CONE-ROLLER BEARING 1B3980 - Caterpillar

MID 027 CID 0177 FMI 03Conditions Which Generate This Code:
Illustration 1 g01309283
Connections of the transmission oil temperature sensor
This diagnostic code is associated with the transmission oil temperature sensor. This diagnostic code is recorded when the ECM reads the signal from the transmission oil temperature sensor as being shorted to the +battery. The sensor produces a PWM signal.Possible causes of the diagnostic code is listed:
The supply circuit to the sensor is open.
The return circuit is open.
The signal circuit is shorted to the +battery.
The signal circuit is open or the sensor is disconnected.
The sensor has failed.
The ECM has failed. This is unlikely.Note: Ensure that CID 0177 FMI 03 is active. This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. When the procedure is completed, clear the created diagnostic codes.Test Step 1. CHECK THE VOLTAGE AT THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Disconnect the sensor from the machine harness.
At the machine harness connector for the sensor, measure the voltage between contact A (wire R800-OR(Orange)) and contact B (wire R998-BR(Brown)). Expected Result:The voltage should measure approximately 8 DCV.Results:
OK - The voltage is approximately 8 DCV. Proceed to test step 4.
NOT OK - The voltage is not approximately 8 DCV. Repair: There is a problem with the machine harness or the ECM has failed. It is unlikely that the ECM has failed.Proceed to test step 2.Test Step 2. CHECK FOR AN OPEN IN THE SUPPLY CIRCUIT.
The key start switch and the disconnect switch remain in the ON position.
The sensor remains disconnected from the machine harness.
At the machine harness connector for the sensor, measure the voltage from contact A (wire R800-OR(Orange)) to ground. Expected Result:The voltage should measure approximately 8 DCV.Results:
OK - The voltage measurement is approximately 8 DCV. Proceed to test step 3.
NOT OK - The voltage does not measure approximately 8 DCV.Repair: The supply circuit is not correct. Repair the circuit or replace the circuit.STOPTest Step 3. CHECK FOR AN OPEN IN THE RETURN CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
The sensor remains disconnected from the machine harness.
Disconnect the machine harness connector J1 from the ECM.
At the machine harness connector for the sensor, install a jumper wire from contact B (wire R998-BR(Brown)) to ground.
At the machine harness connector for the ECM, measure the resistance from contact J1-45 (wire R998-BR(Brown)) to ground. Expected Result:The resistance measurement should measure less than 5000 ohms.Results:
OK - The resistance measurement is less than 5000 ohms. The harness is correct.Repair: Check the circuit again. If the Caterpillar Electronic Technician (Cat ET) is available, use the Cat ET service tool in order to perform a “Wiggle Test” on the machine wiring harness. The “Wiggle Test” can detect shorts and opens in the machine wiring harness that are momentary or intermittent.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. See Testing