BOLT 8F8544 - Caterpillar

Engine Events
Engine events are abnormal engine operating conditions such as low oil pressure or high coolant temperature. If an engine event is detected by the engine's Electronic Control Module (ECM), the ECM will generate a code. The code can be an event code if the technician is monitoring the code over the Cat Data Link or a Suspect Parameter Number (SPN) - Failure Mode Identifier (FMI) code if the technician is monitoring the code over the CAN data link. The codes aid the service technician in identifying the nature of the problem. The technician must have access to a diagnostic tool to read information about the code. There are two types of data links that are used for communication with the engine ECM. Each data link displays the code in a different way. The data links are described below.Cat Data Link
The Cat Data Link is used by the engine's ECM to communicate with Caterpillar controllers or display modules. Caterpillar Electronic Technician (ET) is a software program that is designed to run on a personal computer. Cat ET can be used by the service technician to view information about an event code that is generated by the engine's ECM. The following term describes the elements of the event code:Event Code - The "E" identifies the code as an event code. The "XXX(X)" represents a numeric identifier for the event code. The fourth "(X)" assigns one of three levels to the active event code according to the severity of the abnormal system condition. This is followed by a description of the code. Refer to the following example:
E360(1) Low Engine Oil Pressure
E360(2) Low Engine Oil Pressure
E360(3) Low Engine Oil PressureThree possible responses may be available for each parameter. Some of the responses are not available for some of the parameters. Refer to Table 1.
Table 1
Indicators (1), (2), and (3)
Warning Category Indicator Severity
(1) Least Severe
(2) Moderate Severity
(3) Most Severe The definition for the levels of severity for an event are defined below:Level (1) - Level (1) requires no immediate action. The system may need attention soon. The operator should check the involved system condition or the operator should perform maintenance on the involved system at the earliest possible time.Level (2) - Level (2) requires a change in the operation of the engine or the performance of a maintenance procedure. Failure to correct the problem that causedthis warning may result in damage to the engine components.Level (3) - Level (3) requires an immediate safe shutdown of the engine to avoid damage to the engine or injury to personnel around the engine. The problem that caused the event must be corrected before engine operation can resume.CAN Data Link
The CAN data link is used by the engine's ECM to communicate with aftermarket controllers or display modules. The CAN data link is referred to as the J1939 data link. When a diagnostic code is activated, the ECM can transmit information about the code over the J1939 data link to aftermarket controllers. The code will be displayed