TM 5-3805-290-23-1
HOW TO USE ON-BOARD DIAGNOSTICS - CONTINUED
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FAILURE MODE IDENTIFIERS (FMIS) - CONTINUED
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Table 1. Detailed FMI Explanation - Continued.
FMI
DESCRIPTION
EXPLANATION
02
Data Erratic,
A signal from a component is present but the control that reads diagnostic information
Intermittent, or
can not read the signal properly. The signal appears to be gone, unstable, or invalid.
Incorrect.
Data can be correct or incorrect intermittently. Also, this condition relates to
communication between controls. For example, when the monitoring system is looking
for engine speed from the engine ECM over CAT data link. Some possible causes of
an FMI 02 diagnostic code are:
There is a faulty connection.
Signal is intermittent or erratic.
Software has been changed.
Signal is noisy.
Signal is out of range.
03
Voltage Above Normal
A component or system voltage is higher than its limit. FMI 03 most often relates to a
or Shorted High.
signal circuit. Some possible causes of an FMI 03 diagnostic code are:
Sensor or switch is faulty.
Wiring harness is damaged.
Electronic control has failed.
A sensor has failed and voltage output is high.
Any wiring harness has a sensor signal wire shorted to a high volt-
age. A high voltage is any voltage greater than sensor supply volt-
age.
A wiring harness that has an open circuit in a sensor signal wire
will cause the control to pull up. When this occurs, the input circuit
is pulled up to supply voltage.
A faulty control will also cause an FMI 03, although this is very unlikely.
04
Voltage Below Normal
A component or system voltage is lower than its limit. FMI 04 most often relates to a
signal circuit. Some possible causes of an FMI 04 diagnostic code are:
or Shorted Low.
Sensor or switch is faulty.
Wiring harness is damaged.
Electronic control has failed.
A sensor has failed and voltage output is low.
Any wiring harness has a sensor signal wire shorted to ground.
A faulty control will also cause an FMI 04, although this is very unlikely.
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