GEN II P3190 DTC Engine Stalling, No start. PLEASE HELP...

Yes, a good idea to put a fuel pressure gauge on the fuel rail and see what the fuel pressure is. Should be 44-50 psi.

 

Very very odd its only throwing the 3120. Are you sure its not throwing a subset code or codes also as your in critical failure with no start. If not fuel/ignition related I would start looking at camshaft & crank sensor but they would throw a code also so perplexing. Maybe engine ECU?
How corroded is the bottom of the car as maybe you have connectoritis and have corroded crank sensor connector or something like that.

Is this car an accident rebuild?

And lastly what does your last sentence mean in your first post concerning the HV battery dying and needing recharge? I assume you mean the aux 12 volt battery not the HV battery. And what is the state of charge (SOC) of the Hybrid battery at this point?

 

May I suggest that for a serious problem like this, you get the real manual from techinfo.toyota.com or the equivalent Toyota Europe site,

Toyota Service Information


The camshaft position sensor is mounted in the head, on the side of the engine facing the inverter. However I really doubt that is your engine's problem.

You need to decide if the no-start problem is due to lack of fuel or lack of ignition. If the former, then the camshaft and crankshaft sensors are irrelevant.

Once you decide that lack of fuel is the problem, see whether the fuel rail has the correct pressure, 44+ PSI. If not, then there is something wrong with the fuel pump, the associated wiring, or the engine ECU.

If there is correct fuel line pressure but no fuel being injected, then the fuel injectors, the engine ECU, or the associated wiring have a problem.

 

My prior post said that the camshaft position sensor is mounted on the cylinder head near the inverter.

The crankshaft position sensor is located near the crankshaft pulley.

 

Prii will run if you disconnect the camshaft position sensor. You will likely get a P0340 code.
A bad crankshaft position sensor could cause a no start, usually with other codes then P0190.
This is a crankshaft position sensor:


This is one that failed, you can see the oil leaking through the pin on the right side.


Avi

 

Very hard t0o measure fuel pressure as pump is not on long during start up. To prevent the very thing your saying about having fuel in the exhaust etc... So it does not flood the cylinders. Hard to measure on fuel rail on a non running car as it will show low pressure and send you erroneously in that direction. You must jump out fuel pump relay and force it on. Been there done that.

And as far as sensors being irrelevant they fail all the time but i conditioned my post about them by saying if ITS NOT fuel related it may be sensors because the prius like most modern cars show these sensors in dead engine trouble tree's quite prominently.

By the way OP in USA auto parts stores will loan you fuel pressure gauge for free. Hope same for you. Hook to fuel rail and jump out pump relay. Make measurement brief.
Good Luck!

 

If you used an external battery did you connect the correct way round if not the fuel pump will pump backwards.

 

Well, the next step might be to remove the fuel line at the fuel pump, attach a temporary hose to the fuel pump running to a large glass jar or other suitable container, and see what happens when you momentarily energize the fuel pump. If you don't see any fuel being pumped then you know either there is no fuel in the tank or the pump is not pumping even if the fuel pump motor is running. If you do see fuel being pumped then there is something wrong with your fuel line running to the engine compartment - maybe a kink in the metal line caused by the line impacting something hard?

You must be very careful with this process because if you create an electric spark which ignites fuel vapor, you and your Prius may become a barbeque.

An alternate, potentially safer approach, would be to remove the fuel pump from the fuel tank, and have the fuel pump attempt to circulate a less volatile fluid, such as kerosene. At the end of your test, if you decide the pump can be returned to service, make sure all of the kerosene is out of the pump before you reinstall it.