Massey Ferguson 001639.19 – DCC2: Engine Cooling Vistronic Fan Fault

The Datatronic Control Console (DCC2) is receiving invalid or implausible data from the Vistronic fan speed sensor (SPN 1639, FMI 19). This communication failure prevents the controller from accurately monitoring the fan's rotational speed, which can result in improper engine cooling due to a malfunction in the fan system. The root cause may be a faulty speed sensor, damaged wiring, or a mechanically failed viscous fan clutch.

• 6400 Series
• 6460
• 6465
• 6470
• 6480
• 6485
• 6490
• 6495
• 6497
• 6499
• 7400 Series

1. 1

   With the engine off, manually rotate the fan. It should turn smoothly with some resistance. If it feels rough, does not turn, or has excessive play, the fan clutch may be mechanically failed.

2. 2

   Inspect the viscous fan clutch for any signs of silicone fluid leakage on the front face or hub.

3. 3

   Inspect the fan blades for any damage, as an imbalanced fan can damage the clutch.

4. 4

   Inspect the wiring harness and connectors between the Vistronic fan clutch and the DCC2 controller for any signs of damage, corrosion, chafing, or loose connections. Pay close attention to the connector at the fan clutch itself.

5. 5

   Test the fan clutch solenoid: Disconnect the fan clutch connector. Apply 12V DC across the solenoid power and ground wires (typically red and blue). The current draw should be between 1.0 and 2.0 Amps.

6. 6

   Test the fan speed sensor: With the key on but the engine off, connect a multimeter to the fan speed sensor signal and ground wires. Manually rotating the fan should generate a voltage signal.

7. 7

   Perform a continuity test on the wiring for the fan speed sensor and solenoid back to the controller to rule out any breaks in the wires.

1. 1

   Component Replacement

   Depending on the diagnosis, either the fan speed sensor or the entire viscous fan clutch assembly will need to be replaced. In many cases, the speed sensor is integrated into the fan clutch, necessitating the replacement of the entire unit.

2. 2

   Removal of the Old Component

   Disconnect the negative battery terminal. Remove the fan shroud and any other obstructing components to gain access to the fan clutch. Release the serpentine belt tension and remove the belt from the fan pulley. Disconnect the electrical connector from the fan clutch. Remove the bolts securing the fan blades to the clutch, and then remove the fan blades. Unbolt the fan clutch assembly from its mounting bracket and remove it from the engine.

3. 3

   Installation of the New Component

   Important: When handling a new viscous fan clutch, do not store it lying flat or upside down, as this can cause the internal silicone fluid to migrate and affect its operation. Mount the new fan clutch assembly onto the engine, ensuring it is correctly aligned. Re-install the fan blades onto the new clutch, tightening the bolts to the manufacturer's specified torque. Reconnect the electrical connector. Re-install the serpentine belt and fan shroud. Reconnect the battery.

4. 4

   Post-Repair Checks

   Start the engine and check for any unusual noises or vibrations. Allow the engine to reach operating temperature and verify that the fan engages and disengages correctly. The fan should be relatively quiet when the engine is cold and become noticeably louder as it engages when the engine warms up. Clear the fault codes using a diagnostic tool and check if the 001639.19 code reappears.