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post #1 of 6 (permalink) Old 01-27-2009, 01:25 PM Thread Starter
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Default 2003 Prius COLD Weather Problems : trouble starting

Hello everyone, Im glad I found an internet forum for exactly what I am looking for !

My mother has a 2003 Toyota Prius, and when it is COLD outside, the Car has to be started and Restarted 2 3 o4 even 4 times, until it will Stay running.

If the weather outside is warm and nice, the car will always start, never giving her any problems whatsoever.



p.s. The Battery was tested and is OK.
also. The warrenty is Expired on this Vehicle for as far as i know.
The car has 82k Miles on it.

I actually took 2 pictures to show the warning lights I recieved myself.

pictures :

http://i453.photobucket.com/albums/qq25 ... 090915.jpg

http://i453.photobucket.com/albums/qq25 ... 90915a.jpg


anyone have any idea's?
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post #2 of 6 (permalink) Old 01-27-2009, 03:24 PM
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Default Re: 2003 Prius COLD Weather Problems : trouble starting

I had similar problems when the oil was overfilled. No problem when it's warm outside, but won't start when it's cold. The error displays occur when engine does not start immediately (computer can sense that the ICE isn't running). Somehow the engine sucks oil up into the throttlebody or something. Perhaps, others can provide a more technical explanation.
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post #3 of 6 (permalink) Old 01-27-2009, 04:28 PM
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Default Re: 2003 Prius COLD Weather Problems : trouble starting

If the oil level is ok then probably the throttle body is dirty, interfering with the cars' control of idle rate. It's easy to clean, but best to have a dealer do it if you've never had experience. The dealer will also look for stored codes which may indicate something else is causing it.

Vehicle:
Pearl is a 2007 Driftwood Pearl Prius
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post #4 of 6 (permalink) Old 01-28-2009, 12:25 PM
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Default Re: 2003 Prius COLD Weather Problems : trouble starting

I'd second a dirty throttle body as a possible culprit because ours of the same vintage did the same thing. The airflow sensor on these are very sensitive and even a small amount of contaminant can cause the engine to not get the proper air intake. Cleaning it stopped the problem, but if you don't feel comfortable doing that, take it to the dealer. It could be something else as well, thus the dealer could scan the codes.
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post #5 of 6 (permalink) Old 01-28-2009, 02:11 PM Thread Starter
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Default Re: 2003 Prius COLD Weather Problems : trouble starting

all those problems will come out of the wood work, when the below freezing temperaures show up ?
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post #6 of 6 (permalink) Old 01-28-2009, 02:33 PM
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Default Re: 2003 Prius COLD Weather Problems : trouble starting

Quote:
Originally Posted by xklipze
all those problems will come out of the wood work, when the below freezing temperatures show up?
Cold weather does tend to make small problems into noticeable ones. The was a TSB on this issue and an updated ECU will have firmware to allow more time for the engine (ICE) to start before throwing error codes. Sorry but replacing the ECU can be expensive (There is no supported method for updating the firmware in the NHW11 other than an ECU replacement). You can look for one from the salvage community, but do your research to determine that it has the updated firmware.

Cleaning the throttle body is easy and may fix the symptom.

JeffD
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