Typically, the first category of code is generated when the signal for the circuit is outside the range of the sensor. The failure mode identifiers can be divided into two categories:Ĭodes that indicate that a problem with an electronic circuit or an electronic component has been detectedĬodes that indicate that a system event has been detected The failure mode of the DTC is determined by evaluating the electronic signal from the suspect circuit. This text description is used to describe the SPN – FMI. The ECM / ECU also attaches a text description to the message that is transmitted over the J1939 data link. The codes are displayed in the form “SPN – FMI”. The FMI may also indicate that an abnormal operating condition has been detected. The FMI may indicate that a problem with an electronic circuit or an electronic component has been detected. The FMI is used along with the SPN to provide specific information that relates to a diagnostic trouble code (DTC).
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