FAN-ALTERNATOR 1006531 - Caterpillar

Cat Monitoring System
The engine is equipped with a programmable Cat monitoring system. The electronic control module (ECM) monitors the operating parameters of the engine. The ECM can initiate responses if a specific engine parameter exceeds an acceptable range. Three possible responses may be available for each parameter: "", "DERATE" and "SHUTDOWN". Some of the responses are not available for some of the parameters. An Electronic Technician (ET) service tool is used to perform the following activities:
Select the available responses.
Program the level for monitoring.
Program delay times for each response.The default settings for the parameters are programmed at the factory. To accommodate unique applications and sites, the parameters may be reprogrammed with an ET service tool.The screens of the ET service tool provide guidance for the programming. The following options can be programmed "ON" or "OFF": , "", "DERATE" and "SHUTDOWN".The screens of the ET service tool also provide guidance for changing setpoints. For information on programming the Cat monitoring system, use the appropriate ET service tool and see the Service Manual, "Troubleshooting" module.The Cat monitoring system is enabled after the engine is started. When the engine rpm exceeds 50 rpm below low idle, the ECM begins checking parameters. The ECM monitors the parameters in order to determine if the parameters exceed the setpoints.If the monitoring system initiates a warning, a deration, or a shutdown, the event is logged into the ECM. The event is logged even if the parameter is programmed "OFF". If a setpoint for a parameter is exceeded, the event will be logged.Any failure of a sensor will result in disabling the corresponding portion of the monitoring system. The failure of a sensor will cause an "ACTIVE" diagnostic code for the sensor.The derating is cumulative. For example, a derating of 5 percent followed by a derating of 2 percent results in a total derating of 7 percent. If the conditions that cause the derating are not corrected, the derating will continue.Default Settings for the Cat Monitoring System
The monitoring system determines the level of action that is taken by the ECM in response to a condition that can damage the engine. When any of these conditions occur, the appropriate event code will be generated.Table 1 contains the parameters that are monitored and the appropriate event code(s) that can be generated for that parameter. Table 1 also contains the minimum and maximum ranges for the parameter and the default trip points for each parameter. The actual settings for each parameter can be viewed with Cat Electronic Technician (ET). The trip points for some of the parameters may be adjustable with Cat ET.
Table 1
Monitoring System Parameters    
Parameter    Action    Delay Time in Seconds    Trip Point    Default State    
Min Max Default    Min    Max    Default    
E021(2) High Exhaust Temperature Derate