A5: Check Injector Feed Continuity

Remove relay PI main relay.
Measure the resistance between pin 5 PI Main relay socket, and in turn, the injector connectors: PI007/002, PI008/002, PI009/002, PI010/002, PI011/002, PI012/002, PI013/002 PI014/002.

Is the resistance < 0.5 ohms?

Yes
Go to A6 A6: Check Fuse to Relay Continuity
Do not replace relay

No
Repair the harness between the appropriate connector, splice PIS02 & pin 5 PI Main relay socket. Test the system for normal operation.