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MerCruiser PCM-555 EFI
Page 36
Fault Seconds
When critical faults occur and remain active the PCM-555 keeps track of how
many seconds the fault has persisted during engine operation. The type and
number of critical faults this function keeps track of is pre-selected by the engine
manufacturer. All PCM-555 faults do not have an associated “Fault Second”
counter assigned to them, only a select number of fault types are kept track of.
To view Fault Seconds information select the “Fault Seconds” menu option. A
list of fault types will be displayed showing how many seconds each fault type
persisted.
Erase Fault History
Selecting this option from the Fault History menu will erase the PCM’s Fault
Second data and Freeze Frame Memory data. If active faults are present the
PCM’s Freeze Frame Memory may immediately repopulate with current active
fault information.
RPM History
PCM-555 control modules have the ability to record the number of hours an en-
gine has been operated within a predetermined set of RPM ranges. These ranges
are set at the factory and allow a service technician to view a profile of how a par-
ticular engine has been operated. Upon selecting the RPM History menu option
a list will be displayed showing the hours accumulated in particular RPM ranges.
Use the
▲
and
▼
keys to scroll through the RPM History data. Press the NO
key to return to the PCM History menu.
Erase RPM History
Selecting this option from the Fault History menu will erase the PCM’s RPM
History data. Accumulated hours in all of the RPM History’s ranges will be reset
to zero. This function DOES NOT erase total engine operating hours.
Total operating hours are displayed when initially selecting a system type using
the “Sterndrive / Inboards” selection from the scan tool’s main menu. Total
engine operating hours cannot be cleared and reflect the total run time for the
life of the engine.