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Thread: Turbo charger stepper curcuit

  1. #1

    Turbo charger stepper curcuit

    Did a little research through the forum about this didn't get any good info (only if you own a hiace with a d4d). A couple of weeks ago I did a trip in the mid north coast it was fantastic it was the waterfall way between bellagen and armidale.while coming back from a museum owned by russell crowe enjoying the drive and the power of the new roo system the check engine light came on and pradi derated in engine power so I pulled into dirt track idled pradi down and disconnected the module thinking that may be causing the issue.Got going again and all good beside check engine light still on.After about 2 hrs it went out.It did the same thing again the next day.I made some inquires with toyota.With new info I cleared the code and unpluged stepper curcuit plug's and cleaned them.So far all good no more problems but if it happen's again or constantly I may need to replace turbo.Has this happened to any other pradopointers and what was wors't case cenario.
    Last edited by pradi2; 28-07-2012 at 10:16 PM.
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  2. #2
    Avid PP Poster! matt150's Avatar
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    Sounds like another name for an electronically controlled DC motor, that controls the variable vane of the turbocharger. When they mentioned if it keeps happening you may have more issues ect, they were correct. If the engine ECU detected issues with the angle of the motor and the vanes inside the turbo, it would derate the engine (limp mode, no boost). I am not 100% on this, but either the stepper set up controls he vane angles or it's a electronic boost waste gate or, as I think it is a part of both parts of the turbo.

    I will look further on the net and post what I can find.
    Matt
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    Addicted PP Member MidLifeCrisis's Avatar
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    Do you know the code it showed? If you have a scan gauge or any reader that plugs into the OBD port you an see when it happens. I had 2 x code 1251 which relate to the turbo stepper I believe. Bloody annoying and I did NOT have my chip plugged in at the time but did have the harness in and capped so the chip was removed.
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  4. #4
    The old chip I had on mine was a Roo systems unit. It continually put large fuel leak codes up (P093)

    Sean
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  5. #5
    Quote Originally Posted by MidLifeCrisis View Post
    Do you know the code it showed? If you have a scan gauge or any reader that plugs into the OBD port you an see when it happens. I had 2 x code 1251 which relate to the turbo stepper I believe. Bloody annoying and I did NOT have my chip plugged in at the time but did have the harness in and capped so the chip was removed.
    hey MLC.mate it was that code you mentioned P1251 (34) turbo charger stepper motor curcuit (intermittent fault)
    120 gx 6sp man,tjm gold edition 2",maxxis bighorn,toyota ally bar with toyota super winch,light force xgt hid 50watt,duel batts,safari snorkel,diesel care secondry finer filter,redarc low coolant alarm,turbo timer,gme uhf,hema hn5i nav,tjm basket,red centre roll out awning,diy rear table...

  6. #6
    Pradopoint Guru! AJ120's Avatar
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    Quote Originally Posted by pradi2 View Post
    A couple of weeks ago I did a trip in the mid north coast it was fantastic it was the waterfall way between bellagen and armidale.while coming back from a museum owned by russell crowe
    I know its not the topic of the thread, but is that the Museum of interesting things? Lots or Russell Crowe memorabilia in that one and about the right area, not sure where it is because we were lost at the time Well worth a look anyway.

    Cheers Andrew
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  7. #7
    Avid PP Poster! Talktheroo's Avatar
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    When the P0046 code shows it's ugly head, that's when you have got problems. This is the supercharger boost control solenoid circuit and this controls the DC motor. It's not the DC motor that fails, it's the solenoid. The P1251 code is a warning code in relation to the boost and it has probably peaked for a short time and thrown the code. If it stays at peak boost for to long it can damage the engine, but not normally the case in this engine because the ECM corrects this quickly. If you get the other code, P0046 code, you are up for a whole new turbo assembly as it is not sold in bits. I don't know how much it is today, but probably about the $8,000.00 mark.
    Interesting to note with the P1251 code is that if you have modified your exhaust system the ECM can throw the code. Another interesting thing is that the ECM can throw this code if you get some sort of voltage drop in the battery too. It's all so linked these days with the ECM. I haven't heard of any problems with the actuator or the sensor there at this stage yet.
    John (Talktheroo).

