2020 tacoma p0306 p0305

Hi guys! Any help will be really appreciated; i got a 2020 tacoma v6 with codes misfire; swap coils from 5 and 6 ; replace plugs ( they were black) seems like running rich . What is driving me crazy is the fact that low pressure is about the dame as target it ! But high pressure target at idle is 340 psi; actual high pressure is around 100 psi more ; no problem there; the problem begings when actual high pressure begins to climb ; after 1000 psi truck starts (feels) missing; all at idle; target stays the same(340 psi) but actual high pressure on scanner shows up to 3500 psi!! There is when the misfire on 5 and 6 feels !! I’m lost and will love some fresh ideas ! Thank you all in advance !
Another thing I noticed is with key on engine off , high pressure on scanner keeps going up !! Swap o2 sensor, and try a crank sensor ( my friend idea) still same problem, lean b2;mis 5,6; air fuel ratio lmbalance

 

You already have a thread open for this issue here: https://www.tacomaworld.com/threads/2020-tacoma-p0306.822652/

Perhaps post an update on that thread for continuity purposes.

 

Yes i,m trying, but i am new on this; and the more i played with truck the more confuse i got !

 

I been trying to load scanner data and pictures, but can’t figure out how yet !

 

Sometimes the dealership is your best bet for hard diagnostics, those techs see common issues every day and have all the access to the engineers to help them

 

Yeap, I totally agree; but dealerships at least here ( kirkland wa ) they are back up to over a month waiting !

 

Here are pressure values with key on before the crank.
Can you pull fuel trims?



These are areas to check. If only 2 cylinders, I would check compression.

rule out MAF


Rule out coolant sensor



What kind of scanner do you use?

 

I’m using autel scanner! When high pressure is about 900 psi truck runs fine ! It’s only when high pressure climbs over 1000 to sometimes 2500 psi

 

Can you see injection mode on the scanner when misfires?

 

Do you have codes for this?

 

Yes i do ! P0306 p0305 ; P0174 lean bank 2; number 5 and 6 cylinder air fuel ratio imbalance

 

Im thinking about how to see injection mode !

 

Toyota has spesific codes for imbalance:
-P219xxx for Direct injection
-P11Exxx for Port

 

Yes, im not sure what kind od fuel injection system it has! I see a high pressure fuel pump; and normal injectors on top !

 

https://youtu.be/_KMyfpop9Fs?si=I2y1GSo7sJ6escGJ

 

Thank you !

 

Do you see freeze frame option in your scanner? Do you see this PID in your scanner/Freeze Frame data?


Basically, you need to see under which injection mode you get misfires.

If Port only, check low pressure fuel pressure, probably the faulty low pressure fuel pump.
If no misfires under Port, this is what they want you do check.


B - check you plugs and see if you are getting a spark. did you install OEM plugs?
C- check your intake for leaks.
D- replace direct fuel injectors.

A - compression check, MAF check, timing. etc.

 

Thank you ! I’ll check scanner data now that i know the fuel system !!