1` 4 5 and 8 come from the same terminal ( # *****) at the ecm .that is the tan/orange wire -this is the ground(pulsating ) source for those injectors .
The injector will show bat positive on both wires when the wiring is connected to the injector with the key on.
the only thing that would cause those injectors not to work is a bad ecm !
and maybe a shorted injector -which is possible also...
you can use an ohm meter and check the resistance of each of those injectors is should show around 12.0 -17.0 or so for each on
when you measure the resistance make sure the injectors are disconnected (wiring connector )
or you can disconnect the injectors and check the continuity between the tan/red wire and the tan /orange wires of the connectors .
also, you can check the continuity from the tan/orange wire at the injector to the ecm terminal # *****
if the resistance shows bad on one of the injectors or more then those a bad
if the continuity is bad from the wiring at the connector to the ecm then it is a wiring issue
if the continuity is showing between the tan/orange wire and tan/red wire at the injector (1458) disconnected then the ecm is at fault ..
I am sure you will find one of these things is not right .-but usually if you had an injector wire shorted on one of those injectors that the ecm is fried ..thank you ..jazzmaster ..