John Deere 3511.04 – Engine Control Unit (ECU): Sensor Supply #3 Voltage Out of Range Low

The Engine Control Unit (ECU) detects that the voltage on the 5-volt sensor supply circuit #3 has dropped below the acceptable specification (typically below 4.75 volts), indicating a short to ground in the wiring harness, a shorted sensor, or an internal ECU fault.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 7630
• 7730
• 7830
• 7930
• 6M-1654
• 6M-1854
• 6M-2104
• 9470RT
• 9520RT
• 9570RT
• 7R Series
• 8R Series
• 310G
• 310J
• 310SG
• 410G
• 710G
• 444K
• 524K
• 544K
• 624K
• 644K
• 724K
• 744K
• 824K
• 844K
• 3520 Sugar Cane Harvester
• 210LJ Landscape Loader
• 4930 Sprayer
• 4940 Sprayer

1. 1

   Inspect the wiring harness, connectors, and pins associated with the 5-volt supply #3 circuit for signs of physical damage, rubbing, corrosion, or loose connections.

2. 2

   Use a multimeter to test the 5V supply wire for continuity to ground to check for shorts.

3. 3

   Perform a sensor isolation test (drop-out test) by disconnecting sensors on this circuit one at a time (starting with the Foot Throttle Position Sensor). If the 5V reference voltage returns to normal at the ECU pin after unplugging a specific sensor, that sensor is internally shorted.

4. 4

   Test ECU output: If all sensors are unplugged and the wiring harness is verified to have no shorts to ground, but the ECU is still outputting less than 4.75 volts on that pin, the ECU's internal voltage regulator has failed.

1. 1

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

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

2. 2

   Locate the Foot Throttle Position Sensor (or the specific sensor identified during the isolation test).

   Locate the Foot Throttle Position Sensor (or the specific sensor identified during the isolation test).

3. 3

   Inspect the pigtail wiring leading to the sensor. If the wiring is chafed and touching the chassis, repair the wire using OEM-approved splicing methods and heat shrink.

   Inspect the pigtail wiring leading to the sensor. If the wiring is chafed and touching the chassis, repair the wire using OEM-approved splicing methods and heat shrink.

4. 4

   If the wiring is intact but the sensor failed the isolation test, remove the mounting hardware securing the sensor to the pedal assembly or linkage.

   If the wiring is intact but the sensor failed the isolation test, remove the mounting hardware securing the sensor to the pedal assembly or linkage.

5. 5

   Install the new potentiometer/position sensor and secure the mounting hardware.

   Install the new potentiometer/position sensor and secure the mounting hardware.

6. 6

   Reconnect the sensor harness.

   Reconnect the sensor harness.

7. 7

   Reconnect the battery, turn the key to the ON position, and use a diagnostic tool (like John Deere Service ADVISOR) to clear the inactive 003511.04 code.

   Reconnect the battery, turn the key to the ON position, and use a diagnostic tool (like John Deere Service ADVISOR) to clear the inactive 003511.04 code.

8. 8

   Verify operation by monitoring the 5V supply voltage and the throttle position percentage in the diagnostic software while sweeping the pedal.

   Verify operation by monitoring the 5V supply voltage and the throttle position percentage in the diagnostic software while sweeping the pedal.