Persistent DTCs/Rampant limp mode

Discussion in 'Mazdaspeed 3 Troubleshooting' started by Tyler Young, Jul 31, 2020.

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  1. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    So since my last post i have bought a computer, downloaded free VT and logged data from the last 2 days. Below are screenshots of an example or 2 of what I've been dealing with along with a few descriptions.

    first half is idle, then a short drive across the parking lot. This is what my pcm looks like in limp mode
    RED-intake manifold PSI
    BLUE-boost PSI
    GREEN-MAP voltage
    PURPLE-wastegate duty cycle

    Just prior to this log I was stuck in Kroger parking lot for about an hour because p0069 MAP/BARO correlation, p0245 wastegate solenoid low would come up every time I cleared my codes
     

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    Last edited by a moderator: Sep 12, 2020 at 4:21 PM
  2. andale927

    andale927 Silver Member

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    Not too familiar with this problem, but might want to log intake manifold pressure and barometric pressure in VT with the key on and engine off. This is the only time manifold pressure and barometric pressure would be expected to correlate, so log the condition.

    The P0245 is pretty clear cut, it means continuity is lost to the solenoid. It could be an intermittent wiring/connector issue, a failed solenoid, or bad PCM (very unlikely).
     
  3. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    -FAULTSTART-BARO_MAP_IM-PSI.png LIGHT BLUE-ambient baro
    DARK BLUE-MAP voltage
    RED-intake manifold PSI
    This was taken the other day at idle after it started in limp mode. Only difference is when I cleared the codes it started back up correctly on the next try...

    The baro reading is kinda throwing me off though. Granted it doesn't fluctuate more than .2 but, in my mind the ambient baro should stay constant so long as I'm not changing altitude or anything... idk
     
    Last edited by a moderator: Sep 12, 2020 at 4:20 PM
  4. andale927

    andale927 Silver Member

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    You need to log with the key on and the engine off, and attach the .csv please.
     
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  5. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    Ok so I couldn't get it to fault but this is .csv as a positive start (sample)

    This is an example of a good idle and some rev (test)

    example of ignition (halfoff)

    On another note. What are y'all using to view .csv? sorry, new computer so I'm still downloading software
     

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    Last edited by a moderator: Sep 12, 2020 at 4:24 PM
  6. andale927

    andale927 Silver Member

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    I just use excel and freeze the top row to view .csv files.

    The barometric pressure jumping around is normal, the sensor just has very low resolution.

    There is something wrong with your MAP sensor. I think the issue might be a bad MAP calibration or the MAP is bad. The PO may have unloaded the tune and left a modified map sensor on, you should check the part number.

    There is likely a flag that sets the DTC when the difference between barometric pressure and IM absolute pressure is different by more than a certain amount with KOEO.

    In your "test idle rev" log, the MAP sensor is pegged at an absolute pressure of 9.5 which does not make sense, it should drop closer to 4 to 6 psi (absolute) at idle. (either that or you have a huge vacuum leak)

    The purpose of the flag is likely just a safety check, since the baro pressure and abs pressure are used to calculate the boost pressure. You can probably get rid of the limp mode by disabling p0069 in versatune. DO NOT go into boost if you do this, there is a reason it triggers limp mode. If your MAP sensor calibration is bad then the boost targeting will not know what is doing.

    Edit:
    Try sticking to a single thread when you are trying to get help. It makes it much easier for others to follow the problem.

    I guarantee the problem is your tune after reading your other thread. The PO had a CS 3.5 bar sensor, you replaced it with another 3.5 bar sensor. The sensor isn't reading correctly because the PO uninstalled the tune before selling the car. Now that you have Versatune you can fix this by entering the MAP sensor scalar values to an OEM map and flashing the car.

    Scalar A = 210
    Scalar B = 0.35
    Offset = 4.26

    Post a consolidated list of the mods you've found on the car, it will help us see if you need any other corrections to the tune.
     
