Originally Posted by toyomoho

Check if the injectors are receiving DC power.

Each injector has two wires, one wire always receives power when the ign switch is on. The other wire is the ground wire to complete the circuit. This wire runs to the computer.

The computer activates the injector by completing the ground wire circuit.

Power wire might be Black/Orange or White/Red.

Ground wires Yellow, White, or Red/Black.

Note: more then one injector may have the same ground wire as the injectors can be wired to operate in pairs.