Engine screaming and battery draining

Discussion in 'Gen II Prius Care, Maintenance and Troubleshooting' started by tigrang, Mar 26, 2012.

  1. tigrang

    tigrang New Member

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    I bought a used 2008 Prius a couple weeks ago. The car was running fine until a day or two ago. I would normally get 40 MPG. Now I am getting 30. While driving I am also noticing that the engine is very loud - it was not like this before. I connected an ODB-II tool and noticed the engine is revving to 5000 RPM. The car also feels like its not "shifting" (although I know it doesn't have gears like a normal transmission) until I let my foot off the gas. Also, the battery is dropping to 2 bars (purple) which I did not notice happening before, and the engine becomes even louder.

    The ODB-II does not find any fault codes and there are no warning lights on the dash either.

    I washed the engine compartment with a high-pressure hose. The engine was off but the battery was not disconnected. I don't know if this could be the cause of the problem (not sure if it started before or after this)

    Thank you for any help.
     
  2. adamace1

    adamace1 Senior Member

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    You should not have washed under the hood with water. I'm not saying thats the problem but am very worried it is. Good luck to you and keep us posted.
     
  3. ursle

    ursle Gas miser

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    :welcome:
    Just thinking about the spark plug wells(4-5" deep hole in the top of the block the spark plugs live in), if one of the wells had a leak and filled with water it would tend to short that cylinders spark, 12v battery might be new might not.
    I'd error on the side of caution, a dealer might be spot on for diagnosis and after a dealers input using this forum might find someone that also hosed and died or second guess the dealers diagnosis.
    I've hosed my '06 twice but I wasn't high pressure and I wasn't allowing lot's of water to stagnate near the spark plugs.
    My short experience with a cylinder misfiring produced 30ish mileage but my usual was 53+, so 40 is already inconvenient, back to the 12v, if it's toast your mileage will be lower than it could be, @ 65mph+ high 40's, @55-mph 50's +
     
  4. tigrang

    tigrang New Member

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    Thanks for the welcome and thank you for the quick responses adamace1 and ursle.

    I ran another ODB-II with a Toyota specific tool now (Autoenginuity, finally arrived in the mail), and there was a DTC in Transmission Control: C2318 Low Voltage Error (Power Supply Malfunction).

    The issue is that my foot is flat on the gas, the engine is roaring, but the car just isn't moving. This starts happening more at speeds over 60mph.

    I'm trying to narrow it down. Any help would be greatly appreciated.
     
  5. tnp

    tnp Junior Member

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  6. tigrang

    tigrang New Member

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    Thank you, tnp. Its dark now so I will check that first thing in the morning.

    Edit: I should note that I have no warning/error lights on the dash though. Anyways, thank you all and I will get back to you tomorrow.
     
  7. tigrang

    tigrang New Member

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    I went ahead and this this now with a flashlight. I can see the water in the reservoir moving.
     
  8. Patrick Wong

    Patrick Wong DIY Enthusiast

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    1. Try disconnecting the 12V battery negative cable where it bolts to the body for several minutes, then reconnect. The point of this is to give all ECUs a chance to power down and reset.

    2. After reconnecting the battery, see if you still have a problem.

    3. If you still have a problem and you believe that the problem was provoked by your washing the engine compartment, then I suggest you will have to look at all electrical connectors related to the inverter and transaxle that may have been impacted by your washing effort. Ideally you would remove each connector and inspect for moisture, corrosion etc.

    4. I also suggest that you check your 12V battery's voltage after the car has been IG-OFF overnight. Ideally you would measure 12.6V or better. If lower than that and you have a charger, it would be good to fully-charge the battery overnight. After charging the battery and waiting several hours for the surface charge to dissipate, if you don't measure 12.6V or better you may want to replace the battery.
     
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  9. SageBrush

    SageBrush Senior Member

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    Normal behavior in the Prius is to have the ICE rev to high rpm when the traction battery SOC goes below a threshold value. The car's control logic is saying "charge up the traction battery NOW." If you ask for motive power while this event occurs you will notice anemic response, and of course MPG will be poor since the energy is flowing to the battery rather than the driveshaft.

    This is usually an uncommon event, and unless you are driving up a long uphill, short-lived.

    So that is the "what is going on?" Unanswered is why the traction battery SOC is low in this car, and whether the traction battery is charging. One possibility is a bad traction battery, but the usual symptom is rapid change in the SOC from empty to full, and not staying empty. This sounds more like either an ongoing unexpected drain of the traction battery that requires the ICE to send juice all the time, or a short to the traction battery.

    My best advice: follow Patrick Wong's advice!
     
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  10. seilerts

    seilerts Battery Curmudgeon

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    Use the live data feature of your OBD to check ignition advance (about 15) and coolant temperature.
     
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  11. tigrang

    tigrang New Member

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    The battery completely died last night as I had my laptop connected to the car while doing brake bleeding. Took a while to recharge the battery. Afterward I checked for coolant temperature which was 140F and the closest thing to Ignition advance I could find was "Ignition timing advance #1" which was at 5.
     
  12. seilerts

    seilerts Battery Curmudgeon

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    I should have mentioned, you need to have been running on the highway for 10+ minutes before checking these values, so make sure that the engine is up to operating temperature, and that the ignition timing is advancing to its most efficient value.
     
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  13. andyprius

    andyprius Senior Member

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    Did this car have a salvage title? That can be Bad, there are literally thousands of Prii out there with salvage titles, especially California. Ca is quicker to total and then label the car "Salvage". Before you do any more work on the car "READ the archives!"on the problem area. You never bleed the brakes! It requires a special machine at Toyota. Listen to our tech experts and read the archives! You will probably have to replace that 12V Bat for a start. On cleaning the engine, you can use some engine cleaner and then a very fine mist of water to rinse. I do it often. But NEVER use high pressure. As pointed out those igniter wells and spark plugs are subject to shorting. Have fun :cheer2:
     
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