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No “ready” light with no error codes

Discussion in 'Generation 1 Prius Discussion' started by beachdaman, Aug 27, 2019.

  1. beachdaman

    beachdaman New Member

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    2002 Prius
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    Swapped a used hybrid battery ECU immobilizer and ignition into a 2002 prius. Car turns on but no “ready”. There are no error codes. I’m leaning towards inverter being bad since I don’t see inverter coolant pump moving liquid. I’ve checked fuses and battery is good.


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    #1 beachdaman, Aug 27, 2019
  2. bisco

    bisco cookie crumbler

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    wouldn't that be a bad pump?
     
    #2 bisco, Aug 27, 2019
  3. beachdaman

    beachdaman New Member

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    Yes, but I have had a prius run with a bad pump. It would start and then go into limp mode. I cant get the car to show “ready”


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    #3 beachdaman, Aug 27, 2019
  4. bisco

    bisco cookie crumbler

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    how bout the fuse?
     
    #4 bisco, Aug 28, 2019
  5. beachdaman

    beachdaman New Member

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    I checked them. Do you have a specific fuse/relay I should double check?


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    #5 beachdaman, Aug 28, 2019
  6. mroberds

    mroberds Member

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    By "immobilizer", do you mean the transponder key ECU? The factory service manual says that if you swap that ECU, you should do the following:

    1. Register the keys with the new ECU.
    2. Put one of the keys in the ignition, turn it ON, and leave it sit that way for 30 minutes.
    3. Turn the key to "start" and the engine should start.

    This is on page BE-103 of Volume 2 of the 2001 factory service manual. The pages around there have more information on how to learn in and unlearn the keys (most of which you can do without tools), etc.

    If you're looking at it on techinfo.toyota.com, the path is probably:

    Vehicle Interior > Body Electrical > Hybrid Vehicle Immobilizer System

    There is also:

    Vehicle Interior > Body Electrical > Hybrid Vehicle Immobiliser System

    with a few more pages from this section - note 's' instead of 'z'.
     
    #6 mroberds, Sep 14, 2019
    Last edited: Sep 14, 2019
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