3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B and 3516C Engines Caterpillar Monitoring System Caterpillar

Normal Mode or Mode 0 is used during normal engine operation. The Quad Gauge Electronic Module shows the conditions that are listed below to the operator when the Main Display Module is in Normal Mode.

• Proper operation of the monitoring system is shown. A Self-Test is performed. The Self-Test causes all of the display elements and gauges to operate briefly. For more information on this subject, see Systems Operation, "System Self Test".

• A value for the system condition is shown. The Main Display Module continuously monitors engine systems. The needles in the Quad Gauge Electronic Modules indicate a normal operating condition when the needles are pointing straight up. Also, a normal operating condition may be represented when the needle is not pointing straight up.

• The system shows if an engine problem exists. When an abnormal condition (problem) exists, the corresponding Indicator Lamp flashes and the Alarm sounds. For more information on this subject, see Systems Operation, "Warning Operation".

• The system shows if a diagnostic code exists. The Main Display Module continuously checks for diagnostic codes in the Caterpillar Electronic Control Module (ECM). When a diagnostic code is detected, the display area shows "SERV CODE" and the "Shutdown/Diagnostic" Alert Indicator lights.

• The Tachometer Parameter is shown in Illustration 1. Engine speed is displayed on the six digit display area, when the units indicator shows "RPM". The Main Display Module receives engine speed information from the engine ECM through the CAT Data Link. Use the "SCROLL" switch in order to toggle between the Tachometer Parameter and the Service Meter Parameter.

Illustration 1	g00532879

• The Service Meter Parameter is shown in Illustration 2. The engine ECM records the total number of hours of operation for the engine. This information is sent to the Main Display Module through the CAT Data Link. The total engine operating hours are shown on the six digit display area. The service meter symbol is ON in order to indicate that the display is functioning as a Service Meter. While the engine is operating, the value is continuously updated. Use the "SCROLL" switch in order to toggle between the Tachometer Parameter and Service Meter Parameter.

Illustration 2	g00532883