OBD2 can communicate with engine- no battery info- works on other Prius

Discussion in 'Gen 2 Prius Main Forum' started by ProspectivePriusPeruser, Dec 3, 2019.

  1. ProspectivePriusPeruser

    ProspectivePriusPeruser Junior Member

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    As the title says, I was loaned a Hybrid compatible scanner that works on another Prius to try and diagnose my odd battery issues I have previously posted about. The scanner can see engine data just fine using Prius Doctor, but won't see anything for voltage readings. The same scanner was used on another 2nd gen with no trouble accessing voltage data.

    Incidentally, sometimes when using the OBD port, I get the red triangle of death on the dash & 'problem' on the MFD. Aside from the HV oddities I've recently encountered the car runs perfectly.

    Does anyone have any suggestions for what's going on and how to fix?

    Cheers
     
  2. PriusCamper

    PriusCamper Senior Member

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    Try your phone on the other Prius that loaned you the scanner... Perhaps the problem is with your phone? If the battery data you can't see in Dr. Prius app can't be seen by the car's computer you'd have a red triangle that wouldn't clear and car wouldn't go anywhere but into neutral.
     
  3. ProspectivePriusPeruser

    ProspectivePriusPeruser Junior Member

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    Thanks for the suggestion! I've done the opposite, he used his phone with my car and got the same results as I did. Just a bunch of N/A for all the readings.The app also says that it needs to be used with a 2nd Gen/3rd gen Prius and that mine isn't compatible. It definitely is a 2nd Gen though. Very confusing and annoying.
     
  4. PriusCamper

    PriusCamper Senior Member

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    In that case I'd inspect the plug socket for anything unusual and try to see if Hybrid Assisstant App has the same problem. Also try a different OBD2 reader... Many OBD2 readers are problematic... I have bought identical readers and some of them will work with Dr. Prius, but not Hybrid Assistant, also compatibility with other people's phones has been a hassle. Never heard of the car being the source of it not working though. Also, the person who created Dr. Prius app wrote this article about which OBD2 readers are junk: Hybrid battery diagnostic and repair tool for Toyota and Lexus And last resort after exhausting these options contact person who wrote Dr. Prius app and tell them what your error screen says about your car not being compatible. The person who built the app will likely be interested in fixing that if it actually a fault in their app.
     
  5. ProspectivePriusPeruser

    ProspectivePriusPeruser Junior Member

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    I've just tried Hybrid Assistant, which just says 'Waiting for car', Carista says 'Vehicle not responding', Dr. Prius won't even try & Prius Doctor only gives me engine info, nothing about the battery. This used to be a taxi with heaps of equipment in it, could it be a wiring issue?
     
  6. PriusCamper

    PriusCamper Senior Member

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    Yes, that would explain it... At this point it's a matter of tracking down all the after market wiring work in the dashboard and trying to neutralize that which is not letting the signal to reach the OBD2 port. I suspect the cab had a bypass of some sort to record vehicle data elsewhere. If I were you I'd research the name of the company that normally puts after-market systems into the cabs in your part of the world and then contact them and tell them the problem. Alternatively, you could put your battery pack in a friends car to get the data. But seems to me that you'll feel more comfortable about your car going forward if you get this problem solved.
     
  7. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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