2007 sedan fuel pump not running and check engine light - Toyota Yaris Forums

Edmond · 01-07-2014, 03:06 PM

I was able to double check pins 4B-11 and 4A-8. With Key ON, there was 12v at pin 4B-11 and nothing at 4A-8. I threw 12v to the fuel pump and I could here it run. I checked continuity between pin 4A-8 and the black wire at the fuel pump under the back seat and it appears to be the same wire.

I tried to start the car while supplying 12v to the fuel pump to no avail. The car has had this problem since Christmas so It may just need a little motivation with this Negative degree weather we are experiencing here in Kentucky.

I am very familiar with auto electrical systems and my question is, can I bypass the C/OPN relay by using the pins you provided and adding another relay?

I'm sending you my vin for the Junction block part number in case that's the route I need to take.

Thanks again!

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01-07-2014, 03:06 PM	#10
Edmond Drives: 2007 Yarus Join Date: Jan 2014 Location: Kentucky Posts: 6	I was able to double check pins 4B-11 and 4A-8. With Key ON, there was 12v at pin 4B-11 and nothing at 4A-8. I threw 12v to the fuel pump and I could here it run. I checked continuity between pin 4A-8 and the black wire at the fuel pump under the back seat and it appears to be the same wire. I tried to start the car while supplying 12v to the fuel pump to no avail. The car has had this problem since Christmas so It may just need a little motivation with this Negative degree weather we are experiencing here in Kentucky. I am very familiar with auto electrical systems and my question is, can I bypass the C/OPN relay by using the pins you provided and adding another relay? I'm sending you my vin for the Junction block part number in case that's the route I need to take. Thanks again!