2007 Prius stalled and won't start - Dealer is going to replace the computer

[paprius4030]

Yes, there have been cases where it's taking awhile for an oil overfill the gum up the works. It baks up into the throttle body and really causes alot of problems. Checking the oil level would be the first thing to check.

[ghanashyamjoshi]

Originally Posted by Mike Dimmick

Much more likely to be P0A0F, P3193, P3190, P0171. There is no code P040F or B3193.

P0A0F is reported by the HV ECU and indicates an engine start problem reported by the ECM, so check the ECM codes. P3190 is Poor Engine Power, P3193 is Fuel Ran Out, P0171 is System Too Lean (Fuel Trim).

I'd start by filling the tank. If the engine still won't start, then investigate air leakages or blockages - make sure that engine air filter is properly installed.

The full diagnostic tree before reaching the 'I dunno' step - replacing the ECM - is quite long. Um, posting the whole P3190/P3191/P3193 section is fair use, right? See the attached PDF.

You have it right, the SalesRep was a little confused about the codes written by the tech

The codes are P0A0F and P3193

I will definitely follow-up with the SalesRep for a code that shows the ECU is not working.

[ghanashyamjoshi]

Originally Posted by richard schumacher

Start with the simple gross stuff: check the oil level yourself. I would not even assume that the dealer has done this. What is the level now?

General good advice: always, always, check the oil level yourself before driving away from every oil change, no matter who did it.

The first thing that I did was - to check the oil level - atleast before I took the car at the dealship, oil level was upto the second dot.

[ghanashyamjoshi]

Originally Posted by Patrick Wong

I agree with Mike's suggestions. After that is done, if the engine ECU is still found to be at fault, I would ask the tech whether it is reasonable to reflash the ECU with the latest firmware first, rather than replace the ECU?

If the MAF was disconnected a DTC should be logged. The electronic throttle also has DTC related to it.

I would definitely ask the SalesRep about the firmware again, The first time when I asked him about a patch to correct the problem he mentioned that the firmware patch was only released for 2004 model, there are no updates to the firmware for 2007

[Patrick Wong]

Originally Posted by ghanashyamjoshi

...he mentioned that the firmware patch was only released for 2004 model, there are no updates to the firmware for 2007

Although this may be true, it is possible that the ECU memory storing the firmware became corrupt. If the firmware is downloaded again (even if same version as original) then maybe the ECU will resume its proper functioning (assuming that it is currently inoperative.)

To provide an example, the firmware on my 2004's engine and hybrid vehicle ECUs was updated by a Honolulu dealer at the time that the SSC was released a few years ago. This past summer I had driveability issues. My Tucson dealer downloaded the firmware to those ECUs again, and that resolved the problem.

[ghanashyamjoshi]

Originally Posted by Mr.Vanvandenburg

You are in CA, make sure you are still not covered by the extended emissions warranty. I don't have my book handy, but I believe the ecu may be still covered at 99K. Like others said, ecu's are reliable once in use. On "normal" cars it is usually possible to reset the main ecu by disconnecting the battery, sometimes it takes an hour. On the 07 II, not sure what needs to be done to reset all the ecus or if it is possible even.

I would be suspicious of the diagnosis, and make sure it is the problem and not something else caused by the oil change shop. The air filter idea sounds odd, even if the filter is not there, there are no sensors telling it isn't. It may be grossly overfilled with oil, or some other blunder like pulling a connector off.

Guys great news based on this info from Mr. Vanvandenburg I talked with the dealer and found that my problem will be covered by the California Extended Emissions Warranty which is for 10 years/150K Miles. The Federal Warranty is for 8 years/80K Miles.

Thanks again!