John Deere Fault Code

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SPN 1231 FMI 9

Hydraulic Functions Disabled

System

Network

Symptom

Hydraulic Functions Disabled

Diagnosis & fix steps

LOGIC: J1939 Network #2 - Abnormal Update Rate. ACTION: Check the CAN-bus backbone for a loose terminating resistor or a pinched harness.

Red Seal field insights

Specs: Resistance between CAN-H and CAN-L should be 60 Ohms. PRO-TIP: Often found in the "articulation joint" harness.

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