JCB P0651: ECU Internal 5V Supply 2 Fault

The system has detected a fault in the internal 5V power supply for the ECU. This may affect the proper operation of the ECU and related systems.

1. 1

   Power supply connections to the ECU

2. 2

   ECU wiring harness

3. 3

   ECU itself

1. 1

   Inspect

   Check the power supply connections to the ECU for looseness, corrosion, or damage.

2. 2

   Test

   Use a multimeter to verify the 5V supply to the ECU, following the service manual procedures.

3. 3

   Replace

   If the 5V supply is not stable or absent, replace the ECU or repair the affected circuit as needed.