John Deere 003516.09: DEF Quality Sensor Has Lost Communication With The Quality DEF Sensor

The system has detected that the DEF Quality Sensor has lost communication with the Quality DEF Sensor. This indicates a failure in the communication link between these components.

1. 1

   The connection between the DEF Quality Sensor and the Quality DEF Sensor

2. 2

   The wiring harness associated with the DEF Quality Sensor

3. 3

   The integrity of the communication circuit between the components

1. 1

   Inspect

   Inspect the connection between the DEF Quality Sensor and the Quality DEF Sensor for looseness, corrosion, or damage.

2. 2

   Test

   Test the wiring harness for continuity and proper insulation using a multimeter.

3. 3

   Verify

   Verify the integrity of the communication circuit between the components using the service manual as a reference.