2007 sedan fuel pump not running and check engine light

[Edmond]

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!

[CTScott]

Originally Posted by Edmond

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!

The C/OPN relay is just an ignition switched power relay that only switches power to the fuel pump, so you could indeed bypass it with a relay.

The coil would be fed by 4B-9 (+12) and 4E-5 (ground switched by the ECM).
The contacts would be connected to 4B-11 and 4A-8.

As one final test to verify if the C/OPN relay is the problem or if the ECM is, check the voltage 4B-9 and 4E-5. If they are both 12 volts, then the ECM is not bringing 4E-5 to ground to complete the circuit for the relay coil.