no power to fuel pump, car won't start
05-07-13, 05:53 PM
#16
Driver
Thread Starter
iTrader: (1)
Join Date: May 2012
Location: NJ
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
Ok so I performed a quick test where I hooked up a car battery charger to the positive side of the fuel pump and grounded it out on the chassis and the fuel pump did turn on. Does anyone know if there is a fuse somewhere for the fuel pump itself? I know there's the efi main relay and the efi fuse but I find it hard to believe there is no fuse for the fuel pump itself. If not I'm thinking the ecu is at fault here
05-07-13, 06:01 PM
#17
Fuel pump relay should be under the hood with all of the others. Owners manual will show you. It would make more senses IMO if it was a relay or fuse at fault from when you "may have shorted it out". 
Locate it in the manual, replace it, and hopefully that will fix it.
Locate it in the manual, replace it, and hopefully that will fix it.
05-08-13, 12:16 PM
#18
Driver
Thread Starter
iTrader: (1)
Join Date: May 2012
Location: NJ
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
Fuel pump relay should be under the hood with all of the others. Owners manual will show you. It would make more senses IMO if it was a relay or fuse at fault from when you "may have shorted it out". Locate it in the manual, replace it, and hopefully that will fix it.
Locate it in the manual, replace it, and hopefully that will fix it.
05-08-13, 04:47 PM
#19
Driver
Thread Starter
iTrader: (1)
Join Date: May 2012
Location: NJ
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
Well it turns out I'm an idiot. I ended up blowing the 30 A injector fuse. The moral of this story is pull out and inspect every fuse individually.
But for future reference the 30A injector fuse in the engine bay covers the injectors and fuel pump/fp ecu. So really it should be labeled fuel. Thanks everyone for your help!
But for future reference the 30A injector fuse in the engine bay covers the injectors and fuel pump/fp ecu. So really it should be labeled fuel. Thanks everyone for your help!
06-03-13, 05:54 PM
#21
Well it turns out I'm an idiot. I ended up blowing the 30 A injector fuse. The moral of this story is pull out and inspect every fuse individually.
But for future reference the 30A injector fuse in the engine bay covers the injectors and fuel pump/fp ecu. So really it should be labeled fuel. Thanks everyone for your help!
But for future reference the 30A injector fuse in the engine bay covers the injectors and fuel pump/fp ecu. So really it should be labeled fuel. Thanks everyone for your help!
05-26-15, 04:02 PM
#24
Driver School Candidate
Join Date: May 2015
Location: toronto
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
so i was doing a little maintenance on my sc today and it was idling fine in my driveway after i had just been driving it and it just shut off and now it won't start. it will turn over but will not start. i did the 12v mod and i am not getting power to the fuel pump or the fuel ecu. i tried jumping the fp and b+ terminals on the diag plug and still it will not start and i do not hear the fuel pump priming at all. i tried swapping my efi relay with the defroster relay as they are the same and still nothing. I'm stumped and everything ive read thus far either people get it fired up with the 12v mod, or jumping the pins in the diag. port, or the problem just magically goes away and the car will decide to start. anyone have any ideas? id rather not play the waiting game and hope some gypsy magic decides to get my car running.
06-19-15, 10:17 PM
#25
Driver School Candidate
Join Date: Jan 2008
Location: ca
Posts: 48
Likes: 0
Received 0 Likes
on
0 Posts
It might help if you read my previous posting on this. I included schematic diagram to help with the troubleshooting process. It might not help you now but who knows in the future. You did the right thing but it has to be logical troubleshooting: start with the fuse, next the relay, FP ECU, you do the Fuel Pump last (due to safety concern). When you first turn on the car without the rear seat, you should hear a humming noise coming from the fuel pump (an indication that it is OK). I replaced mine twice already and for both cases, the FP coil was OPEN (infinity/OL).
01-01-21, 02:05 PM
#27
Driver School Candidate
similar problem wit my 03 es300. I've checked with a tester that can send power that the hot line (blue)on the fuel pump is not receiving power. Even sprayed starter fluid directly and jumped it to another running car and it worked but died immediately. Change cam sensor, plugs, even checked compression.
security light is flashing with doors unlocked and opened and locked and closed? Did get a code, P0348. Turned key to ON position and the c/opn relay does not click? swapped it with the horn relay, still dosent click. The horn relay clicks other wise on its own. ... lost
security light is flashing with doors unlocked and opened and locked and closed? Did get a code, P0348. Turned key to ON position and the c/opn relay does not click? swapped it with the horn relay, still dosent click. The horn relay clicks other wise on its own. ... lost
Thread
Thread Starter
Forum
Replies
Last Post
ZGagnon
LS - 1st and 2nd Gen (1990-2000)
32
05-23-14 08:12 PM
mungrin
Performance & Maintenance
6
01-01-14 01:14 PM
