P0a0f-504

Pls has anyone ever come across this kind of code before, while troubleshooting an engine failed to start problem on a Prius 2005, with 254,091miles?

 

The had 1/2 tank of fuel in it. So, I'm just surprised.

 

I got another ECU, to try out with. The car could not start.
The mg1 started briefly, and died within some seconds.
Scanned the car, I got a different code:
P0a0f-525.
I have checked that code on alldata, but can't get anything.
Has anyone come across this specific code?

 

Yes, I'm.
For that code, and checked that online, without success.

 

Thanks for the replies ed! There are other codes truly, which I cleared initially, after replacing some parts.
With that done, I was hoping, that would do the trick.
I had carious codes ranging from p0012 to p0a0f 533, to what I ha e currently (p0a0f 525).
I had checked the valve timing alignments, replaced can/Crank sensors, tested all electrical circuitry from the sensors to the HV ECU to established continuity and resistance (no open or short circuit problems).

My plan was to swap an in erter to see what happens next.

Yeah, the battery is done right now. I'm going to get it charged this week, and continue with the diagnosis.

Thank you so very much for pointing me to the transmission/engine likelihood that it may have seized.

I'd performed that test this week after charging the battery, and observe if the belt moves when I attempt to start it.


Dxta

 

There was oil in the engine. In fact, the owner mistakenly overfilled it by 1.5liters. I had to drain that extra oil from the sump.
The engine rotates, when I was rechecking the valve timing on the engine.

Are you saying in essence that if mg1 turns, and engine also turns, that might suggests that the input damper is bad?

 

Alright, would put that in mind when troubleshooting this week after charging the battery.

What about if there's a turnover of the belt, and it still does not start?

Definitely, I might still get an engine failed to start code.

And would that be something related to the transmission too?

PS: for the 533, I had to replaced the fuel pump, because was so low on pressure.
That took care of that code though.
Fuel was even more than half tank. That's the surprising thing about this whole thing.

 

Hi @edthefox5 . thanks for your previous suggestions.
Opened up the valve cover, and discovered the timing chain slipped of off the sprocket of the exhaust camshaft. That got the timing chain, loosened, and seized the engine. Valves on number one cylinder were bent.

Decided to replaced the engine entirely, instead of carrying out repairs on the damages seen.

Started the vehicle; it came on ready for some seconds, then went off.
Showed checked hybrid system.
Scanned for codes on the engine side, got nothing. While on the hybrid side, I got this code:

P0a0f-205 engine failed to start.
What could possibly be the problem why the ICE isn't kicking in as before, to charge the battery?
I have replaced the HV ECU, and nothing has worked.
I'm leaning towards the transmission system, maybe, mg2 has failed?
Has anyone experienced this problem before pls?

 

Yeah, have tried the old ECU, and still the same thing. ICE comes on for few seconds, then shuts down itself.
No codes, apart from p0a0f 205 for now.