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Discussion Starter · #1 ·
I've been having problems with my Prius stalling for the last few
months. I got the car last summer and the problem began to occur when
the weather became cold. So it only does it when its cold.


Here's what happens. The car starts fine, I drive away but with a
couple of hundred yards it stalls when I am slowing down (@10mph). It
will not then start again. The ready sign does not come on. I have had
to disconnect the 12v battery lead and reset the ecu before I can
restart.

But if when I start the car I put it in D and rev it for a couple of
mins it does not stall. So when it has warmed up a bit it drives fine
without stalling.

I took it to Jemcar in London who, specialise in these imports, and
have a computer they can link it to but no fault codes show up when it
stalls. They have even kept it overnight and then driven it linked to a
machine but when it stalls they say no fault codes show. They say it
must therefore be a part that cannot be diagnosed. So what could it be?
It's a real mystery? And I need some help/advice for all you Prius
owners who may have had a similar problem or an idea what it could be.

Here are the parts I have changed in the last few weeks. The Oxygen
sensor, the temp sensor, the spark plugs and the 12v battery. The
airflow meter has been cleaned.

I'm also puzzeled as to why the ready light doesn't come on after the car has stalled... forcing me to disconnect and reconnect the 12v battery.

Thanks
 

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kjaved said:
But if when I start the car I put it in D and rev it for a couple of
mins it does not stall. So when it has warmed up a bit it drives fine
without stalling.
How do you put the car in D and rev it? If you are in D and giving it gas, your are moving.
 

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My ex bf's had a clogged fuel injector or something stupid in his Nissan 240sx.. at lights, in order to keep from stalling, he would step on the brake, and have to give the engine gas.. maybe this is something similar?

Not necessarily a clogged fuel injector.. but the whole, in "drive" mode, with the foot on the brake giving the car gas..
 

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Given how part of the braking system is also part of the propulsion system (the motor generators), it isn't clear to me what the car would do if you tried to give it gas while keeping it firmly stopped with the brake. I would bet that it doesn't act like a normal car and rev the engine though. I'm not going to try it on my car. Does anybody know what would happen?
 

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At first I too thought this might be a resurection of Melgish's joke.

At least in North America, an ICE failure does not prevent you from going to READY. At least for as long as there is sufficient energy left in the main battery. You can still drive a very short distance in this condition. Therefore, I doubt it is strictly an ICE failed to start error. Besides, there's a code for that. That would rule out injectors, oxygen sensors and the like.

But it does help to know if we are dealing with the Classic or the HSD. The classic had some exhaust valve issues. I don't know if this would prevent READY, though it really shouldn't.

At least we know from context that you are in the UK.

Be sure that the repair center you are using is able to read all Prius codes, including the proprietary ones. If it is a generic scanner they are using, this might explain why they see no codes.
 

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Discussion Starter · #11 ·
redwein said:
kjaved said:
But if when I start the car I put it in D and rev it for a couple of
mins it does not stall. So when it has warmed up a bit it drives fine
without stalling.
How do you put the car in D and rev it? If you are in D and giving it gas, your are moving.
Yes I would be moving but I have the handbrake on and my foot on the brake to prevent it from moving.
 

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Discussion Starter · #12 ·
DanMan32 said:
At first I too thought this might be a resurection of Melgish's joke.

At least in North America, an ICE failure does not prevent you from going to READY. At least for as long as there is sufficient energy left in the main battery. You can still drive a very short distance in this condition. Therefore, I doubt it is strictly an ICE failed to start error. Besides, there's a code for that. That would rule out injectors, oxygen sensors and the like.

But it does help to know if we are dealing with the Classic or the HSD. The classic had some exhaust valve issues. I don't know if this would prevent READY, though it really shouldn't.

At least we know from context that you are in the UK.

Be sure that the repair center you are using is able to read all Prius codes, including the proprietary ones. If it is a generic scanner they are using, this might explain why they see no codes.

The dealer I'm using says he has an advanced machine especially imported from Japan for these cars. He plugged the car into a couple of times and it showed zilch when it stalled. What are the "proprietary" codes?
 

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kjaved said:
Stalling meaning the car stops becaue the engine has cut out.
You do understand that the engine is *supposed* to stop, that is, it does not run continuously while driving? (Sorry if this is a stupid question, but there have been people who did not know that, so I want to be completely certain.) If you mean that the car goes to the OFF condition, as though you had parked it and shut it off, it would be less ambiguous to call that a shutdown rather than an "engine stall". Assuming it is a shutdown, then my guess is that there's a fault in a computer or a wiring harness. Diagnosing that without fault codes could be expensive, basically just replacing stuff until it works again.
 

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Discussion Starter · #14 ·
richard schumacher said:
kjaved said:
Stalling meaning the car stops becaue the engine has cut out.
You do understand that the engine is *supposed* to stop, that is, it does not run continuously while driving? (Sorry if this is a stupid question, but there have been people who did not know that, so I want to be completely certain.) If you mean that the car goes to the OFF condition, as though you had parked it and shut it off, it would be less ambiguous to call that a shutdown rather than an "engine stall". Assuming it is a shutdown, then my guess is that there's a fault in a computer or a wiring harness. Diagnosing that without fault codes could be expensive, basically just replacing stuff until it works again.
Thanks Richard, I understand what you are saying. I'm afraid I mean it is a shutdown. The main clue is that it only happens when its cold, other times it works fine.
 

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kjaved said:
DanMan32 said:
At first I too thought this might be a resurection of Melgish's joke.

At least in North America, an ICE failure does not prevent you from going to READY. At least for as long as there is sufficient energy left in the main battery. You can still drive a very short distance in this condition. Therefore, I doubt it is strictly an ICE failed to start error. Besides, there's a code for that. That would rule out injectors, oxygen sensors and the like.

But it does help to know if we are dealing with the Classic or the HSD. The classic had some exhaust valve issues. I don't know if this would prevent READY, though it really shouldn't.

At least we know from context that you are in the UK.

Be sure that the repair center you are using is able to read all Prius codes, including the proprietary ones. If it is a generic scanner they are using, this might explain why they see no codes.

The dealer I'm using says he has an advanced machine especially imported from Japan for these cars. He plugged the car into a couple of times and it showed zilch when it stalled. What are the "proprietary" codes?
It would be hard for us to help you with a Japanese '98. I personally only have specs on the '04+, but have some familiarity with the classic ('01-03 MY)

ODBII specs have standard codes for certain engine characteristics, especially ones relating to emissions. However, manufacturers can add their own codes that other manufacturers don't use or define. With a hybrid being so specialized, there are lots of proprietary codes.
 

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question

question: when it "stalls" does the dash lights stay on? do you still see the speedometer?, or does it just kick out of ready mode? This happened to me when my inverter overheated, the ready light would kick out at 12 or so mph.
 

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The ready light might kick out but you may still be in IG2. Ig2 is the 12V side of the READY mode. A Pre-READY if you will. READY is when the HV battery is connected. IF the inverter overheats, of course HV power should be removed from it. You could still however have all the 12V power remain.
 
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