Dashboard setup for “economical driving”

Discussion in 'Gen 4 Prius Fuel Economy' started by JohnF, Apr 30, 2016.

  1. bhtooefr

    bhtooefr Senior Member

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    Based on my ScanGauge, when that happens, the engine's running at about ~1080-1230 RPM at basically no load, usually to either generate coolant temperature or run the transmission oil pump.
     
  2. alanclarkeau

    alanclarkeau Senior Member

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    Possibly - but it's very soft if that's so. The transmission oil pump is part of the transmission, I believe, not ICE driven.
     
  3. bhtooefr

    bhtooefr Senior Member

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    It is part of the transmission, but it's driven by the planet carrier, which is driven by the engine.

    1:26:43 if it didn't jump there:



    On the Prime, it's driven electrically instead, so the engine need not be running for the transmission to be lubricated.
     
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  4. alanclarkeau

    alanclarkeau Senior Member

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    Yes thanks, now I see that - and TOYOTA agrees:

    upload_2019-1-4_10-7-10.png

    What's interesting, being driven by the ICE means that the pump is only lubricating when the ICE is running - or there might be an oil slinging as well by gears sitting in ATF.

    I'd thought I'd read somewhere that it's still pumping when the ICE is off - but that must be the PRIME as you mentioned. I assume the PRIME, because it could be driven 20+ miles without the ICE running would need lubrication some other way - hence being pumped electrically.

    Any idea how the Gen 3 PIP lubricated it - or did it have an electrical pump too?
     
  5. bhtooefr

    bhtooefr Senior Member

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    Gen 3 PiP was mechanically driven off the ICE - that was one of the big things about the Prime, that it finally had an electric pump.
     
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