Question about Toyota Prius

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Loss of power with check engine light on

Scan tools do not have the capability to diagnose this vehicle. fuel filter ,air filter element remove and replace.check fuel return and it`s fine.is this vehicle design to shut out if you loosen the injector line on any of the cyclinders? or the line pressure low . problem is no scan tool to read codes .no spec on this .

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I had a similar problem and found that the fuel relay switch failing was the culprit There is a video on you tube Toyota Prius 2001 Engine warning fuel pump problem ODB Code P3191 which is helpful

Posted on May 21, 2014

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Do not try replacing various doubts as it will just waste your time and money both and may some major problem occur like stalling or some major failure as to avoid this the diagnostic is severly required. feel free for further queries thanks.

Posted on Sep 21, 2008

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First try to turning off the car and waiting about 10 minutes before restarting.

May be the accelerator sensor switch is at fault and should be replaced.

You need to go for service center for proper diagnose. Let me know if I can assist you further.

Regards
ELLIN

Posted on Sep 21, 2008

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It's a matter of because the check engine light came on and at the same time you have loss of power this indicates that the vehicle went into limp in mode. the only way to figure out why is to do a diagnostic on it so you don't spend hours trying to figure out the exact problem by guessing and replacing what you might think it is. there is a multitude of reasons for loss of power but the check engine light is a good indicater that the ecm threw a code or more. contrary to popular belief it is not an idiot light especially on a hybrid like the prius. if you loosen a line it will most likely stall not just lose power. the vehicles are pressure sensitive and would throw a code. you have an array of sensors just for the fuel system alone. if it were bad filters you would have rough idle ,hard starting ,or stalling while stopped. none of which you mentioned.

Posted on Sep 21, 2008

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Civic 06 vti using excesive amount of fuel


The computer will very likely be generating engine fault codes if you have quite excessive consumption and there is no point in guessing what the problem is as there can be numerous causes. You have not mentioned if you have a check engine light showing but if you don't just yet you soon will if the problem persists.

1. Go to a reputable mechanic and have the car scanned for fault codes because it will be very likely throwing some codes if you are having a high engine fuel consumption issue (as opposed to a loss of fuel from the fuel system due to an external fuel leak).

2. On thing you can do yourself is remove the old dusty air filter element in the air intake box ( which no doubt has not been changed since ????) and put in a new OEM air filter unit. A dirty clogged unit will cause your engine to run poorly.

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Increased fuel consumption


First-- fire your repair shop & get one that
listens to your explanation of vehicle problems

They have to diagnose the vehicle, not just tell
you no codes are present.

The check light will leave codes stored

Spark Plugs don't exactly make for a tune-up

For over 30 years the car computer does the tuning

The upstream or front oxygen sensors should be replaced
on all vehicles at 100,000 miles,was that done

Was fuel trim checked
Was any scan tool data looked at
Was the car road tested with scanner

Don't need 12 oz of injector cleaner in 15
gallons of fuel,that won't do a thing

There are at least a dozen tests that should be done,
at least once a year, on all vehicles,not wait until you
have a problem

The main theme on this web site,seems to be a
deteriorating repair shop capability & the vehicle
owners ability to communicate with them, as a result
of decades of distrust & dislike, as well as no understanding
of test equip costs & parts costs

The shaking could simply be from using the wrong oil &
not changing it 4 times a year or more & now you have
variable valve timing issues

So many things to to be checked out

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