2008 Prius with these codes. I have a correct reading of ohms .7 and with 12v applied to pump connector under rear seat my fuel pressure is 48PSI. I am not getting any fuel pressure when I disconnect my 12v source and try to start the car normally.
You should be getting whatever voltage your car has available in it without an external 12 volt source should power your fuel pump to similar pressure If not you need to find out why You're saying by putting a solid stable 12 volts to your battery like from a jump pack or a battery charger everything works fine I'm assuming the car will start while it's on the jumper so there you go. So when you disconnect the jump box even with the car jumped and running and idling and charging the battery like when it first starts if you put the jump box off of the battery put your tester on the battery not to test load just voltage You're looking for 13.4 14.4 somewhere right in there running and then when you shut the car off it should stay near 12 volts for 7 hours not 11.3 11.1 no sir should be 11.9 to 12 volts If not find out why maybe take the battery to a store with a $4,000 tester like advance Auto or O'Reilly's and see what kind of bill a health you get I bet it may not be so good. That's what you do first before you start miles of troubleshooting and replacing expensive parts which include the 12 volt battery which nowadays are getting close to $270.
I detailed my Prius for about 6 hours doors were open and then this problem came up. 12.16V 346 CCA interstate MTX-S46B24R
Trying to start the car with a jumper pack connected directly to the 12v battery did not fix the issue.
Very little mystery where to focus the next checks. Wiring diagrams are here: Toyota Service Information and Where To Find It | PriusChat
Hook up tec or maybe garage pro. Cycle fuel pump a few times priming system. Slap fuel tank very hard like a bongo drum a few times nothing will break. As fuel pumps she like all electric motors they're current draw rises. Until eventual failure I imagine.
I can send power to my fuel pump with my Autel scanner. I can hear the integration relay clinking. I am still not getting a reading at the fuel pump connector.
Maybe the integration relay is the problem it's getting power but not sending any to the fuel pump but I don't know if it needs to get a signal from a computer which in this car probably is a thing
Sure the relay gets a signal from a computer. That's what makes it click. It clicked, so it got the signal. So this is a job for a multimeter, the wiring diagrams, and checks along the path from the supply side of the relay contacts and along the wiring back to the fuel pump connector.
