Before connecting the ECU check the following:

1. Install new spark plugs on engines that was standing for a long time.
2. Service and test the injectors to ensure they all have the same fuel delivery and that the filters on them are clean.
3. First ensure that the installation is correct according to the Hardware Installation manual.
4. Test the electrical wiring with a multi meter according to the Installation Testing Procedure.
5. Power up the fuel pump by loosening the fuel pump positive from the relay circuit and connecting it to 12V battery positive. Check the fuel pressure is around 3.5 Bar and check for fuel leaks. Reconnect to the relay.