The Suspect Parameter Number (SPN) is diagnostic fault code terminology found on some Caterpillar ® products using a J1939 CAN data link. The Society of Automotive Engineers (SAE) developed the J1939 standards and SPN code terms have been assigned for specific parameters (component or system circuits) that diagnostic trouble codes (DTC) are associated with. Jan 03, 2016 · 141.1 SPN 3720/FMI 15. This fault indicates that the Diesel Particulate Filter (DPF) has reached the end of its service life and must be replaced. Replace DPF and perform Ash Accumulator reset using DDDL. The DPF lamp will illuminate and SPN 3720/FMI 15 will log when the truck reaches the appropriate mileage interval.
The FMI may also indicate that an abnormal operating condition has been detected. The codes are displayed in the form “SPN – FMI”. The ECM / ECU also attaches a text description to the message that is transmitted over the J1939 data link. This text description is used to describe the SPN – FMI. SPN SAE J1939 FMI Lamp Color MIL Lamp Status J1939 SPN/FMI Description Fault Code Cummins Description 2013 ISX15 2013 ISX12 2013 ISL9 2013 ISB6.7 108 4 None Solid Barometric Pressure Voltage Below Normal, Or Shorted To Low Source 222 Barometric Pressure Sensor Circuit - Voltage below normal, or shorted to low source XX X X 110 0 Red None
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