P3191 and P0A0F/204

okay sooo... turns out the fuel pump is good... i read once there is a newer ecu that has more time to allow the system to balance itself out versus throwing these codes. For the life of me I cannot find the thread with the specific ECU number... or is it a calibration id I need to apply?

 

hahaha, I'm definitely not giving up... too much riding on getting this thing running.

I did sign up for TIS and nothing was there, will check NHTSA! Thanks for the tip on NHTSA.

 

kid you not.. in the two day membership, entered in the vin and all.. either I'm blind or I couldn't find it on the site.

have you ever performed a ECU update? I've been trying to see if Techstream is all id need or is it just easier to find one with the updates already provisioned then swap it in.

I'm also considering wiring up a switch and relay to the connectors on the fuel pump relay so I can have manual control of the fuel going to the engine to see if I can get it started that way.

edit: I just found the below document on the NHTSA site... looks simple enough and its why I didn't find it on the actual website. It appears its through Techstream.

https://static.nhtsa.gov/odi/tsbs/2019/MC-10164330-9999.pdf

 

ohhhh... soo.. small update... I started from the beginning by checking power to the pump, when I removed the connector from the tank, I noticed the #3 pin was bend and basically not going into the connector. I applied power to test it and it didn't work.

so I went and bought another used gas tank and before installing it, went to test it. When the 14v from a Prius Prime 12v battery when it was on didn't work after sometime I ended up trying it with a 12v putting out 12.33V. the next thing you know she was squirting with a nice stream. I proceeded to test the tank still in stalled and you know what... it was working!

Thats why now I was thinking its the ECU needing to have the latest calibration update installed. This time, versus me hearing what sounds like the RPM gradually increasing before the red triangle of death and the care pops out of ready mode... the car had a more steady or normal room sound yet it still threw red triangle only this time Ready was still active.

https://black.jmyntrn.com/wp-content/uploads/2024/09/2009_Prius_1NZ-FXE_JTDKB20U293466431_9-4-2024-63330-AM.csv

that's the file from my techstream as of yesterday.

 

okay hold on... sounds like you are saying the motor I have in there is bad... the jdm motor that I just installed.... hahahahahahaha you know, I tell people the last few years I've been doing this prius stuff... its like someone has a voodoo doll of me and they are a powerful force. I just wonder if the doll is bald like me or if it has hair.... woooo sahhhh...

so no bangs, leads me to think I should put new spark plugs in! Ive just wanted to get it started and running then I planned on swapping in new plugs, injectors and the rest of the sensors. What should the short fuel trim be at?

 

ahhhhhh, I see said the blind man! I'm putting focus on fuel and will get a pressure tester and more than likely some new injectors then head back to the car here shortly.

 

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well I did replace the throttle body with one from auto dismantlers and cleaned it out. The resistance on the MAF and TB two electric parts all checked out... but oxygen sensor behind the engine? you mean the one on the cat that you changed from inside the cabin? if sooo... that's one I haven't checked, it came with the catalytic converter that was installed...

 

https://black.jmyntrn.com/wp-content/uploads/2024/09/2009_Prius_1NZ-FXE_JTDKB20U293466431_9-7-2024-63430-PM.csv

well i know injectors work and clicking. three above 90% and one at 100%.

pump is working. i turned it on and off while recording in techstream then left it on to sit snd error out. earlier it didnt and got past the 10sec error but then when the motor came on it errored out again. now its poor engine power whuch baffles me

 

So, it turns out that a full bottle of Marvel Mystery Oil may have been added to the gas tank some time ago. I powered the fuel pump and drained the fuel through the front of the car. Afterward, when I tried starting the car, the dash displayed "Fuel Tank Empty." I added new fuel, which was weeks ago.

During the engine installation, the fuel line in the engine bay was accidentally damaged from excess pressure while removing or setting the engine. After several failed attempts to repair it, I found a replacement fuel injector hose at a VW garage (since they use metric). I secured it with two twist clamps on each end and proceeded to attempt starting the engine.

When I pulled the injectors, the fuel didn’t have a strong gasoline smell, and there was some oil residue but not much. I powered the fuel pump to let some fuel flow. Notably, when I removed the injectors, I heard a good pressure release. I started suspecting that maybe the fuel had gone bad, even though it was recently added after installing the tank. I added half a can of Seafoam, an octane booster (7 points), and some fresh gas into the throttle body and tank.

When I tried starting it again, the car sputtered a lot more, especially when I put it in reverse. I even saw a bit of white smoke from the exhaust. But once again, after a few seconds, the red triangle came on, and the car shut off. It sounded like the RPMs were gradually increasing just before it shut down.

Here’s another thing: when the fuel dries, it crystalizes. After this last attempt, I noticed fuel crystalizing near the repaired section of the fuel line where I hadn't secured it with a second clamp (since I didn’t have a heat gun to properly fit the hose over the pipe). Thinking this was the issue, I drove home (~27 minutes) to grab my heat gun, came back, and properly secured the clamps. I added more gas to the throttle body, but the same error codes appeared.

Even if I get a fuel pressure tester and the pressure is off, I’m starting to think I might need to replace that metal fuel line entirely to restore everything to OE spec without relying on my temporary fix.

This is how the repaired line looks now..
https://black.jmyntrn.com/2024/09/09/fixing-the-gas-line-in-my-2009-prius/?utm_source=priuschat&utm_medium=BJpaste&utm_campaign=commentlinkSeptember2024


after uploading the logs to AI... this was its suggestion.


Based on the logs and information you provided:

Key Observations:

1. Fuel Pump Status:
   
   • The logs show that the fuel pump status is recorded as “OFF” in some instances. Ensure the fuel pump is being activated correctly during the start-up process. If it’s not turning on when it should, it could be due to a fault in the fuel pump relay or wiring.
2. Throttle Position Sensor (TPS):
   
   • The readings for the TPS from the logs might indicate inconsistent values, especially when comparing them to expected ranges. This could suggest that the throttle body or sensor is not functioning correctly, affecting engine start-up and performance.
3. Error Codes:
   
   • P3191 (Engine Does Not Start): Indicates issues with starting the engine. This can be due to fuel delivery problems, throttle issues, or other related components.
   • P3190 (Poor Engine Power): Suggests that the engine is not generating the expected power, which could be linked to fuel delivery or air intake issues.
4. Voltage Readings:
   
   • The voltage readings from the logs suggest that the battery and charging system are providing adequate power, but you noted fluctuations. Ensure that the voltage levels are stable and within the expected range for proper engine operation.

Next Steps:

1. Verify Fuel Pump Operation:
   
   • Double-check the fuel pump activation by testing it with a known good power source. Ensure it turns on and operates as expected.
2. Inspect Throttle Body and TPS:
   
   • Recheck the throttle body and TPS for proper operation. Ensure that they are clean and that the sensor readings are within the specified range.
3. Clear and Monitor Codes:
   
   • After making adjustments or repairs, clear the DTCs and monitor if the error codes return. Track any changes in engine behavior and DTC appearances.
4. Additional Testing:
   
   • Test the fuel injectors and verify fuel pressure to ensure that the fuel system is delivering the correct amount of fuel to the engine.

The logs provide a snapshot of the vehicle's status and highlight areas where further investigation is needed. Addressing these specific components should help in resolving the engine start and performance issues. Let me know if you need further details or assistance.