John Deere 629..............: ECU to Pump Communication Error

The system has detected a communication error between the ECU and the pump. This may prevent proper operation of the pump or lead to system instability.

1. 1

   The connection between the ECU and the pump

2. 2

   The integrity of the wiring harness between the ECU and the pump

3. 3

   The power supply to the ECU and the pump

1. 1

   Inspect the connection between the ECU and the pump

   Check for loose, damaged, or corroded connections.

2. 2

   Test the wiring harness between the ECU and the pump

   Use a multimeter to check for continuity and proper resistance.

3. 3

   Verify the power supply to the ECU and the pump

   Ensure that both components are receiving the correct voltage.