Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 1072, Engine Compression Brake Output #1 – MID 128 PPID 122 46 Type of fault FMI Description: Fault Condition: Possible Symptoms:
Possible Cause FMI 1 • Data valid but below normal operational range - Most severe level • Below range • No Engine Compression Brake • Low engine oil temperature FMI 3 • Voltage above normal, or shorted to high source • Short Circuit + • Yellow electronic malfunction lamp illuminated • Engine Compression Brake can not be turned on • Engine brake function derated • Gear shift performance derated for some automatic transmissions • Faulty Engine Compression Brake actuator • Faulty harness FMI 4 • Voltage below normal, or shorted to low source • Short Circuit - • Yellow electronic malfunction lamp illuminated • Compression brake can not be turned off • Engine stops running • Engine impossible to restart • Faulty Engine Compression Brake actuator • Faulty harness FMI 5 • Current below normal or open circuit • Open Circuit • Yellow electronic malfunction lamp illuminated • Compression rake can not be turned on • Engine brake function derated • Gear shift performance derated for some automatic transmission boxes • Faulty Engine Compression Brake actuator • Faulty harness