C6.6 Generator Set Caterpillar

Indicator Lamps

Usage:

Indicator Lamps

The functions of the indicator lamps are designed to display the maximum amount of information on the minimum number of lamps.

Eight lamps are available as options. The "Shutdown" lamp and the "Warning" lamp will normally be installed in the application. Dedicated optional lamps for other items may also be installed. The remaining optional lamps are "Low oil pressure", "Overspeed", "High Coolant Temperature", "Diagnostic", "Derate" and "Maintenance".

The "Shutdown" lamp and the "Warning" lamp can also be used to indicate a diagnostic code by use of the "Flash Code" feature. The "Flash Code" feature can be used to indicate all active diagnostic codes and logged diagnostic codes.

Functions of the Lamps

Shutdown Lamp

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds. The lamp will then go off unless there is an active warning.

On - The lamp will be on when the shutdown level in the engine protection strategy has been reached.

Warning Lamp

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds. The lamp will then go off unless there is an active warning.

On - The lamp will be on when the warning level has been reached.

Low Oil Pressure

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds.

On - The lamp will come on when a low oil pressure event is detected. The "Warning" lamp and the "Shutdown" lamp may also come on.

High Coolant Temperature Lamp

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds.

On - The lamp will come on when a "high coolant temperature" event is detected. The "Warning" lamp and the "Shutdown" lamp may also come on.

Overspeed Lamp

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds. The lamp will then go off unless the engine overspeeds.

On - The lamp will come on when an "engine overspeed" event is detected. The "Warning" lamp and the "Shutdown" lamp may also come on.

Derate Lamp

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds.

On - The lamp will come on when the engine is derated.

Diagnostic Lamp

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds.

Flashing - The lamp will flash when a diagnostic code or an event code is active. Refer to "Flash Codes".

Maintenance Lamp

Lamp check - When the keyswitch is turned to the ON position, the lamp will come on for two seconds. The lamp will then go off unless maintenance is due.

On - The lamp will come on when maintenance is due.

Color of Lamps

Typically, the "Shutdown" lamp is colored red and the "Warning" lamp is colored amber. The other lamps are optional.

Operation of the Indicator Lamps

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Table 1
Warning Lamp (Alert Lamp)	Shutdown Lamp (Action Lamp)	Diagnostic Lamp	Derate Lamp	Lamp State	Description of the Indication	Engine State
On	On	On	On	Lamp Check	When the keyswitch is switched on, the lamps come on for a period of 2 seconds and the lamps will then go off.	The keyswitch is on but the engine has not yet been cranked.
Off	Off	Off	Off	No Faults	With the engine in operation, there are no active warnings, diagnostic codes or event codes.	The engine is operating with no detected faults.
On	Off	Flashing	Off	Warning (Warning only)	If the warning lamp comes on during engine operation, and the diagnostic lamp is flashing, the lamps indicate that one or more of the warning values for the engine protection strategy have been exceeded and that there is an active event code. However, the value has not been exceeded to a level that will cause a derate or a shutdown.	The engine is operating normally. However, there is one or more of the monitored engine parameters that are outside of the range that is acceptable.
On	Off	Flashing	On	Derate (Warning and Derate)	If both the warning lamp and the derate lamp come on during engine operation, and the diagnostic lamp is flashing, the lamps indicate that one or more of the values for the engine protection strategy have been exceeded beyond the level that will cause an engine derate.	The engine is operating. However, one or more of the monitored engine parameters is outside of the acceptable range. The acceptable range has been exceeded to a level which requires a warning and an engine derate.
On	On	Flashing	Off	Engine shutdown (Warning and shutdown)	If both the warning lamp and the shutdown lamp come on during engine operation, and the diagnostic lamp is flashing, the lamps indicate that one or more of the shutdown values for the engine protection strategy has been exceeded and there is an active event code.	The engine is either shutdown or an engine shutdown is imminent. One or more monitored engine parameters have exceeded the limit for an engine shutdown.
Off	Off	Flashing	Off	Diagnostic (Diagnostic only)	When the diagnostic lamp flashes during operation of the engine, the lamp indicates that an active diagnostic code (an electrical fault) is present. However, the diagnostic code is not serious enough to cause a derate or a shutdown.	The engine is operating but there is one or more faults with the electronic system for the engine.
Off	Off	Flashing	On	Derate (Diagnostic and Derate)	If the derate lamp comes on during engine operation, and the diagnostic lamp is flashing, the lamps indicate that an active diagnostic code (an electrical fault) is present. The diagnostic code is serious enough to cause an engine derate.	The engine is operating. However, an active diagnostic code is causing an engine derate.
Off	On	Flashing	Off	Engine Shutdown	If the shutdown lamp comes on during engine operation, and the diagnostic lamp is flashing, this indicates that an active diagnostic code (an electrical fault) is present. The diagnostic code is serious enough to cause the engine to shutdown.	The engine is either shutdown or an engine shutdown is imminent. A serious diagnostic code is active.

Flash Codes

The "Flash Code" feature is used to flash the two digit code of all active diagnostic and event codes. Refer to the Troubleshooting Guide, "Diagnostic Codes" for the flash code that is related to the diagnostic code or an event.

When a diagnostic code or an event code is active or logged, the diagnostic lamp will flash repeatedly in order to indicate the codes.

Each flash will be on for half a second and off for 300 milliseconds. The "Diagnostic" lamp will remain off for two seconds between each digit of a code. If there is more than one diagnostic code, the "Diagnostic" lamp will go off for five seconds. The lamp will then flash in order to indicate the next code.

As an example, an active diagnostic code of "21" is indicated by the "Diagnostic" lamp coming on for 500 ms, then off for 300 ms, then on for 500 ms, then off for 2000 ms, then on for 500 ms and then off.

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