prius 2007?

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Old 09 May 2014, 12:10 pm   #1 (permalink)
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Default prius 2007?

Last Sunday the following lights came on the dashboard while I was driving

1) Master Caution Light

2) VSC

3) ((!)) 'electronic brake malfunction'

4) Check engine light

5) ABS

I took it to Auto zone and their scanner showed the below information:

Code P3190

Poor engine power

Engine mechanical fault

Fuel system fault

Air intake or exhaust blocked

The car seemed to be handling fine, and I kept on driving. However, after a mile the car would go in neutral, I would need to stop before it will let me drive until it stopped running for good.

From what I gathered online, it could be the water pump for the inverter or/and the 12V utility battery. The water pump inverter was replaced on my car last year by dealer due to Prius recall so that's new. Battery is also tested and its in good condition. Currently there is no more recalls on this car. I've changed the mass air flow sensor today because I read that may help but it didn't Also, tried to erase the codes with scanner. It did erase the codes and shows 0 codes found but warning lights (except master caution light)are still on and that didn't help either. Its Prius 2007 and has about 90k in mileage.

Right now, it powers on but sometimes it doesn't. If it turns on the warning lights stays on.

i really appreciate any help to find out the potential problems. thanksss
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Old 09 May 2014, 12:25 pm   #2 (permalink)
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From browsing the forums, there are several reports of the P3190 on the 1st-generation Prius but I haven't found any for the 2nd-gen. It appears to indicate an engine no-start, so that doesn't point to anything specific.

Are you saying that sometimes the car goes into ready mode at power-on and sometimes it doesn't? If the car has its original 12v aux battery, I would definitely start by checking and/or replacing it. When the 12v battery is on its way out, it can cause some strange behavior, although yours sounds unusual for just a failing 12v.

Here's how to check the condition of the 12v battery.

Did you clean the throttle body when replacing the MAF?

Check the oil level and the condition of the air filter, since those are easy checks.

You might also ask your question on the forums at
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Old 09 May 2014, 12:40 pm   #3 (permalink)
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P3190 is not very informative, but it says the engine failed to fire up when it should have. In the second generation a generous amount of cranking time is allowed so the engine was definitely not getting fuel or possibly air. The Prius throws brake warnings like rice at a wedding, and the VSC will not operate if the engine is sick.

First what I can tell you - this is a problem in the engine operation, not in the hybrid system. If it were a conventional car you would experience it stalling but it would restart. I recommend a professional for this, though, and the dealer would be a good choice. It takes a Toyota Hand Held Tester to make the second generation engine run when the tech wants it to.

My hunch is the problem is in fuel delivery and the fix will be a new fuel tank. The fuel pump, pressure regulator, and filter are integral to the tank. Contaminated gas is the prime suspect. But the cost of the fuel tank makes guessing a very bad thing.

With this identifiable problem I suspect the intermittent "ready" is also the result of the fuel issue.

EDIT - if the fuel tank is condemned a tank from a wrecking yard would be a decent gamble. The labor is fairly small compared to the price of a new tank and the going price at wrecking yards is $150-$200.
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