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FAILURE MODE IDENTIFIER (FMI) CODES ON J1939 DATA LINK

The FMI is used along with the SPN to provide specific information that relates
to a diagnostic trouble code (DTC). The FMI may indicate that a problem with an
electronic circuit or an electronic component has been detected. 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.

The failure mode of the DTC is determined by evaluating the electronic signal
from the suspect circuit. The failure mode identifiers can be divided into two
categories:

Codes that indicate that a problem with an electronic circuit or an electronic
component has been detected

Codes that indicate that a system event has been detected

Typically, the first category of code is generated when the signal for the
circuit is outside the range of the sensor.

The second category of code indicates that the sensor signal is OK, but the
signal is outside the normal operating range of the parameter.

Refer to the troubleshooting guide for the specific product. The troubleshooting
guide procedure will help determine the root cause of a DTC.

FMI Description 0 High – most severe (3) 1 Low – most severe (3) 2 Erratic,
Intermittent, or Incorrect 3 Voltage Above Normal 4 Voltage Below Normal 5
Current Below Normal 6 Current Above Normal 7 Not Responding Properly 8 Abnormal
Frequency, Pulse Width, or Period 9 Abnormal Update Rate 10 Abnormal Rate of
Change 11 Other Failure Mode 12 Failure 13 Out of Calibration 14 Special
Instruction 15 High – least severe (1) 16 High – moderate severity (2) 17 Low –
least severe (1) 18 Low – moderate severity (2) 19 Data Error 20 Data Drifted
High 21 Data Drifted Low 31 –




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