HEATER 6V6971 - Caterpillar

Illustration 1 g00583234
(2) Torque converter output speed sensor (For 797 Models)The location for the torque converter output speed sensor is on the input shaft of the transmission.
Illustration 2 g02126637
Schematic Of The Torque Converter Output Speed Sensor (For 797 Models)This diagnostic code is recorded when the transmission ECM receives an incorrect torque converter output signal from the speed sensor. The following conditions must exist in order for the diagnostic code to be active:
The engine speed is greater than 500 rpm.
The oil temperature is greater than 50°C (122°F).
The transmission is in neutral.
There is no speed from torque converter output.When this diagnostic code is active, the ECM is unable to calculate the correct speed ratios. The quality of shifting will be affected.Note: The machine must be moving in order for the ECM to show this failure.
When it is necessary to work under the machine with the body (bed) raised, attach the body (bed) retaining cables to the rear tow points. Install the rear tow point pins through the ends of the retaining cables.Failure to properly secure the body (bed) may result in personal injury or death.
Test Step 1. CHECK THE SENSOR RESISTANCE
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the speed sensor.
At the connector for the speed sensor, measure the resistance between the two contacts of the connector of the speed sensor.Expected Result:The resistance measurement is between 1000 ohms and 1200 ohms. Results:
OK - The resistance measurement is between 1000 ohms and 1200 ohms. The speed sensor is correct. Proceed to Test Step 2.
NOT OK - The resistance measurement is NOT between 1000 ohms and 1200 ohms. The speed sensor has failed.Repair: Replace the sensor. See Testing and Adjusting, "Speed Sensor - Adjust".STOPTest Step 2. CHECK THE RETURN CIRCUIT
The machine harness remains disconnected from the sensor.
The disconnect switch and the key start switch remain in the OFF position.
At the machine harness connector for the sensor, measure the resistance between contact 1 (wire E909-PA19-WH-18) and frame ground. Expected Result:The resistance should measure 5 ohms or less.Results:
OK - The resistance should measure 5 ohms or less. The return circuit is correct. Proceed to Test Step 3.
NOT OK - The resistance that is measured is greater than 5000 ohms. The return circuit (wire E909-PA19-WH-18) in the machine harness has excessive resistance (open).Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS
Place a jumper between the two contacts of the machine harness connector for the speed sensor.
Disconnect connectors J1 and J2 from the machine harness of the ECM .
Measure the resistance from the sensor signal J1-4 wire (E908-CF6-BR-18) to the return contact J1-5 wire (E909-CF7-WH-18) of the machine harness.Expected Result:The resistance that is measured is less than 5 ohms.Results:
OK - The resistance that is measured is less than 5 ohms. The signal circuit in the machine harness is correct. Proceed to Test Step 4.
NOT OK - The resistance that is measured is greater than