg on average on my daily commute per the Bluetooth OBD2 scanner I use in addition to the Torque Pro app.

    I flushed my Coolant last week and I noticed an electronic click noise coming from the engine bay, every minute or two it seemed, just one click that sounded like maybe a short. I couldn't find the source of the noise but it seemed like it was coming from the passenger side, closer to the firewall.

    This may be related in part to the performance issues I've been having but I don't think it's the cause for the CEL, but the rubber tube coupler holding the aftermarket cold air intake is old and cracking. I've bought 2 replacements so far buy neither of them fit, the CAI was on the car when I bought it so I don't know the exact specs.

    I really hope you guys have a clue on where to go from here short of testing every piece of wiring I can find.

  2. #2
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    There is no code P2009 for our car.
    The equivalent code is code #P1250.



    You've probably got a bad PRC (pressure regulator control) valve.

    We don't have a code P0090 either... I forget whether or not the "Intake Runner" refers to the VICS or the VTCS (but there is no "circuit low" code for the VICS)

    You've probably got a bad VTCS solenoid valve. (which could throw the other code too ??)



    These are the VICS and VTCS solenoid valves.





    I'd start with the VTCS solenoid valve,.. they have been known to fail.

    If the VTCS valve is malfunctioning, it could lead to stumbling of the engine and most of the symptoms you've described.
    The Diagram Dude

  3. #3
    The Diagram Dude pcb's Avatar

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    Here's a link to the free download of the factory service manual.

    http://www.floptical.net/mazda/
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    Thanks for the nudge in the right direction! I'll check those first. I'd read it could be anything from bad wiring to a dying fuel pump, but if the VTCS solenoid has been known to fail then hopefully that's all it is, especially if you think it could be throwing the other code too. In fact that might make sense, because the codes always come and go in pairs, never appearing solo.
    I'm not 100% sure but I think it refers to the VICS, the green plug, which looks like it's working okay but I guess it's what's on the inside that counts. I tried a "quick fix" I'd heard about where I manually wiggle the rod on the actuator to clear out any gunk that might be gumming up the butterfly valve. I thought it had worked because I felt like it was running smooth and the CEL stayed off until a day or two later when it came back in full force, stutters and all.

  5. #5
    The Diagram Dude pcb's Avatar

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    Quote Originally Posted by heitktebinltraj View Post
    ,... if the VTCS solenoid has been known to fail then hopefully that's all it is, especially if you think it could be throwing the other code too...
    I'm just guessing there,... It could be the other way around ??


    Quote Originally Posted by heitktebinltraj View Post
    .. I tried a "quick fix" I'd heard about where I manually wiggle the rod on the actuator to clear out any gunk that might be gumming up the butterfly valve...
    It could still be a mechanical issue and the ECU responds with a code.
    Check your actuator and see if it operates smoothly.
    Check your vacuum lines running to it and make sure they aren't cracked/leaking.

    A vacuum leak might cause the actuator to not move and it could throw a code
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  6. #6
    The Diagram Dude pcb's Avatar

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  7. #7
    The Diagram Dude pcb's Avatar

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    I would suspect that the ECU only responds to electrical issues with the solenoid valves and not "know" whether or not the actuator actuated or not further down the line.
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  8. #8
    The Diagram Dude pcb's Avatar

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    Quote Originally Posted by heitktebinltraj View Post
    ,... I'd read it could be anything from bad wiring to a dying fuel pump,...
    The fuel pressure regulator solenoid valve controls the fuel pressure up and down. (things like needing more fuel pressure to restart a hot engine).

    If the fuel pump is going bad it may not deliver the proper pressure under all circumstances.

    But start with the the solenoid valve.
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    Finally found the time to look things over. The vacuum gauge I rented from AutoZone didn't come with any connectors, go figure. So for now I switched the VICS and VTCS solenoids. I'm hoping to see a VICS CEL pop up as opposed to the VTCS one I've been getting, if this is just a faulty solenoid switch I'll be ecstatic. I let it idle for a couple minutes warmed up and no codes yet. It was probably in my head but I wasn't getting any of the hiccups I'd been feeling at idle before. Guess I'll just have to wait and see.

  10. #10
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    Just went for a quick spin, no CEL yet but I'm still getting a "stutter" when I give it a lot of gas. I'm getting a new tube coupler for my CAI tomorrow, and now that I think about it spark plug wires and coils might be a good idea. I got a code for a cylinder 3 misfire the other day that went away pretty quick, I assumed it was related to the problems I'd been having but it might be that I'm overdue for a wire change. So I'll do that bit of maintenence and see if it makes a difference.

  11. #11
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    Alright, CEL came back on with no change. So I think that rules out the solenoid being bad. It also had a random misfire code with it this time I hate surprises. I guess it's time to look at the PRC valve. If it's going out then I'm probably running lean which would definitely explain the misfires. I have no idea where to start for the PRC so it looks like I have some reading to do

  12. #12
    The Diagram Dude pcb's Avatar

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    I threw the code for the PRC about a year ago.
    I removed the solenoid and applied 12V to the terminals.
    It clicked twice then stopped clicking.
    I swapped the solenoid with the one from my parts car and that fixed it. I almost forgot about that,.. I got the code then swapped solenoids all in about fifteen minutes.
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