3126B Marine Engines Caterpillar

The Electronic Control Module (ECM) can log events. Events refer to engine operating conditions such as low oil pressure or high coolant temperature. Logged events usually indicate a mechanical problem instead of an electronic system problem. Illustration 1 demonstrates the difference in output voltage for an event code and for a diagnostic code that is caused by a typical analog sensor.

Events can be in the form of a warning, a derate, or a shutdown. The events that are available for this application can be found in this section of the document.

Illustration 1	g00784650
Output voltage from a typical temperature sensor

Monitoring System

The electronic service tool can be used to program certain monitoring system parameters. Certain features can be enabled or disabled and some of the trip points can be set. When an event is active, the ECM will generate an event code.

Refer to the table for monitoring system parameters in Troubleshooting, "System Configuration Parameters" for the various features that can be programmed.

The following actions will be taken when an event is occurring:

"Warning" - The warning lamp will come on continuously while the event is occurring.

"Derate" - The warning lamp will flash while the event is occurring and engine power will be derated.

If multiple derates are active, the derate that limits the most power will be the derate that is shown.

When a selected monitoring system parameter is programmed to "Off", the ECM will not take any action on the event. For example, the warning lamp will not come on.