SDMO RENTAL POWER R550C2 User And Maintenance Manual page 299

FMI=10—ABNORMAL RATE OF CHANGE
Any data, exclusive of the abnormalities covered by FMI 2, that is considered valid but whose data is changing at a rate that is outside
the predefined limits that bound the rate of change for a properly functioning system (outside Region c of the signal range definition).
Broadcast of data values is continued as normal.
FMI=11—ROOT CAUSE NOT KNOWN
It has been detected that a failure has occurred in a particular subsystem but the exact nature of the fault is not known. Broadcast of
data value is substituted with the "error indicator" value.
FMI=12—BAD INTELLIGENT DEVICE OR COMPONENT
Internal diagnostic procedures have determined that the failure is one which requires the replacement of the ECU, used here to mean
the packaged unit that includes some microprocessor and its associated components and circuits. It can be assumed that the
communications subsystem is not the part that has failed, and the manufacturer has determined that there is no serviceable component
smaller than the ECU involved in the failure. Broadcast of data value is substituted with the "error indicator" value if appropriate, as
there may or may not be any broadcast involved. This error is to include all internal controller trouble codes that can not be caused by
connections or systems external to the controller.
FMI=13—OUT OF CALIBRATION
A failure that can be identified to be the result of not being properly calibrated. This may be the case for a subsystem which can identify
that the calibration attempting to be used by the controller is out of date. Or it may be the case that the mechanical subsystem is
determined to be out of calibration. This failure mode does not relate to the signal range definition as do many of the FMIs.
FMI=14—SPECIAL INSTRUCTIONS
"Special Instructions" is the FMI to be used when the on-board system can isolate the failure to a small number of choices but not to a
single point of failure. When the FMI is used, there is clear necessity for the service technician to take some action to complete the
specific diagnosis, and the manufacturer has provided instructions for the completion of that diagnosis. There are two cases where this
will be used: 1. for emission-related diagnostics where the particular failure cannot be separated between a sensor out of range and the
case where the actual value is at the edge of a diagnostic region, and 2. for the older SPN 611 to 615 where the problem is in
determining which of two or more circuits (which may interact) is the one that needs repair.
SPNs 611 through 615 are defined as "System Diagnostic Codes" and are used to identify failures that cannot be tied to a specific field
replaceable component. Specific subsystem fault isolation is the goal of any diagnostic system, but for various reasons this cannot
always be accomplished. These SPNs allow the manufacturer some flexibility to communicate non-"specific component" diagnostic
information. Since SPNs 611-615 use the standard SPN/FMI format it allows the use of standard diagnostic tools, electronic
dashboards, satellite systems and other advanced devices that scan Parameter Groups containing the SPN/FMI formats. Because
manufacturer defined codes are not desirable in terms of standardization, the use of these codes should only occur when diagnostic
information cannot be communicated as a specific component and failure mode.
Possible reasons for using a System Diagnostic Code include:
1. Cost of specific component fault isolation is not justified, or
2. New concepts in Total Vehicle Diagnostics are being developed, or
3. New diagnostic strategies that are not component specific are being developed.
Due to the fact that SPNs 611-615 are manufacturer defined and are not component specific, FMIs 0-13 and 15-31 have little meaning.
Therefore, FMI 14, "Special Instructions", is usually used. The goal is to refer the service personnel to the manufacturer's
troubleshooting manual for more information on the particular diagnostic code. This failure mode does not relate to the signal range
definition as do many of the FMIs. This type of fault may or may be directly associated with the value of general broadcast information.
FMI=15—DATA VALID BUT ABOVE NORMAL OPERATING RANGE - LEAST SEVERE LEVEL
The signal communicating information is within a defined acceptable and valid range, but the real world condition is above what would
be considered normal as determined by the predefined least severe level limits for that particular measure of the real world condition
( Region i of the signal range definition). Broadcast of data values is continued as normal.
FMI=16—DATA VALID BUT ABOVE NORMAL OPERATING RANGE - MODERATELY SEVERE LEVEL
The signal communicating information is within a defined acceptable and valid range, but the real world condition is above what would
be considered normal as determined by the predefined moderately severe level limits for that particular measure of the real world
condition ( Region k of the signal range definition). Broadcast of data values is continued as normal.
FMI=17—DATA VALID BUT BELOW NORMAL OPERATING RANGE - LEAST SEVERE LEVEL
The signal communicating information is within a defined acceptable and valid range, but the real world condition is below what would
be considered normal as determined by the predefined least severe level limits for that particular measure of the real world condition
( Region h of the signal range definition). Broadcast of data values is continued as normal.
FMI=18—DATA VALID BUT BELOW NORMAL OPERATING RANGE - MODERATELY SEVERE LEVEL
The signal communicating information is within a defined acceptable and valid range, but the real world condition is below what would
be considered normal as determined by the predefined moderately severe level limits for that particular measure of the real world
condition ( Region j of the signal range definition). Broadcast of data values is continued as normal.
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