John Deere 004334.18: DEF System Pressure Sensor Voltage Low (ECU)

The fault code indicates that the voltage from the DEF System Pressure Sensor is low, as detected by the ECU. This may affect the proper operation of the DEF system.

1. 1

   The wiring and connections to the DEF System Pressure Sensor

2. 2

   The voltage output of the DEF System Pressure Sensor

3. 3

   The ECU for proper functionality

1. 1

   Inspect

   Inspect the wiring and connections to the DEF System Pressure Sensor for damage, corrosion, or loose connections.

2. 2

   Test

   Test the voltage output of the DEF System Pressure Sensor using a multimeter or diagnostic tool.

3. 3

   Verify

   Verify the functionality of the ECU by checking for any additional fault codes or performing a system diagnostic.