420A injector circuit failure?

[daveeclipse99]

my car has been running very rough and i got it tested and it told me injector circuit failure . all my injectors and ran by my stand alone but is only saying cylinder 1 . i have aftermarket rc 750cc injectors that are not even a year old . is it a bad injector or possibly the wiring ? im getting frustrated . any ideas ?

 

[ilco187]

you could try switching the injector to another cylinder and see if it displays different it would be the injector, or if it says the same it could be a wire or electrical problem.