SEAL 5P4591 - Caterpillar

An event code alerts the operator to an abnormal engine operating condition such as low oil pressure or high coolant temperature. As this engine normally reports faults as J1939 codes, event codes are only identifiable by the Failure Mode Identifier (FMI). The FMI is the second element of the fault code. All events are identified by the following FMIs:
Table 1
FMI Description
15 Parameter High - Least Severe (1)
16 Parameter High - Moderate Severity (2)
0 Parameter High - Most Severe (3)
17 Parameter Low - Least Severe (1)
18 Parameter Low - Moderate Severity (2)
1 Parameter Low - Most Severe (3) The Electronic Control Module (ECM) can log events. Logged events usually indicate a mechanical fault instead of an electronic system fault or the engine is operating outside the design specification.Note: If a diagnostic code has already been logged, any associated event code to that fault will not be logged.Note: If an event code is already active, a diagnostic code that is associated with the same sensor will not be active.Active Event Codes
An active event code represents a fault with engine operation. Correct the fault as soon as possible.Active event codes are listed in ascending numerical order. The code with the lowest number is listed first.Event codes will cause the warning lamp to illuminate and the event will be logged.Illustration 1 is an example of the operating range of an oil temperature sensor. Do not use the Illustration to troubleshoot the oil temperature sensor.
Illustration 1 g01365757
Example of the typical operating range of a sensor
(1) This area represents the normal operating range of the engine parameter.
(2) In these areas, the engine is operating in an unsafe operating range of the monitored parameter. An event code will be generated for the monitored parameter. The sensor circuit does not have an electronic fault.
(3) In these areas, the signal from the sensor is outside of the operating range of the sensor. The sensor circuit has an electronic fault. A diagnostic code will be generated for the sensor circuit. Refer to Troubleshooting, "Self Diagnostics" for additional information on diagnostic codes. The following format is used for event codes:"XXXX-YY Description of the event"The "XXXX" represents a System Parameter Number for the event code. The "-YY" represents FMI for the severity of the event. The FMI is followed by a description of the event. Refer to the following example:"100-17 Engine Oil Pressure : Low - Least Severe (1)"In this example, the number "-17" indicates the severity of the event. The ECM has three levels of response to events:Level (1) - This level can be referred to as the "Warning Level". This condition represents a serious problem with engine operation. However, this condition does not require the engine to derate or shut down. The warning lamp will come on.Level (2) - This level can be referred to as the "Derate Level". For this condition, the ECM will derate the engine in order to help prevent possible engine damage. The warning lamp will flash.Level (3) - This level can be referred to