CARRIER AS 3277126 - Caterpillar

Illustration 1 g00527377
System Schematic For the Engine Coolant Temperature SensorThis diagnostic code is for the temperature sensor (engine coolant).The EMCP II+ monitors engine coolant temperature in order to protect the engine from a problem with the coolant temperature. The coolant temperature sensor is mounted in the water jacket, close to the front of the engine. The exact location of the engine coolant temperature sensor varies depending on the engine model.The sensor is powered by an 8 volt sensor supply from the GSC+. The coolant 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. The voltage is approximately 1.0 DCV.
135°C (275°F) is approximately 93% of the duty cycle.System Response:Note: The GSC+ is usually programmed to treat a problem with the coolant temperature sensor as an alarm fault. P004 = 0 is the factory default. If the GSC+ is programmed to shutdown for a problem with the coolant temperature sensor, then it is not necessary to press the "Alarm Codes" key in order to view the CID 0110 FMI 02. P004 = 1 is a shutdown. The CID 0110 FMI 02 is automatically shown on the upper display.Note: Diagnostic codes are created when the harness connector is disconnected from the GSC+ during the troubleshooting procedures. Clear these created diagnostic codes after the particular problem is corrected. An FMI 02 describes an incorrect signal.The possible causes of a CID 0110 FMI 02 are listed below:
The base frequency of the sensor signal is beyond accepted limits.
The duty cycle of the sensor signal is beyond accepted limits.Begin to perform these procedures only when the CID 0110 FMI 02 is showing and when the "DIAG" indicator is FLASHING on the upper display. The diagnostic code is active when the "DIAG" indicator is FLASHING. The GSC+ treats a CID 0110 FMI 02 as an alarm fault. Active alarm faults are shown on the display when the alarm codes key is pressed and the engine control switch (ECS) is in any position except the OFF/RESET position. For an inactive diagnostic code, the problem may be intermittent. To troubleshoot an inactive diagnostic code, use the preceding system schematic and see Testing And Adjusting, "Electrical Connector - Inspect". Clear the diagnostic code from the fault log after troubleshooting is complete.Note: This procedure can be replaced by troubleshooting the sensor signal with a meter that is capable of measuring frequency and duty cycle. See Testing And Adjusting, "Pulse Width Modulated (PWM) Sensor - Test".Note: If a CID 269 is active, correct the problem prior to proceeding with this procedure.Test Step 1. CHECK THE GSC+ AND THE HARNESS.
Make sure that CID 0110 FMI 02 is showing on the display.
Turn the ECS to the OFF/RESET position.
Disconnect the sensor from the engine harness. The sensor remains fastened to the engine.
Turn the ECS to the STOP position.
Press the "Alarm