Fuel pump relay location

Tiny
THEDY BYSE
  • MEMBER
  • 1997 TOYOTA CAMRY
I am trying to find the fuel pump relay.
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Tuesday, September 28th, 2010 AT 8:51 AM

7 Replies

Tiny
WRENCHTECH
  • EXPERT
The fuel pump relay is in the under hood relay box. It is called a "circuit opening" relay. It is marked CIR OPN.

Here is a guide to show you how to test it:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit


http://www.2carpros.com/forum/automotive_pictures/561653_Fuel_pump_relay_97_Camry_1.gif



Check out the engine and fuel pump wiring diagrams (below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Tuesday, September 28th, 2010 AT 10:55 AM
Tiny
TNBIGFOOT
  • MEMBER
  • 1995 TOYOTA CAMRY
  • 150,000 MILES
Have checked timing belt, in time. Ohmed the two pickups in the distrubitor and they read in spec. Another site showed two relays in the fuel pump circuit, first the EFI relay is pulling in when the key is in the run position. If I am looking at the correct relay (the other site called it the "circuit interrupting relay") in the passenger kick panel med size black relay just to the right of the ECU. I am getting very frustrated at not being able to find out what things might keep the CIR from pulling in.
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Friday, July 20th, 2018 AT 2:15 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
What it is that your trying to fix?
Does the car run?
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Friday, July 20th, 2018 AT 2:15 PM (Merged)
Tiny
TNBIGFOOT
  • MEMBER
The car was not running and I replaced the fuel pump. It started and ran good. After the second start it shut off from 2,000 rpm's and I have checked and rechecked everything I can think of. There is no power to the pump when you turn the key run for the two seconds. I also checked the distributor pickups with an ohm meter and the ohm okay. Also ohmed the coil and it looks okay. Checked voltage at the primary of the coil and no reading when the key is in run or start. Do you know where I could find a schematic for the car? I am pretty good at wiring and troubleshooting need to know how the circuit works.
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Friday, July 20th, 2018 AT 2:15 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
Some of those do not power the fuel pump until they are cranked.

Okay, we have to start from the beginning. I can help you here. Perform these tests and post the results and we will go from there.

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can only be tested during the failure. Any other time and they will simply test good because the problem is not present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That is what we have to look for.

These are the basics that need to be tested and will give us the information required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the positive terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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Friday, July 20th, 2018 AT 2:15 PM (Merged)
Tiny
PAUL2112
  • MEMBER
  • 1998 TOYOTA CAMRY
Six cylinder two wheel drive automatic.

My car quit running the other day at a stop sign. Got it back to the house, checked fuses, all seem good. Removed fuel pump and checked it out of the tank (reattached to wiring still in car), tried to start the car and nothing from the pump. Installed a new pump and still nothing. I believe the C/OPN relay controls power to the fuel pump, checked it, even swapped it with a few others that were the same and still nothing. Car will run if you spray starter fluid so it is getting spark. Also the check engine light never came or anything else. Anything else I need to check? Thanks
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Friday, July 20th, 2018 AT 2:15 PM (Merged)
Tiny
MATHIASO
  • MEMBER
Hello_

It has spark and compression but no fuel based on your diagnosis when spraying a small amount of aerosol starting fluid into the engine and getting it started before it shut off again.
There is no power to the fuel pump/the new fuel pump.
The relay has been replaced.
What you could check is for an open anywhere in fuel pump wiring circuit (power or ground).


http://www.2carpros.com/forum/automotive_pictures/46384_0900c1528009289aq_1.jpg



,
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Friday, July 20th, 2018 AT 2:15 PM (Merged)

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