Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 4813, Engine Oil Thermostat Bypass Valve Opening – MID 128 PSID 72 ECM SPN 4815, Engine Cooling Fan Thermal Switch Position – MID 128 PPID 333 82 FMI 3 • Voltage above normal or shorted to high source • Short to battery in metering line • Yellow electronic malfunction lamp illuminated • Faulty harness FMI 5 • Current below normal or open circuit • Open in the metering side sensor circuit • Open circuit in the ground line sensor circuit • Yellow electronic malfunction lamp illuminated • Faulty sensor • Faulty harness Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted + • Yellow electronic malfunction lamp illuminated • Oil thermostat is always open • Faulty actuator • Faulty harness FMI 4 • Voltage below normal, or shorted to low source • Circuit shorted – • Yellow electronic malfunction lamp illuminated • Oil thermostat is always closed • Engine may overheat • Faulty actuator • Faulty harness FMI 5 • Current below normal or open circuit • Open circuit • Yellow electronic malfunction lamp illuminated • Oil thermostat is always open • May have increased fuel consumption • Faulty actuator • Faulty harness Type of fault: FMI Description: Fault Condition: Possible Symptoms:
Possible Cause: FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted to battery • Yellow electronic malfunction lamp illuminated • Faulty harness • Faulty harness connector • Faulty sensor