John Deere 005435.09: DEF Unit Pump No Communication (ECU)

The system has detected a lack of communication between the DEF Unit Pump and the ECU. This indicates a potential issue with the connection or functionality of the component identified by this code.

1. 1

   The connection between the DEF Unit Pump and the ECU

2. 2

   The wiring harness associated with the DEF Unit Pump

3. 3

   The power supply to the DEF Unit Pump

1. 1

   Inspect

   Inspect the connection between the DEF Unit Pump and the ECU for any signs of damage, corrosion, or looseness.

2. 2

   Test

   Test the wiring harness associated with the DEF Unit Pump for continuity and proper insulation.

3. 3

   Verify

   Verify the power supply to the DEF Unit Pump is functioning as expected.