  8. #8
    Addicted PP Member MidLifeCrisis's Avatar
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    Pradi2, sorry for this but Roo, my crank battery is coincidently on its last legs!!!!


    Pradi2, see my rig build, I took the rig in under warranty and they charged me $126 after reducing he cost from around $200 to find and solve nothing....
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  9. #9
    Quote Originally Posted by Talktheroo View Post
    When the P0046 code shows it's ugly head, that's when you have got problems. This is the supercharger boost control solenoid circuit and this controls the DC motor. It's not the DC motor that fails, it's the solenoid. The P1251 code is a warning code in relation to the boost and it has probably peaked for a short time and thrown the code. If it stays at peak boost for to long it can damage the engine, but not normally the case in this engine because the ECM corrects this quickly. If you get the other code, P0046 code, you are up for a whole new turbo assembly as it is not sold in bits. I don't know how much it is today, but probably about the $8,000.00 mark.
    Interesting to note with the P1251 code is that if you have modified your exhaust system the ECM can throw the code. Another interesting thing is that the ECM can throw this code if you get some sort of voltage drop in the battery too. It's all so linked these days with the ECM. I haven't heard of any problems with the actuator or the sensor there at this stage yet.
    John (Talktheroo).
    hey john i have heard about your knowledge on this type of issue and very ecstatic on your response. so at the moment as long as I don't get the P0046 code all should be good and i was told that a turbo is around the $6000 mark hopfully I won't be going down that path.. hey andrew it is the museum of interesting things.It is one of those places of interest you only stumble across because it's not really publicised...
    120 gx 6sp man,tjm gold edition 2",maxxis bighorn,toyota ally bar with toyota super winch,light force xgt hid 50watt,duel batts,safari snorkel,diesel care secondry finer filter,redarc low coolant alarm,turbo timer,gme uhf,hema hn5i nav,tjm basket,red centre roll out awning,diy rear table...

  10. #10
    Avid PP Poster! Talktheroo's Avatar
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    Yep, sounds about where Toyota Service stands today. Their outstanding citizens you know, bit like the wrecking yards of old, just fresh out of jail type people. It's Toyota owner beware type thing MLC, and they charged you for doing nothing except for getting rid of the code and not telling you what caused it.
    The Roo.

  11. #11
    Quote Originally Posted by MidLifeCrisis View Post
    Pradi2, sorry for this but Roo, my crank battery is coincidently on its last legs!!!!


    Pradi2, see my rig build, I took the rig in under warranty and they charged me $126 after reducing he cost from around $200 to find and solve nothing....
    I'll check out MLC thanks mate
    120 gx 6sp man,tjm gold edition 2",maxxis bighorn,toyota ally bar with toyota super winch,light force xgt hid 50watt,duel batts,safari snorkel,diesel care secondry finer filter,redarc low coolant alarm,turbo timer,gme uhf,hema hn5i nav,tjm basket,red centre roll out awning,diy rear table...

  12. #12
    Avid PP Poster! Talktheroo's Avatar
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    Well, there you go, what a bargain, 2010 prices, $6,000. I guess we should all feel lucky that the price has not gone up on the turbo assembly. I know I do.
    Yes, on the P1251 code, watch the buggers, because it's a code that has got potential for a rip off. The old P1251 code Maxwell Smart type thing if you know what I mean, wink, wink. Just ask them why they think it's come up, the code that is, and if they say they don't know say back to them that's not good enough and don't pay them. That's what I reckon and my PM is always open as I love catching these arseholes out. We can do it together and have some fun with the knowledge. I am a member of Global services just as they are.
    The Roo.

  13. #13
    caught on now roo wink wink.Don't want to intrude on one of toyota's profit margin's...
    120 gx 6sp man,tjm gold edition 2",maxxis bighorn,toyota ally bar with toyota super winch,light force xgt hid 50watt,duel batts,safari snorkel,diesel care secondry finer filter,redarc low coolant alarm,turbo timer,gme uhf,hema hn5i nav,tjm basket,red centre roll out awning,diy rear table...

  14. #14
    Avid PP Poster! Talktheroo's Avatar
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    That's the business name for it but the real name for it is a criminal offence. Fraud I think they call it.
    The Roo.

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