SPRING 7W2110 - Caterpillar

Illustration 1 g00529671
System Schematic For Engine Oil Temperature Sensor (EOTS)The EMCP II+ monitors engine oil temperature in order to protect the engine in case of a problem with the oil temperature. The oil temperature sensor is mounted in an oil gallery of the engine. The exact location of the engine oil temperature sensor varies depending on the engine model.The sensor is powered by an 8 volt sensor supply from the GSC+. The oil temperature signal is a pulse width modulated signal. The base frequency of the signal is 455 Hz (370 to 550 Hz). As temperature changes, the duty cycle of the signal varies from 10 to 95 percent.
-40°C (-40°F) is approximately 10% of the duty cycle, which is approximately 1.0 DCV.
135°C (275°F) is approximately 93% of the duty cycle.Note: The GSC+ is usually programmed to treat an oil temperature sensor fault as an alarm fault. The factory default for P004 is 0. The GSC+ may be programmed to shutdown for an oil temperature sensor fault. P004 is 1 for shutdown. The operator is not required to press the "Alarm Codes" key in order to view the CID 175 FMI 3. The CID 175 FMI 3 are automatically shown on the upper display.Note: Faults are created when the harness connector is disconnected from the GSC+ during these troubleshooting procedures. Clear these created faults after the particular fault is corrected and the particular fault is cleared. In a system that is operating properly, the following list of diagnostic fault codes are created when the harness connector is removed from the GSC+.CID 100 FMI 2 - Pressure Sensor (Engine Oil) CID 110 FMI 2 - Temperature Sensor (Engine Coolant)CID 111 FMI 3 - Fluid Level Sensor (Engine Coolant)CID 175 FMI 3 - Temperature Sensor (Engine Oil)CID 190 FMI 3 - Speed Sensor (Engine)CID 336 FMI 2 - Switch (Engine Control)CID 590 FMI 9 - Engine (ECM)The possible causes of a CID 175 FMI 3 fault are listed below.
A short to the battery positive terminal of the sensor signal.
An open circuit of the sensor signal.Begin performing these procedures, only when CID 175 FMI 3 is showing and the "DIAG" indicator is FLASHING on the upper display. The GSC+ treats a CID 175 FMI 3 fault as an alarm fault. Active alarm faults are shown on the display when the "Alarm Codes" key is pressed. The engine control switch (ECS) must be in any position except the OFF/RESET position. For an inactive fault, the problem may be intermittent. To troubleshoot an inactive fault, use the preceding system schematic. See Testing And Adjusting, "Electrical Connector - Inspect". Clear the fault from the fault log after troubleshooting is complete.Note: If a Sensor Supply fault (CID 269) is active, correct the fault prior to proceeding with this procedure.
Check The Supply Circuit.
Turn the ECS to the OFF/RESET position and then turn the ECS to the STOP position.
Disconnect the sensor from the engine harness. The sensor remains fastened to the engine.
At the engine harness side of the sensor