probably gonna want to check for signal at the ecu(P28).

A1-INJ1 INJECTOR#1 Brown, Battery Voltage with KOEO
A2-INJ4 INJECTOR#4 Yellow, Battery Voltage with KOEO
A3-INJ2 INJECTOR#2 Red, Battery Voltage with KOEO
A5-INJ3 INJECTOR#3 Blue, Battery Voltage with KOEO
A7-FLR1 fuel pump Grn/BLK, Battery Voltage with KOEO

If all that ^^^ tests out ok, check fuel pressure at fuel filter.

hope this helps