PULLEY AS 6N7690 - Caterpillar

A fault is any condition that does not conform to the GSC operating rules. A fault is an abnormal condition. An active fault is a fault that is occurring now. An inactive fault is a fault that previously occurred. Some examples of a fault are listed below.
Coolant temperature is 123°C (254°F). This is a high water temperature fault.
Engine speed is 4500 rpm. This is a fault for the engine overspeed.
There is a broken wire in the engine harness. This is a diagnostic code.
There is a failed oil pressure sensor. This is a diagnostic code. There is a level of severity that is attached to every fault. This level also describes the GSC response to the fault. Faults are either a noncritical alarm fault or a critical shutdown fault. An alarm fault provides an early warning of a possible future shutdown fault to the operator. During an alarm fault, the GSC will automatically activate the alarm mode. The fault alarm indicator FLASHES. See Systems Operation, "Alarm Mode" for more information. A shutdown fault tells the GSC to shutdown the engine. This shutdown prevents damage to the generator set. For a shutdown fault, the GSC automatically activates shutdown mode. Shutdown mode shuts down the engine. The corresponding shutdown indicator flashes automatically. See Systems Operation, "Shutdown Mode" for more information. Most faults have a code. There are three types of fault codes. The type of fault code is derived from the related GSC input. The three types of fault codes are listed below.
AL Fault Codes are shown as "AL1" through "AL4" on the upper display. AL fault codes include specific fault conditions such as an alarm for the low engine oil pressure.
SP fault codes are shown as "SP1" through "SP3" on the upper display.
Diagnostic Codes are numeric values that are identified by the illumination of "CID" and "FMI" on the upper display. Note: There are no fault codes for the shutdown faults that correspond to the dedicated shutdown indicators. Each of these shutdown faults are identified to the operator by the nomenclature that is nearest to the dedicated shutdown indicator. An example would be low oil pressure shutdown.