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No READY LIGHT, car can't start!

Discussion in 'Gen 2 Prius Technical Discussion' started by Dxta, Oct 19, 2018.

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  1. Dxta

    Dxta Senior Member

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    Thanks bisco, would do that also.
     
    #21 Dxta, Oct 20, 2018
  2. Dxta

    Dxta Senior Member

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    1. The shifter shows the gear shift levels, when shifted when you put the ignition to the ON position.
    I might have to get a shifter somewhere, and swapped em.
    2. Which of the 12V relays you talking about?
    3. On disconnecting the negative aux battery terminal, be did that to see if the car would start.
    After several attempts, it didn't start according to him.
    4. Service plug when inserted properly, showed 218VDC on the battery side of the contactor relay assembly.
    That tells me, I still got some juice in the pack.
    All block voltages were showing a consistent 15....volts via tech stream.
     
    #22 Dxta, Oct 20, 2018
  3. Dxta

    Dxta Senior Member

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    What I intend to the next:
    1. Get another battery of 13V now
    2. Fob closer to the fob slot, and even maybe replace the fob battery key.
    3. Check the shifter knob
    4. Check the brake light switch

    Here's a question.
    If the shifter indicator on the dashboard comes ON, at every shifter movements, doesn't that depicts power from the aux battery is sufficient enough to power the contactor's so that the HV relays permits HV from the pack to the inverter assembly area?
    I know its the hv ECU that sends a dedicated 12volts to the contactor relay assembly, in order to open the HV relays.
    Maybe a problem with the hv ECU power supply circuitry (an open)?
     
    #23 Dxta, Oct 20, 2018
  4. Dxta

    Dxta Senior Member

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    Isn't it possible for a failed DC-dc assembly to caused this problem?
    I had a similar experience some months back, where a customer's highlander suddenly stalled in motion.
    Car couldn't start. In his case, he had check hybrid system ON, and got the car scanned. Codes were retrieved, and after getting a used unit, the vehicle started.

    I'm just thinking this current Prius might be the same.
    Difference here was that there wasn't any codes stored, since this client had already disconnected the aux battery to clear codes.
     
    #24 Dxta, Oct 20, 2018
  5. The Electric Me

    The Electric Me Go Speed Go!

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    That's kinda why I asked if any codes were thrown after it stalled.
     
    #25 The Electric Me, Oct 20, 2018
  6. Dxta

    Dxta Senior Member

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    I wasn't there when it stalled.
    Owner reported the issue, and I told him to disconnect the aux terminal to reset any codes.
     
    #26 Dxta, Oct 20, 2018
  7. The Electric Me

    The Electric Me Go Speed Go!

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    Too bad.
    Would of been easier to diagnose if the codes weren't reset.

    You refer to the owner as a client.
    Do you work as a mobile mechanic?
     
    #27 The Electric Me, Oct 20, 2018
  8. Dxta

    Dxta Senior Member

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    Yes, I do sometimes, if I'm not busy in the shop?
    Distance where the car is is just too far.
    Iight have to asked for the Prius to be towed o er to the shop on a loadbed for parts swapping:D
     
    #28 Dxta, Oct 20, 2018
  9. Salumi

    Salumi Junior Member

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    Hi
     
    #29 Salumi, May 3, 2020
  10. Salumi

    Salumi Junior Member

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    I got prius 2010 not coming in ready mood not throwing any code
    What do you think the problem is
     
    #30 Salumi, May 3, 2020
  11. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    Welcome.
    If it is not coming in READY mode and the triangle light is lit there ARE codes. Not all code readers can interpret the Prius specific codes.

    What is the condition of your 12 volt battery? If it is low the computers in the car get confused, causing all sorts of strange codes & symptoms.
     
    #31 Prodigyplace, May 3, 2020
  12. dolj

    dolj Senior Member

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    Low would be 8.5 - 10 V.
     
    #32 dolj, May 3, 2020
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  13. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    I thought 11.5 volts or less was considered low.
     
    #33 Prodigyplace, May 3, 2020
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  14. Dxta

    Dxta Senior Member

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    Do your dashboard lights get lit? If it does not, check the condition of 12V battery. If the dashboard lights are lit, and OK, probably the HV battery has issues, or the AM2 fuse has blown(the one that controls the inverter pump).
     
    #34 Dxta, May 3, 2020
  15. dolj

    dolj Senior Member

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    I probably worded that wrong in relation to your statement. Yes it is low, but those strange things will not happen at 11.5 V or that it necessarily means the 12 V battery needs to be replaced. But you wouldn't think so when you read some a lot of posts around PC.

    Besides which, the recent poster's car is a Gen 3, so really he should be posting in the Gen 3 forums. What we know about Gen 2s might not apply, or apply differently to another Gen of Prius.
     
    #35 dolj, May 4, 2020
    Last edited: May 5, 2020
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  16. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    I thought @Mendel Leisk said that voltage level had to do with it being an ACM battery used in both Gen 2 and Gen 3.
     
    #36 Prodigyplace, May 5, 2020
  17. dolj

    dolj Senior Member

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    AGM? I can't really comment. For sure there are slight voltage level differences between AGM and flooded Pb/A. I think the bigger problem is people seem to be getting too tunnel-visioned fixating on 12 V battery voltage.

    I think we've seen enough posts here in PC now in the vein of people reporting they thought buying a new 12 V battery and swapping it in would fix all their problems, only to find it fixed nothing and they were $1xx -$2xx out of pocket.
     
    #37 dolj, May 5, 2020
    Last edited: May 5, 2020
  18. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    You also get those like my son who replaced the 12 volt battery on his 8 year old Prius as cheap insurance it would not cause a problem. He ended up trading it in 2 years later for a Prius v.
     
    #38 Prodigyplace, May 5, 2020
  19. Gary Kiviniemi

    Gary Kiviniemi Member

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    Hi Dxta,
    I read this entire thread on "no start" problem.
    Perhaps I've missed it - could you share please what the problem resolution was?
    Thank you.
    GaryK
    Manchester TN
    (2005 Prius "Trius TRX" Truck project)
     
    #39 Gary Kiviniemi, May 5, 2020
  20. jerrymildred

    jerrymildred Senior Member

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    Agreed. My '05 was down to 8.5V and the only way I found out was noticing that the brake pump would run a really long time when I put the car in READY. No other indications.

    But I'm also kind of curious, @Dxta. Did you figure out the problem that started this thread?
     
    #40 jerrymildred, May 5, 2020
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