SHIELD ASSEM. (L.H.) 5N7983 - Caterpillar

Illustration 1 g01354594
Schematic for the transmission oil temperature sensorThis diagnostic code is associated with the transmission oil temperature sensor. The "FMI 04" means that the Power Train/Chassis Electronic Control Module (ECM) has determined that the voltage of the circuit for sensor is below normal.The transmission oil temperature sensor is a Pulse Width Modulated (PWM) sensor that operates at a frequency of approximately 500 Hz.The possible causes of this diagnostic code are listed below:
A shorted harness.
A failed sensor.
The ECM may have failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of "CID 0177 FMI 04" is active before performing this procedure.Test Step 1. CHECK THE SENSOR
Turn the battery disconnect switch and the key start switch to the ON position.
Ensure that the diagnostic code is active.
Observe the status of the diagnostic code. Then, disconnect the machine harness from the sensor.Expected Result:If the sensor is not the cause of the diagnostic code, the diagnostic code remains active. If the sensor has failed, the diagnostic code is no longer active.Results:
YES - The diagnostic code remains active. The sensor is not faulty. The machine harness or the ECM may be faulty. Proceed to Test Step 2.
NO - The diagnostic code is no longer active.Repair: The machine harness is correct and the ECM is operating properly. The sensor has failed. Replace the sensor.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND
The sensor remains disconnected from the machine harness.
Turn the battery disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness connector J1 and J2 from the ECM.
Measure the resistance from J2-25 (wire 428-YL) to all source of frame ground.Expected Result:The resistance should be greater than 5 ohms.Results:
YES - The resistance is greater than 5 ohms. The ECM may have failed. Proceed to Test Step 3.
NO - The resistance is less than 5 ohms. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors and clean the harness connectors.
Reconnect all the harness connectors.
Turn the battery disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the "CID 0177 FMI 04".Expected Result:The "CID 0177 FMI 04" is active.Results:
YES - The "CID 0177 FMI 04" is active. The diagnostic code has not been corrected. The ECM may have failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Refer to Systems Operation, Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - The "CID 0177 FMI 04" is not active. The diagnostic code does not exist at this time.Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness