John Deere 971..............: External Fuel Derate Switch Active

The system has detected that the external fuel derate switch is active, which may limit engine performance. This condition is triggered by the switch being engaged or activated.

1. 1

   The status of the external fuel derate switch

2. 2

   The wiring or connection to the external fuel derate switch

1. 1

   Inspect

   Check the physical condition and position of the external fuel derate switch.

2. 2

   Test

   Verify the operation of the external fuel derate switch and its connection to the system.