ECU not telling Fuel pump to cut on [Archive] - SR20 Forum

: ECU not telling Fuel pump to cut on

07-11-2009, 03:41 PM

I installed your unit when installing a turbo kit on my car. It worked find, and the car fired up with no issues. Now that I have swapped motors and stuck with a NA setup the fuel pump is not cutting on.

I have trouble shooted the following:

(The pump was orginally didnt get the 12V it needed to start up)

I bypassed the relays and got the car and fuel pump to fire up. However after some extensive tests of the relays, they are working as they should (I pulled the cover off and manuallly tested them).

The continuity of the wire going from the relay to the ECU was check and checked out

Everything is getting voltage as it should

So I am left to conclude that the ECU is not telling the fuelpump to cut on or off.

I am still running my Calum ECU, and to make sure there is nothing ECU I am going to run my stock one tommrrow to see if it comes on.

Is there something I need to check again. I have been using the FAQ threads and factory service manual. I couldnt find anything to specifically trouble shoot the ECU

Thanks again

07-11-2009, 05:56 PM
Yea, swap ECUs and see if it works. If it's the ECU then the fuel pump driver is blown. This is relatively easy to replace- is this a B13 or B14 ECU?

07-12-2009, 12:38 AM

Calum...plugged the stock ECU back in and the fuel pump kicked right on. I wil address the fuel pump issue when I am loading my KA bin file that you emailed me. From your statement it seems like something I can do with the ECU in the car

Thanks again