    Last edited: Aug 2, 2020
  7. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    dude this is great. ok so what i've discovered so far.
    Threadstone TR8 FMIC
    TurboSmart BOV(VTA)
    CS 3.5 BAR MAP
    Radium PCV baffle plate "limp dick" hose that i assume use to be connected to an OCC
    ported intake manifold with PCV plugged/ VTCS delete
    EGR delete
    EMUSA k0422 turbocharger with stock downpipe
    HTP 3" CAI turbo inlet with AEM filter
    i suspect that the fuel pump internals have been swapped A. because there is a ziptie around the bottom metal line that leads to the rail and B. on other data logs i have registered up on the high end of 1900 psi. C. i'm throwing codes for system too rich(thankfully not lean) and with the 3" inlet if the internals were stock it should be lean.. right? as for everything else, i believe it's stock. but as i have only had this thing for about a year now, i'm just stumbling onto all this stuff.

    here's the tricky part though. when i replaced the MAP i replaced it with the same spec that was existing. the vaccum leak i did have went away for a period of about a month and then came back.. my dash shows that i have a leak but in my data logs it shows i'm operating under the correct amount of vaccum. based off the limp mode logs makes me think it's more of an electrical fault coupled with a stock tune on aftermarket parts.. i mean the wiring harness is half covered in electrical tape so PO reworked it some. what do you think?
     
    Last edited by a moderator: Sep 12, 2020 at 4:21 PM
  8. andale927

    andale927 Silver Member

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    God thats a mess lol. IDK how you've been driving the car like this for a year...

    If the intake is larger than stock then you would expect to throw a lean code without a tune because the MAF calibration will be off. Make sure you have the OEM MAF sensor installed. There are differently calibrated MAF sensors for Mazda L engines depending on if the engine is turbocharged or not and the parts stores don't know or care which one they sell you.

    Everything is pretty suspect. There's no way you'll get anywhere with diagnosis without having sensors that are reading correctly.

    IMO you just need a customized OTS basemap from Freektune for the 3" intake and MAP sensor just to continue diagnosing. Either that or pickup the full version of versatuner so you can make corrections.


    In the meantime you can gather more data to see how far off everything really is. Log these parameters in versatune:
    upload_2020-8-3_22-22-42.png

    upload_2020-8-3_22-22-47.png
    Get an idle log, slow 2nd gear acceleration from 2k to 6k rpm (no boost), and maybe a part throttle boost log. Also a WOT log if you have been doing WOT on the map thats already on the car.

    You can't tell whether or not you have the HPFP internals without taking them out.
     
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  9. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    so wot studders after about 60% throttle so i try to stay outta that honestly. I've done a few pulls but it scares the hell outta me cuz it feels like a timing issue at that point(i dont think my timings off but just feels like that at wot) as far as logs I'll see what I've got so far and upload some csv
     
  10. andale927

    andale927 Silver Member

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    I wouldn't call -4.8 psi the correct amount of vacuum, unless you have more logs to share.
    upload_2020-8-3_22-26-7.png

    I don't think its an electrical issue.
     
  11. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    is it not? to be honest man, I'm new to all this tuning stuff. I've always worked on older less tech reliant cars. but I'm no quitter and i love this car

    but no, around -5 is pretty consistent
     
    Last edited by a moderator: Sep 12, 2020 at 4:21 PM
  12. andale927

    andale927 Silver Member

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    Idle vacuum should be around -8.5 to - 11 PSI.
     
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  13. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    oh.. well damn
     
  14. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    you ready for some weird shit?..

    idle

    2nd gear low accel top at 6k

    I've got a 4th gear WOT log but VT support needs to get back to me bc i wasn't able to view it

    none of those logs were taken in limp mode..
     

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    Last edited by a moderator: Sep 12, 2020 at 4:19 PM
  15. Easter Bunny

    Easter Bunny Professional Engineer Platinum Member

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    You need to do the following now before you hurt the motor.
    Confirm that the correct MAF sensor is installed
    Confirm that you have upgraded fuel pump internals
    Install a base tune that is calibrated for the 3" intake and upgraded map sensor
     
    Easter Bunny, via a mobile device, Aug 5, 2020
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  16. Tyler Young

    Tyler Young Trying' to fix this damn thing... Greenie Member

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    ok, so I think it's about time for an update. I have confirmed that I have AutoTech HPFP internals, I have not, until about an hour ago, modified the scalars and multipliers... leading me to believe that the tune is the main issue. Haven't had a chance to flash it yet though
     
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