John Deere 000647.05 – ECU: Intercooler Hydraulic Fan Drive Solenoid Low Amps

The Engine Control Unit (ECU) has detected low amperage in the electrical circuit for the intercooler hydraulic fan drive solenoid. This indicates an open circuit, a high-resistance connection, or a faulty solenoid. If left unresolved, this condition can lead to improper functioning of the engine's cooling fan, potentially causing the engine to overheat under load.

• 6110M
• 6120M
• 6130M
• 5085E
• 5090E
• 5090EL
• 5100E
• 6105M
• 6115M
• 6125M
• 6140M
• 6150M
• 6170M

1. 1

   Visually inspect the wiring harness and connectors leading to the intercooler hydraulic fan drive solenoid for frayed wires, loose connections, or corrosion (pay close attention to the wiring leads on the solenoid coil above the fan drive piston housing)

2. 2

   Check the hydraulic oil reservoir for low fluid levels, which can affect hydraulic fan drive operation

3. 3

   Perform basic electrical checks using a multimeter to verify continuity in the wiring to the solenoid

4. 4

   Test the solenoid's resistance to ensure it is within manufacturer specifications

1. 1

   Prepare machine for service

   Ensure the tractor is on level ground with the parking brake engaged. Disconnect the battery to prevent accidental starting and electrical shorts.

2. 2

   Locate and clean solenoid connections

   Locate the intercooler hydraulic fan drive solenoid on the fan drive assembly. Disconnect the electrical connector and clean both the connector and the solenoid terminals with a suitable electrical contact cleaner.

3. 3

   Test solenoid actuation

   Apply a 12V source directly to the solenoid's terminals and listen for a 'click' to indicate it is actuating properly.

4. 4

   Inspect and repair wiring

   If the solenoid functions correctly, the issue is likely in the wiring. Carefully inspect the entire length of the wiring harness for damage. Repair any broken or frayed wires and ensure all connections are secure.

5. 5

   Replace the solenoid

   If the solenoid fails the actuation test or resistance checks, replace it with a new unit.

6. 6

   Reassemble and test

   Reconnect the electrical connector and the battery. Start the tractor and verify if the fault code has cleared and the fan is operating correctly.