Since around 2022, there have been multiple reports of the Cummins QSL9 engine platform experiencing issues with shorted injector leads that lead to de-rated engine performance. Turns out, the issues are easy to mitigate by simply re-positioning the injector tab leads so that they better clear the injector. This is a simple DIY fix that can be performed by anyone.
Below id the fault typically seen by the operator:
FAULT: Injector Solenoid Driver Cylinder #X Circuit Current Below Normal or Open Circuit
To resolve the issues, locate the cylinder that the fault alarm is pointing to and simply raise the tabs off of the injector to resolve the short. In best practice, it would be prudent to raise the tabs of ALL the injectors to avoid future injector issues.
Possible Fault Codes:
- FC 322, SPN 651 FMI 5 — Injector Solenoid Driver Cylinder number 1 Circuit Current Below Normal or Open Circuit
- FC 331, SPN 652 FMI 5 — Injector Solenoid Driver Cylinder number 2 Circuit Current Below Normal or Open Circuit
- FC 324, SPN 653 FMI 5 — Injector Solenoid Driver Cylinder number 3 Circuit Current Below Normal or Open Circuit
- FC 332, SPN 654 FMI 5 — Injector Solenoid Driver Cylinder number 4 Circuit Current Below Normal or Open Circuit
- FC 323, SPN 655 FMI 5 — Injector Solenoid Driver Cylinder number 5 Circuit Current Below Normal or Open Circuit
- FC 325, SPN 656 FMI 5 — Injector Solenoid Driver Cylinder number 6 Circuit Current Below Normal or Open Circuit
