Hi, having a problem with my rav4 and I can't for the life of me figure out the issue.

​

One of the main symptoms is that the Fuel Pump won't spin up and according to the wiring diagram of the fuel pump control, the ECU needs a signal from STA (neutral switch, confirmed working) and NE (Crank Position Sensor, confirmed at least reading a resistance). The tachometer doesn't move when the car cranks, but like I said, the problem is intermittent and sometimes it does.

​

The main part I am stuck on RN is figuring out the operation of the C/OPN relay. I can confirm the relay works, but the coil end only gets 5V on average. When the car does actually run I can measure 12V across the points with the relay removed, only dropping back down to 5V when the engine stops rotating. I actually did get it running but then I disconnected the CPS at the engine and then it just stopped working. I have checked its connection to my ECU and it does register 1300 ohms at the ECU main board, so there is definitely a connection. I suspect its something to do about the CPS signal as the C/OPN relay is controlled by the CPS and the STA signal's enabling a transistor. I can also confirm that the IG2 relay does close as I can measure 12V from the battery to the FC ECU pin.

​

I really don't know what else to do, I have an extra sensor but I like money more than having things I don't need and I would like to confirm that I do not need to install a new sensor.

​

Anyone's help would be extremely appreciated, I will try to answer as quickly as I can.

​

Thank you all so much!