Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 639, SAE J1939 Data Link 1 – MID 128 SID 231 ECM SPN 641, Engine Variable Geometry Turbocharger (VGT) Actuator 1 MID 128 SID 27 37 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 2 • Data erratic, intermittent or incorrect • SAE J1939 high or low circuit shorted + • SAE J1939 high or low circuit shorted – • SAE J1939 high or low circuit open • MIL illuminated • Faulty harness or connector Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 0 • Data valid but above normal operational range - Most severe level • Engine Variable Geometry Turbocharger (VGT) actuator temperature out of range • Possible Red engine shutdown lamp illuminated (dependant on severity) • Yellow electronic malfunction lamp illuminated • Possible engine derate • N/A FMI 2 • Data erratic, intermittent or incorrect • Engine Variable Geometry Turbocharger (VGT) actuator has not seen a valid command on CAN2 data link • Incorrect data • MIL illuminated • Yellow electronic malfunction lamp illuminated • Low boost • Low power • Nozzle opens • Smoke from engine • Disturbance on CAN2 data link FMI 4 • Voltage below normal, or shorted to low source • Short to ground • MIL illuminated • Yellow electronic malfunction lamp illuminated • Nozzle will open resulting in low power and low boost • VGT actuator will continue to attempt and maintain target nozzle position • Faulty VGT actuator connector • Faulty VGT actuator harness • Low battery voltage