My Prius dead again, with techstream this time.

I found a TSB on the new IM:
https://www.tsbsearch.com/Toyota/T-SB-0103-12

That TSB mentions improvements to the IM that apply problems with temperatures below -5 degrees C / 23 degrees F. It specifically mentions P0A0F code after a "cold soak", My second incident was a "cold soak" but at a temperature in the 50's F when I got that error. When my wife gets home, I will go out and check the P/N on the manifold in the 2017.

What is not clear is if the improved IM has the Tournament passages.

@jzchen mentions details in this post including part numbers:
https://priuschat.com/posts/3189619/

In that post, @jzchen mentions the new IM part numbers are 17120-37090 or 17120-37091. When I search Conicelli's parts site, they sell the 17120-37091 intake manifold for $212.22, but they don't list any vehicles in the fitment section.

Conicelli lists 17120-37054 as the part number with fitment for all Prius 2010 to 2015, and all Prius v's 2012 to 2017, which is the not improved version. The price is the same $212.22.

 

The cleanout of the IM did not take more than an hour, when you consider I had to remove the IM to replace the PCV at the same time. I was unaware of an "improved IM" when I did the work. I will probably get around to installing an OCC, which will require the IM removal. I'll consider the change then.

I would rather spend the $200 on a Cat guard. A lady near me had her Cat stolen from her Prius while she was grocery shopping in broad daylight!
https://nextdoor.com/news_feed/?post=204639363

 

OK I got a call from the actual Tech.

The same two hoses were off:
1) PCV Valve hose (with a clamp this time)
2) Evap Purge valve hose.

Apparently there is a TSB about the Evap Purge system building up and releasing incredible pressure, enough to blow hoses off of anything connected to the Intake Manifold when the Purge Valve opens. Apparently the two hoses blew off where they are connected to the base of the Throttle Body.

The TSB involves replacing the Purge Valve with a New part specified in the TSB. Also required is reprogramming the ECU to work correctly with the new part. This is not a recall, so the cost is on me.

The Service Manager told me something kind of different when I picked up the car. What he told me is that the tech had found two two hoses were disconnected, and one was missing its clamp. He told me that the tech recommended that I replace the PCV valve (Which I said I had recently done as preventive maintenance), and replace the Purge Valve and reprogram the ECU. I didn't understand the connection to the Purge valve.

The explanation of the purge valve releasing excess pressure into the IM was not communicated to me. The TSB was not mentioned, so I did not understand why the tech thought the Purge Valve change was important, or why reprogramming was involved. The SM wrote down the part number of the Purge valve, and since I had mentioned that I have techstream, I think he was implying I could easily do the work.

I still can't figure out how this relates to "Firecracker Bang" and loss of Power steering 200 feet later. The Tech told me the car is not designed to run very far on electric only. 200 feet on level ground at 25MPH is not very far.

I wish I had asked the Tech if the EGR_FLOW_INSUFFICIENCY might be somehow related. I would expect that the "Min" values on my screenshots would be way off if hoses were loose or off.

 

Got a call from the SM. Cost including second tow is $662 + 6% tax. The part required for the TSB may be hard to find. If they can get it, it will be done tomorrow.

The TSB is 0041-15

https://www.tsbsearch.com/Toyota/T-SB-0041-15

 

Maybe. Still I contend that the bang I heard is not consistent with a hose blowing off. It sounded like a firecracker, and came from under the back of the vehicle. An electrical short would have sounded like a firecracker. It also had a smell that was gunpowder like. Hose blowing also does not explain why I lost so much battery in the 200 feet while traveling 25mph on a level road between when the bang occurred, and the loss of power steering. And the location of the sound is wrong. And, I did not hear a bang a second time it happened.

I have to admit to the sin of possible overfilling. I have had issues with gas pumps that shut off when the tank is only half full on other cars (my minivan is notorious for this). I always give the pump handle one extra squeeze, and if it shuts off right away from the second squeeze, I quit. At least I broke myself of the habit of topping off to the next even half gallon. Having the MPG calculated for me, and paying at the pump with a credit card has broken me of that habit.

 

Reading the TSB, it would be covered under the "CARB" warranty for "180 months or 150,000 miles". I thought PA is a CARB state, but not according to the TSB. Non-CARB warranty is 96 Months or 80,000 miles.

The Part is 25860-37020, and costs around $70