VALVE AS-RELIEF 5I7083 - Caterpillar

TYPE="LEVEL" DEPTH="1" @@@-->Sensors and Electrical Components
Failure of Sensors
A failure of any of the sensors may be caused by one of the following malfunctions.
Sensor output is open.
Sensor output is shorted to "- battery" or "+ battery".
Measured reading of the sensor is out of the specification.Engine Oil Pressure Sensor
Illustration 1 g00290693
Engine Oil Pressure Graph (X) Engine RPM (Y) Engine oil pressure in kPa (1) Sufficient pressure (2) Insufficient pressureLow Oil Pressure
The engine oil pressure sensor detects engine oil pressure for diagnostic purposes. The engine oil pressure sensor sends a signal to the Electronic Control Module (ECM). No resetting procedure is required.Low Oil Pressure Warning
The ECM monitors engine oil pressure (Y) and engine rpm (X) in order to detect an unacceptable low oil pressure condition. If the customer has specified this parameter and if this condition exists, an event is logged and a warning signal is transmitted.Note: Mechanically controlled engines can be equipped with an oil temperature gauge and with an oil pressure gauge.Very Low Oil Pressure Warning
The ECM monitors engine oil pressure (Y) and engine RPM (X) in order to detect a low oil pressure condition that is dangerous. If the customer has specified this parameter and if this condition exists, a fault is logged and a warning signal is transmitted. If the customer has specified the "DERATE" parameter, the ECM will slow the engine to a safe operating range.Failure of the Engine Oil Pressure Sensor
If one of the following conditions exist, a failure of the engine oil pressure sensor may have occurred:
Engine oil pressure sensor output is open.
Engine oil pressure sensor output is shorted to ground.
Engine oil pressure sensor output is shorted to electrical power supply.
Measured reading of the oil pressure is out of the specification.The ECM will detect a failure of the engine oil pressure sensor. The diagnostic lamp warns the operator about the status of the engine oil pressure sensor on the clean side of the filters. The related strategies for oil pressure will be disabled. A failure of the engine oil pressure sensor will not cause a shutdown of the engine.Fuel Pressure Sensor
The fuel pressure sensor monitors the fuel filter outlet pressure. Low fuel pressure or high fuel pressure will not cause a shutdown of the engine or any horsepower change. Fuel pressure that is outside of the normal range will affect the engine performance. If the fuel filter outlet pressure is low, replace the fuel filter.Exhaust Temperature Sensors
The ECM will automatically perform the following functions if a high exhaust temperature occurs:
Warning
DeratingThe default settings that are programmed at the factory are listed in Table 1.
Table 1
Exhaust Temperature    
Parameter     Default Setting    
Warning setpoint     2T specification    
Warning delay     5 seconds    
Derate setpoint     2T specification    
Derate delay     5 seconds    
Delay per step     15 seconds    
Hysteresis     10 °C (18 °F)    
Security level     Required password    
Derating per step     2% per step    If the exhaust temperature is above the setpoint for the derating