SPN 3490 FMI 7 Fault Code [Explained]

SPN 3490 fmi 7 fault code means means a problem with air purging in the 7th injector and that the system is not responding with ahi module.

This fault code means a component has failed.

You should test injector for flow, if ok then replace the ahi module.



SPN means suspect parameter number. It is a diagnostic fault code.