TM 5-3805-290-23-1
HOW TO USE ON-BOARD DIAGNOSTICS - CONTINUED
0005 00
FAILURE MODE IDENTIFIERS (FMIS)
0005 00
427-B1894
Table 1. Detailed FMI Explanation.
FMI
DESCRIPTION
EXPLANATION
00
Data Valid but Above
Every electronic control system sets a high limit for expected signal operating ranges.
Normal Operating
This high limit includes over-range signals. A sensor that is still operating but sending
Range (may need
a signal above the expected limit will cause an FMI 00 to be stored. Some possible
causes of an FMI 00 diagnostic code are:
Signal is above normal.
Signal is shorted to +batt.
Sensor needs to be calibrated so that a PWM signal at a duty cycle
of 80 percent is a valid signal. If a PWM signal has a duty cycle of
81 percent, the sensor is still working, but the sensor signal is
above expected signal limits.
01
Data Valid but Below
Every electronic control system sets a low limit for expected signal operating ranges.
Normal Operating
This low limit includes signals under the lower limit. The sensor is still working, but
Range (may need
sending a signal below expected limit will cause an FMI 01 to be stored. Some possible
causes of an FMI 01 diagnostic code are:
Timing is retarded.
Signal is below normal range. A PWM sensor is not expected to
generate a PWM signal below a duty cycle of 5 percent with zero
air pressure. If the sensor generates a signal with a duty cycle of 4
percent when the engine is shut down, the sensor is still working
but sending a signal below the expected limit, which will cause an
FMI 01 to be stored.
0005 00-6
