Hello guys,
well, I received the Stage 5 ECU from FWD Performance. I changed the ECU, +40% injectors, 3 bar MAP, etc. and started the engine - everything was fine. I went for a test drive and after cca 10 miles, the car stopped. I heard that fuel pump doesn't work. After bringing the car home, I tested that the fuel pump is working by connecting it directly to a battery. There was no power going to the pump. I found the fuel pump relay and here are my questions. There are 4 connectors, one has all time 12V, than there is cca 2,8V and 12V power after switching the key on, the last one is leading to fuel pump, is that right? Maybe the relay is wrong (strange that it happend just after new ECU mounted), but when I connect directly the "all time 12V" into the empty connector, the fuel pump starts to work, but car doesn't start. The question is if the working of fuel pump is connected to an ECU?
1989 2,2 Turbo II
Thanks a lot in advance.
EDIT:
There is another thing on my mind. When I measured the fuel pump relay, there was: 87 - all time 12V, 85 - switched 12V, 86 - 2,7V and 30 - 0V the last connector which leads to the pump. It's strange that I have some voltage at "86" because there have to be the ground against which is the switched "85" connecting the realy "87" to "30". When I connect directly 87 to 30 the pump works. So I can imagine that the ground on 86 is switched by the ECU, for example in case of emergency (after crash like many cars have) to disconnect the pump. And maybe there are another circuits which are also disconnected, like ignition, injection or something like that. When I connect directly the pump, it works, but other circuits can still be in "emergency" mode, maybe my ECU or the chip inside it is at this emergency mode and that is the reason why it doesn't work. The question is how can I recognise that, how can that happend through the drive and what can I do with it?