0438641 JOHNSON ENGINE COVER ASSY.

Default Settings for the Caterpillar Monitoring System
Setpoint - This is a specific value which can activate a warning and/or a shutdown. The setpoint can be a pressure, a speed, a temperature, or a voltage.Hysteresis - This is the change in the signal from a sensor that is tolerated by the ECM. This is the difference between the setpoint that activates a response and the value that deactivates the response. For example, a warning for low voltage can activate if a value below 20 volts is detected by the ECM. The voltage must rise to 22 volts in order to clear the warning. The hysteresis is the 2 volts that are above the 20 volts.Voltage
The ECM automatically warns the operator of low system voltage. The default settings that are programmed at the factory are listed in Table 1.
Table 1
Voltage Monitoring
Parameter Default Setting
Warning setpoint 20 volts
Warning delay 10 seconds
Hysteresis 2 volts
Security level No required password If the voltage is below 20 volts for 10 seconds, a warning will occur. To deactivate the warning, the voltage must rise above 22 volts.The setpoint can be programmed to a value between 20 and 22 volts.Engine Oil Pressure
The ECM lights an indicator on the instrument panel in order to automatically warn the operator if low engine oil pressure occurs.The strategy is based on a map of the engine oil pressure versus the engine rpm. See Illustration 1. The default settings that are programmed at the factory are listed in Table 2.
Table 2
Engine Oil Pressure
Parameter Default Settings
Hysteresis Map
Activation delay 10 seconds
Security level Required password
Warning setpoint Map
Warning delay 4 seconds
Illustration 1 g00592294
Map of the engine oil pressure versus the engine rpm
(Y) Engine oil pressure in kPa
(X) Engine rpm
(1) Hysteresis
(2) Minimum engine oil pressure If the engine oil pressure is below the minimum pressure for four seconds, a warning will occur. To deactivate the warning, the engine oil pressure must rise above the hysteresis that is set in the map.The map cannot be reprogrammed.Overspeed
The ECM will automatically perform a warning and/or a shutdown if an engine overspeed occurs.The default settings that are programmed at the factory are listed in Table 3.
Table 3
Overspeed
Parameter Default Setting
Warning setpoint 1.09 times the rated rpm
Warning delay 0 seconds
Shutdown setpoint 1.15 times the rated rpm
Shutdown delay 0 seconds
Hysteresis 100 rpm
Security level Required password If the engine speed exceeds the setpoint rpm, a warning and a shutdown will occur. The fuel will be shut off and the air shutoff will be activated.The air shutoff must be reset before the engine can be restarted. Ensure that both of the air shutoffs are reset.Note: If the default settings for the warning and for the shutdown are equal, the warning and the shutdown occur simultaneously. These settings may be selected in order to log both a warning and a shutdown: furthermore, an overspeed condition can occur rapidly.The setpoints can be programmed to a value between 1200 and 2400 rpm.Crankcase Pressure
The ECM will automatically perform a warning if high crankcase pressure occurs.The default settings that are programmed at the factory are listed in Table 4.
Table 4
Crankcase Pressure
Parameter Default Setting
Warning setpoint 2 kPa (.3 psi)
Warning delay 3 seconds
Maximum time of derating 480 seconds
Hysteresis 0.25 kPa (.036 psi)
Security level Required password If the crankcase pressure is above 2 kPa (.3 psi) for three seconds, a warni