P3193 and P0A0F code

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How much gas is in the tank?

 

The motors in a Prius transmission are so much more powerful than a conventional car starter motor that people very often think the engine started and ran for several seconds when it was only being cranked, using up battery charge, and never starting at all.

Both trouble codes indicate that. P3193 is a didn't-start code from the ECM (the module directly in control of the engine). It would be P3190 or P3191 instead if that module thought there was fuel in the tank.

The ECM gets the "is there fuel in the tank?" signal from the combination meter in the dash, so you can get P3193 if the meter isn't working, or the communication between the two isn't working, or if the battery was disconnected for a while and the meter is still blinking the fuel bars because it hasn't re-figured-out how much fuel there is yet.

Mind, none of this changes the basic fact that the engine didn't start. The fuel signal only influences which particular code gets shown you because of that.

The P0A0F is also about the engine not starting, it's just from a different module in the car. The HV ECU is like the orchestra conductor for the whole car, and P0A0F is "hey, I gave the cue for the engine, so what happened?".

 

As per explanation from @ChapmanF the symptom is engine won't start. At this stage you have a limited amount of times you can try to start the hybrid battery before you have to hook a high voltage charger up to the battery to try again.

 

Perform the necessary verification procedures according to the manual.

 

Well, P3193 tells you two things:

1. The engine won't start.
2. The ECM thinks maybe that's because there's no fuel in the tank.

There are ways the ECM could be wrong about (2). It ain't wrong about (1). The more important issue is (1).

So, if there could be any doubt in your mind there's enough fuel, go ahead and add 3 or 4 gallons and see if that improves anything.

On the other hand, if you're positive there's half a tank and the car is just wrong about (2), then make a note to yourself about that and keep troubleshooting (1), like anybody troubleshooting a gas engine that won't start. Once that's solved, you can always go back and explore (2) and see if maybe there's some reason the gauge reading isn't right. That isn't why the engine won't start.

Thanks! At the risk of giving the trick away:

Toyota Service Information and Where To Find It | PriusChat

 

Do not attempt to start until you have "fixed the problem". This system uses the HV battery and motor to "crank" (spin) the engine at 1000 RPM. Each time you deplete the HV battery some. If it gets down to 1 bar on the MFD, then you will be stuck, as very very few shops can charge the HV battery.

Besides adding fuel, I would suggest removing the air filter housing and clean the throttle body bore. Black deposits buildup when the throttle is closed and the engine cools down.

These restrict airflow at "idle conditions". The ECM can open the throttle slightly more to compensate, until it reaches a limit. Then it can't compensate.

So I hold the throttle open and use a rag with "throttle cleaning spray" (or some brake clean) to rub - scrub the deposits until the bore is shiny.

Also I use MAF cleaner (or brake clean) on the sensing elements in the MAF sensor. The elements are fairly fragile. Here's a view looking from "the bottom" of the MAF.

Posted via the PriusChat mobile app.

 

Clean the spot shown in the picture (which is the MAFS). You cleaned the air temperature sensor which is on the outside of the unit.