TM 5-3805-291-23-1
HOW TO USE ON-BOARD DIAGNOSTICS - CONTINUED
0006 00
FAILURE MODE IDENTIFIERS (FMIs) - CONTINUED
0006 00
Table 1. Detailed FMI Explanation - Continued.
FMI
DESCRIPTION
EXPLANATION
02
Data Erratic,
A signal from a component is present. Control that reads diagnostic information can
Intermittent, or
not read signal properly. Signal appears to be gone, unstable, or invalid. Data can be
Incorrect.
correct or incorrect intermittently. Also, this condition relates to communication
between controls. For example, when monitoring system is looking for engine speed
from 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 limit. FMI 03 most often relates to a
or Shorted High.
signal circuit. Some components that could cause an FMI 03 diagnostic code are:
Sensor or switch is faulty. Somepossible causes of an FMI 03 diag-
nostic code are:
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 opencircuit in sensor signal wire will
cause control to pull up. When this occurs, 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 limit. FMI 04 most often relates to a
or Shorted Low.
signal circuit. Some components that could cause an FMI 04 diagnostic code are:
Sensor or switch is faulty. Somepossible causes of an FMI 04 diag-
nostic code are:
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.
0006 00-7
