John Deere 524254.31 – ACU or UIC: Transmission Enable Relay Circuit Fault

The control unit detects an incorrect voltage (either too high or too low) or a general problem with the circuit of the transmission enable relay, which may prevent the transmission from engaging to avoid potential malfunctions.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430
• 7210J
• 7630
• 7730
• 7830
• 7930
• 8130
• 8230
• 8330
• 8430
• 8530
• 8310RT
• 8335RT
• 8360RT
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Perform a system reset: Ensure the PTO switch is OFF, cycle it OFF then ON, and restart the engine to reset communication messages

2. 2

   Locate the transmission enable relay (K06/03 or K02/03) in the fuse/relay load center

3. 3

   Measure voltage levels within the relay circuit using a multimeter to determine if they are within the specified range

4. 4

   Inspect the ground circuit (lead 6003) to verify it is properly connected, free of corrosion, and undamaged

5. 5

   Inspect the control lead circuit (lead 6064) for damage or corrosion

6. 6

   Check all wiring and connectors related to the transmission enable relay for signs of damage, wear, or loose connections

1. 1

   Turn off the tractor, remove the key, and ensure the PTO switch is in the OFF position.

2. 2

   Remove the cover to access the main fuse and relay load center.

3. 3

   Locate the Transmission Enable Relay (K06/03 or K02/03).

4. 4

   Remove the relay and test it for proper operation using a multimeter or relay tester. If the relay is found to be defective or degraded, replace it with a new one.

5. 5

   If the relay tests good, trace the ground circuit (lead 6003) and control lead circuit (lead 6064). Repair any chafed wires, broken connections, or degraded electrical components.

6. 6

   Clean any corrosion from the relay socket and harness connectors to ensure the power supply and grounding connections are secure.

7. 7

   Reinstall the relay (or install the replacement), replace the load center cover, and restart the tractor.

8. 8

   Retest the circuit to ensure that the voltage levels are now correct and stable, and verify that the fault code has cleared.