Massey Ferguson 10.02.24 – AC Module (AIRCON): No Engine Speed Information Received On The CAN BUS To AC Module (AIRCON)

This indicates a communication failure on the tractor's Controller Area Network (CAN) bus. Specifically, the Air Conditioning (AC) Control Module is failing to receive the engine RPM data broadcasted by the Engine Control Unit (ECU).

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Check for accompanying codes: Verify if the Engine ECU is logging its own engine speed sensor faults, which would prevent it from broadcasting speed data.

2. 2

   Inspect connectors: Locate the AC Control Module and inspect the pins for corrosion, moisture ingress, or pushed-out pins.

3. 3

   Perform CAN BUS network test: With the battery disconnected, check resistance across CAN High and CAN Low pins at the AC module connector (should read approximately 60 ohms).

4. 4

   Test continuity: Check the CAN wires from the AC module harness back to the main cab bulkhead connector and the Engine ECU for chafing or breaks.

5. 5

   Verify power and ground: Ensure the AC module is receiving stable 12V power and has a clean ground connection to prevent it from dropping off the CAN network.

1. 1

   Disconnect Power

   Turn off the ignition and disconnect the negative battery terminal to prevent electrical spikes.

2. 2

   Access the Module

   Remove the interior cab trim panels required to access the AC Control Module.

3. 3

   Repair Wiring

   If the diagnostic phase revealed a broken or chafed CAN wire, splice and solder the repair, sealing it with dual-wall heat shrink. If a connector pin is corroded, de-pin the connector and crimp a new terminal.

4. 4

   Replace the AC Module

   If the wiring tests perfectly and the Engine ECU is confirmed to be broadcasting RPM data, the CAN transceiver inside the AC module has likely failed. Unplug the faulty module, unbolt it from its mounting bracket, and install the replacement unit.

5. 5

   Reassembly

   Reconnect the wiring harnesses and reinstall the cab trim panels.

6. 6

   Clear Codes and Calibrate

   Reconnect the battery. Connect a diagnostic tool (such as AGCO EDT) to the tractor's diagnostic port, clear the inactive 10.02.24 fault code, and start the tractor. Engage the AC to verify that the compressor now receives the signal and engages properly.