Lexus es300 fuel punp wiring
05-10-21, 10:31 AM
#1
Driver
Thread Starter
Lexus ES300 Fuel Pump Wiring
Can anyone tell me the coding of the wires on my fuel pump plug/pigtail? the 5 wires it has are green, white with black stripe /brown blue and yellow ? I need to know which is the power and which is the ground. Thanks in advance
Last edited by Brian97S; 05-28-21 at 02:09 PM.
05-10-21, 11:02 AM
#2
Lexus Fanatic
see attached file
05-10-21, 11:48 AM
#4
Pole Position
Hello,
You will probably be better off shorting the Circuit Opening Relay (CIR OPN Relay), which is located under the hood and controls the 12V supply to a pump, that way you will both verify that your wiring is good, and supply constant 12V to the pump. Bottom two pins (Pins 4 and 5) of the trapezoidal connector on the fuel pump are the ones that supply power to the pump, short the Switch side of the relay (do not confuse with the Coil side) and see if the pump will engage, if not, verify that you have power on the pump with a test light, not a multimeter, if so, replace the pump, if not, diagnose the wiring with the diagram provided in the LeX2K post.
Hope this helps and best of luck!
You will probably be better off shorting the Circuit Opening Relay (CIR OPN Relay), which is located under the hood and controls the 12V supply to a pump, that way you will both verify that your wiring is good, and supply constant 12V to the pump. Bottom two pins (Pins 4 and 5) of the trapezoidal connector on the fuel pump are the ones that supply power to the pump, short the Switch side of the relay (do not confuse with the Coil side) and see if the pump will engage, if not, verify that you have power on the pump with a test light, not a multimeter, if so, replace the pump, if not, diagnose the wiring with the diagram provided in the LeX2K post.
Hope this helps and best of luck!
The following users liked this post:
Brian97S (05-17-21)
05-10-21, 11:59 AM
#6
Lexus Fanatic
Search pump in the PDF it shows up. Remember, there is only power to the pump when the engine is cranking or running. Key to ON position does not send power. +1 on using a test light (incandescent not LED) a test meter can fool you since it has very high internal resistance, this results in "floating" or "surface" voltage readings.
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05-10-21, 01:16 PM
#10
Pole Position
Hope this helps and best of luck!
05-10-21, 01:39 PM
#12
Pole Position
Why did you pull it out in the first place?
Testing the pump while dry may damage it. I would suggest to put it back in the car and power it from stock pigtail, if the pump is working, you will definitely be able to hear it.
Hope this helps and best of luck!
Last edited by Arsenii; 05-10-21 at 01:43 PM.
05-10-21, 01:44 PM
#13
Driver
Thread Starter
Thanks to all of you that have replied so far I will keep that valuable information .Once again though here is the question I am asking I will be glad to fill in the details later once I am finished .Can anyone tell me the coding of the wires on my fuel pump plug/pigtail? the 5 wires it has are green, white with black stripe /brown blue and yellow
Last edited by Brian97S; 05-21-21 at 09:44 PM. Reason: misspelled info left out
05-10-21, 01:51 PM
#14
Lexus Fanatic
The following users liked this post:
Brian97S (05-10-21)