don17 Posted October 6, 2021 Report Share Posted October 6, 2021 New issue with the car, when the engines warm 80-90 degrees. When turning the key to start position, fuel pump continues to pump/prime until started. I have dropped the pre crank times very low still continues to do it? Signs of a bad fuel pump ecu ? Any help appreciated, only started happening recently, Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 6, 2021 Report Share Posted October 6, 2021 The ECU doesnt even control the fuel pump as far as I can see. In our base map there is only aux 2 set up to switch the pump to from low to high flow mode somewhere just above idle, but there is nothing set up to actually turn the pump on/off, and I dont see anything on the pinout. Has the car always done that, or previously ok. Im wondering if our basemap is even set up correct. It almost looks like that aux 2 signal should be some sort of PWM signal. Quote Link to comment Share on other sites More sharing options...
don17 Posted October 6, 2021 Author Report Share Posted October 6, 2021 It has only started doing it recently, which is strange Quote Link to comment Share on other sites More sharing options...
don17 Posted October 8, 2021 Author Report Share Posted October 8, 2021 Also now the fuel pump continues after ignition is switched off for 3-4 seconds? Quote Link to comment Share on other sites More sharing options...
don17 Posted October 12, 2021 Author Report Share Posted October 12, 2021 Is it possible there's a short inside the ecu? I was going to rewire from aux 2 to another aux output and re try, Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 12, 2021 Report Share Posted October 12, 2021 As far as I know, aux 2 only controls whether the pump runs in low speed or high speed mode, it doesnt turn the pump on or off. Do you hear the pump change speed if you set aux 2 to "Test (on)" or off? Quote Link to comment Share on other sites More sharing options...
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