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Transaxle MG1 sensor wire position?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by fredtr, Nov 20, 2011.

  1. fredtr

    fredtr Junior Member

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    I'm still trying to get my project 2001 Prius to attempt to start the ICE. I can drive the car around electric only, so MG2 is OK. I see a pulse of current going to MG1 as it does it's startup tests. So I'm thinking maybe the MG1 position sensor is faulty.

    Does anyone know where on the transaxle the MG1 position sensor wire is located?

    Or anyone have any ideas what may be not allowing the ECU to try to start the ICE? The code is P3215 but I don't have any way of reading the sub code.

    Thanks,

    Fred
     
    #1 fredtr, Nov 20, 2011
  2. seilerts

    seilerts Battery Curmudgeon

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    Fred, you have AutoEnginuity w/Toyota? It will not give you the 3 digit code, even in the freeze frame data? This is for P3125 right?
     
    #2 seilerts, Nov 20, 2011
  3. fredtr

    fredtr Junior Member

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    Unfortunatly it does not. What it does is to read 94 from who knows where and displays that. If I force other errors, for example unplugging HV. It then associates the 94 with that error. I have the latest Enginuity software and firmware and have the Toyota package.

    This is the log:

    -------------------------------------------------------------------------------
    Code ID: 0x3125
    + Display Text: 'P3125 Inverter Malfunction'
    + Code Type: Stored Code
    + Module: Manufacturer Specific
    *** No Freeze Frame Associated with code ***
    -------------------------------------------------------------------------------
    Pulling Enhanced interface DTCs: completed
    COBDIIMainFrame::ShowCustomNoticeBoxDialog( bool show (Yes) )
    Pulling FF for 2 entries...
    FF Information #2:: 0.00 and 0.00
    FF Information #3:: 0.00 and 0.00
    FF Information #4:: 0.00 and 0.00
    Enhanced Freeze Frame for DTC P3125:
    + Information #2: 94
     
    #3 fredtr, Nov 20, 2011
  4. seilerts

    seilerts Battery Curmudgeon

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    Sigh. I'd be interested in hearing what happens if get in touch with Jay Horak at AutoEnginuity and explain the short-coming. They do have Techstream, so maybe worst case is that you trailer the car over to them and they give you the code. Better might be a site visit from one of them to show that there is a real issue here. I think you are screwed without knowing the 3 digit INF code.

    I've attached the MG1 physical diagram that shows where the sensor wiring harness exits.
     

    Attached Files:

    • mg1.GIF
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    #4 seilerts, Nov 20, 2011
  5. fredtr

    fredtr Junior Member

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    Thank-you for the response. I asked them on Friday what they would charge to come out here and read the code, I'm about an hour from their facility. They said they don't do that.

    Am I understanding the drawing correctly? Going down the left side, satrting at the power cable cover, about 60 degrees counter clockwise there is a wiring harness connector. And that is where the sensor wire is?

    Thats great, thanks, I will put a scope of the signals, see if I can see anything when it sends the initial test pulses.
     
    #5 fredtr, Nov 20, 2011
  6. vincent1449p

    vincent1449p Active Member

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    Besides Techstream, you can also try ScangaugeII with Xguage. I 've verified the INF codes are the same being read by Techstream. Any way for you to borrow a SGII to test?

    Vincent
     
    #6 vincent1449p, Nov 20, 2011
    1 person likes this.
  7. fredtr

    fredtr Junior Member

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    Thank-you for the suggestion. I will buy a different scanner, if it actually works. I didn't understand what XGAUGE is. I clicked the link and it brought me to a thread about someone diagnosing a different problem. Is XGAUSGE a separate package I need to buy? Is it like Auoenginuity and I need to buy a Toyota package and then a yearly subscription?

    Thanks,

    Fred
     
    #7 fredtr, Nov 20, 2011
  8. vincent1449p

    vincent1449p Active Member

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    XGauge a.k.a. Add-A-Gauge is a feature that let you customize your SGII by adding additional vehicle specific digital gauges. It came with SGII as standard and no need yearly subscription. It is not as powerful as AE but if INF codes are all you need, then the SGII is able to do that.

    Vincent
     
    #8 vincent1449p, Nov 20, 2011
  9. seilerts

    seilerts Battery Curmudgeon

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    Vincent, that's good to know. It is a shame that AE does not fully support Gen 1. I was hoping that Fred's proximity and definite bug will pique their interest, but apparently not. However, Fred, I do encourage you to try to reach Jay Horak, who I think is the lead engineer for the Toyota package.
     
    #9 seilerts, Nov 20, 2011
    1 person likes this.
  10. fredtr

    fredtr Junior Member

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    I jacked up the car, thinking I could put a scope on the MG1 and MG2 positions sensors, see if I can see a problem with MG1 and maybe even get the ICE to start. I have the wheels turning, speedometer says I'm going between 5 and 20 mph. What I don't see is the ICE turning. I thought the ICE was always connected to the outer ring gear. Can someone explain to me what engages the ICE?

    Thanks,

    Fred
     
    #10 fredtr, Nov 25, 2011
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