CAT 3406E (Prefix 1MM or 2WS) Fault Code: 73 PID: SPN: 4 FMI: 11 Cylinder #4 Injector current fault
The Engine Control Module (ECM) detects one of the following items after attempting to operate the injector:
•A low current condition (open circuit) exists in the wiring for the cylinder injector solenoid.
•A high current condition (short circuit) exists in the injector solenoid.
Probable Causes:
1) ECM Connection/Harness
2) Cylinder injector failure
3) Injector solenoid failure
4) Harness from ECM to valve cover connector
5) ECM failure
6) Injector harness under valve cover
