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How to jump Fp/B+ terminals?

  #1  
Old 06-26-2018, 09:31 PM
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Default How to jump Fp/B+ terminals?

I've seen a lot of posts discussing jumping FP and B+ terminals to test your fuel pump because it bypasses the relay and MAF sensor. But can someone please explain, in simple, practical terms how to do this on a 2002 Camry SE? First off, where, precisely is the diagnostic connector that has these terminals (under the hood, etc.)? Most of the posts I've seen look like they are from older vehicles with pre OBD-II diagnostic connectors. Can that only be done on older vehicles?
 
  #2  
Old 06-27-2018, 10:28 AM
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The 2002 does not have the FP connector.

Access fuel pump wiring connector on top of tank, then apply 12 V. Remove lower rear seat and chassis access plate to top of fuel tank. Blue/black wire.
 
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Old 06-27-2018, 07:35 PM
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Ok. Thanks so much. So, I jumped the C/OPN relay and the fuel pump kicked in and the car started up and idled (a little rough, but I attribute that to relearning the idle after removing the neg battery cable) until I turned it off after about 5 min. It was low on gas, so I put about four gallons in. Then when I went to start it up with the slightly fuller tank, I jumped the relay again, but nothing. No whirring, no start up, etc. I checked the voltage to the electrical connector housing (blue/black=positive, thanks!) and it read normal, battery voltage. I then connected the car battery directly to the corresponding terminals on the fuel pump assembly via a set of jumper cables through the window and a few wires with little connectors. I got no discernible movement from the pump. I even checked the voltage directly at the two terminals on the pump to confirm that they had battery voltage.

This seemed pretty definitive to me that the pump is the issue and I had just witnessed the last gasp of it, but I wanted to check: Is there anything I could be missing? I got a full ~12.6V at the pump through the circuit and then directly from the battery, which seemed pretty conclusive. But I didn't know if there's some other signal that could be telling the pump not to run. It's just odd that it ran for 1500 miles (since I first started having starting problems and a 0171 code) and never cut out on me once the car had started. Thanks again for all your help.
 
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Old 06-27-2018, 07:39 PM
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i.e. Is it possible that the fuel system was already at max pressure and so applying the battery directly to the fuel pump wold trigger it to turn on?
 
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Old 06-28-2018, 05:13 PM
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There no high pressure off/on switch for the fuel system. Only engine cranking and running requirements to work (or bypass hot wire to pump).

The fuel pressure regulator adjusts pressure.
 
  #6  
Old 06-28-2018, 05:19 PM
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Ok. Thanks. So do you think my assessment is accurate then?
 
  #7  
Old 06-28-2018, 06:38 PM
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Unless the pump is broken or wiring issues. Applying +12V power directly to the fuel pump wire will turn it on.
 
  #8  
Old 06-29-2018, 08:49 AM
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Ok. Thanks for your input. Planning on changing the pump today and I'll get back with the results.
 
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