John Deere 3512.04 – XSC or ECU: Sensor Supply 4 Circuit Fault / 5-Volt Supply Voltage 2 Too Low

The voltage supply to the 5-volt sensor components on this specific circuit has dropped below the minimum threshold (typically below 4.75 volts). This condition usually suggests a short circuit to ground in the sensor wiring, a failed sensor pulling the voltage down, or an internal hardware fault within the control unit's voltage regulator.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8235R
• 8260R
• 8285R
• 8310R
• 8335R
• 8360R
• 7R Series
• 6M Series
• 6R Series
• 316GR
• 318G
• 331G
• 333G
• E240LC
• 350G
• 330LC-8B
• 540G-III
• 548G-III
• 540H
• 548H
• 750J-II

1. 1

   Visually inspect the wiring harnesses and connectors associated with the 5-volt supply (Sensor Supply 4) for signs of chafing, melting, corrosion, or loose pins

2. 2

   Unplug the sensors on the #4 supply circuit one at a time while monitoring the voltage with a multimeter or John Deere Service ADVISOR to isolate an internally shorted sensor

3. 3

   With the battery disconnected, use a multimeter to check for continuity between the 5V supply wire and the chassis ground to test for a short to ground

4. 4

   Disconnect the harness from the module (XSC or ECU) and test the 5V output pin directly at the module to verify if the internal voltage regulator has failed

1. 1

   Disconnect Power

   Turn off the machine and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Repair Wiring

   If a short to ground was found in the harness during diagnostics, splice in a new section of wire using weather-sealed heat-shrink connectors, or replace the damaged harness section.

3. 3

   Replace Faulty Sensor

   If unplugging a specific sensor restored the 5V circuit, replace that sensor. Ensure the connector is clean and apply dielectric grease before seating the new sensor.

4. 4

   Replace the Control Module

   If the XSC or ECU is failing to output 5 volts internally, the module must be replaced. Unbolt the module, swap the harnesses to the new unit, and securely mount it.

5. 5

   Calibrate and Clear Codes

   Reconnect the battery. If the XSC module was replaced, the AutoTrac steering wheel module and wheel angle sensors will require re-calibration via the John Deere Service ADVISOR tool. Clear the inactive 003512.04 code and test the machine's operation.