K-Series Programmable ECU installation questions / support issues
6 posts • Page 1 of 1
The usual cause is that the car is an engine swap and the swap harness is incorrect, often with reverse polarity to the ECU. This usually is from the ground plane getting elevated to half battery voltage or more. Often the cause is the main relay wiring, or applying power to the main relay or fuel pump relay outputs. A less common cause is from using a laptop with power inverter, where the inverter does not isolate the AC ground from the chassis ground, and there is a large ground current going through the USB shield.
Last thing I wired on the car was the tps sensor. I wired it and scaled it took it back apart to solder all of my connections once done we found this problem do you think this could have been a possibility.
Probably not the TPS, unless it was feeding +12V into the signal ground. It normally is the main relay or fuel pump relay wiring. Possibly also a missing main ground.