John Deere 1494 – E00: Master Tailings Sensor Failure

The system has detected an unknown failure in the master tailings sensor (also referred to as the Tailings Rethresher Sensor Module). This sensor monitors the flow of material in the combine's tailings elevator. The fault is logged by the Tailings Control Unit (E00) as a Priority 2 or 3 code, meaning it should be checked promptly but may not require immediate machine shutdown.

• S430
• S440
• S540
• S550
• S650
• S660
• S670
• S670H
• S680
• S680H
• S685
• S685H
• S690
• S690H
• S760
• S770
• S780
• S785
• S790
• 9540
• 9560
• 9580
• 9640
• 9660WTS
• 9680WTS
• 9560STS
• 9650STS
• 9660STS
• 9750STS
• 9760STS
• 9570STS
• T550
• T560
• T660
• T670
• W540
• W550
• W650
• W660
• X9 1000
• X9 1100
• CTS Combines (from S/N 070231)

1. 1

   Check the tailings display; if it consistently reads full when not harvesting or empty when harvesting, the sensor lens is likely dirty or coated with material.

2. 2

   Verify that the bar graph on the display zeros out when the header is disengaged.

3. 3

   Ensure seed size settings are configured correctly in the system, as incorrect settings can cause inaccurate tailings volume readings.

4. 4

   Check for related fault code E00 1494 08 (Stuck photo receiver detected in Master Tailings Sensor), which also calls for cleaning the sensor.

1. 1

   Power down the machine

   Turn the key switch to the OFF position and unplug the tailings sensor's electrical connector.

2. 2

   Access and remove the sensor

   Locate the tailings sensors on the tailings elevator. For S660 and S670 models, remove the retaining screw and nut, then carefully remove the sensor for inspection.

3. 3

   Clean and inspect the sensor

   Inspect the sensor lenses and clean them if dirty. If lenses are clean, remove the lens cover to check for dust underneath. Clean thoroughly and reassemble, ensuring the gasket provides a proper seal.

4. 4

   Reinstall the sensor

   Install the sensor back into position. A plastic cover must be installed prior to replacing the sensors on the elevator to prevent malfunction, incorrect readings, or sensor damage.

5. 5

   Test the system

   Reconnect the sensor, turn the machine on, and test the system to see if the fault clears.

6. 6

   Replace the sensor

   If fault code 1494 persists after thorough cleaning, or if related codes like E00 630 11 (EEPROM failure) are present, replace the Master Tailings Sensor.