The car is currently sitting as I'm waiting for a refurbished turbo to arrive, in the meantime I took the ECU out since I was going to get a chip on there and wanted to see if it's chipped already. Changed the battery and took the fuel pump out to check whether it's an aftermarket one as I was considering upgrading. After my thorough inspections the pump stopped priming when I turn the key
Can't exactly go to start the car to check but I don't it would work as it always primed before.
Checked the wiring, the plug, everything seems connected. I checked the wires with a multimeter and I was reading 12.5V on the red wire and around 7.5V on the green (before the blue plug going to the fuel pump). I also checked the corresponding wires on the other side and it's the same.
I expected to see change in voltage on one of the wires (ECU signal? don't know which wire tho) when I turn the key for when the fuel pump would normally prime but nothing.
Could anyone explain to me which wire is for what and what kind of voltage I should expect to get on them when I turn the key?
The fuel pump worked when I tested it out of the car with a car battery.
I tried jumping the relay (not sure if correctly) by bridging connector 2 and 3 and it still didn't prime.
Tried grounding the fuel pump elsewhere with no luck.
I'm a total noob with wiring, don't know if the wiring is bad or I managed to damage my ECU or something...
Any help to guide me how to diagnose this problem would be greatly appreciated.