John Deere 000925.03 – SCU/SCC: High Voltage On Rear SCV Valve 12

A high voltage condition has been detected on the Rear Selective Control Valve (SCV) number 12. The .03 suffix signifies that the voltage in this specific circuit is above the normal operating range or is shorted to a high voltage source, indicating an electrical fault within the circuit associated with this component.

• 7R
• 8R
• 9R

1. 1

   Restart the machine to see if it clears intermittent communication faults

2. 2

   Visually inspect the wiring harness and connectors associated with the rear SCVs for pinched or frayed wires, corrosion on connector pins, or loose connections

3. 3

   Inspect fuses related to the SCU/SCC and hydraulic systems (specifically check fuse F30)

4. 4

   Check the area around the batteries and alternator for any accumulated debris that could cause electrical issues

5. 5

   If an implement is connected, check its wiring harness and connectors for faults, as implement electrical issues can trigger tractor control unit codes

1. 1

   Isolate the fault

   Disconnect the electrical connector for SCV 12 to see if the fault code changes or disappears. This helps determine if the fault is in the valve's solenoid or in the wiring harness.

2. 2

   Test circuit voltage

   Using a multimeter, check the voltage at the connector for SCV 12 and compare it to manufacturer specifications. A reading significantly higher than normal confirms the high voltage condition.

3. 3

   Check for shorts

   Test for a short circuit between the signal wire and the power wire in the harness, which is a common cause of high voltage faults.

4. 4

   Inspect the control unit

   If the wiring and valve solenoid appear to be in good condition, inspect the SCU/SCC control unit's connectors for any damage or corrosion.

5. 5

   Seek professional assistance

   Due to the complexity of modern tractor electronics, if the preliminary checks do not resolve the issue, it is highly recommended to have the machine serviced by a certified John Deere technician who has access to detailed service manuals and diagnostic tools.