Massey Ferguson 10.03.26 – AC Module (AIRCON): No Engine Coolant Temperature Information Received On The CAN BUS To AC Module (AIRCON)

This indicates a communication failure on the tractor's Controller Area Network (CAN BUS). The Air Conditioning (AC) module relies on engine coolant temperature data to regulate cab climate and prevent system damage, but it is currently not receiving this 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 Engine ECU faults regarding the Engine Coolant Temperature (ECT) sensor to see if the sensor is dead.

2. 2

   Verify if the engine coolant temperature gauge on the instrument cluster is working to isolate the issue to the CAN BUS wiring.

3. 3

   Inspect the CAN BUS wiring harness between the Engine ECU and the AC Module for chafed wires, rodent damage, or pinched lines.

4. 4

   Disconnect the AC Module and check the connector pins for corrosion, moisture ingress, or pushed-out pins.

1. 1

   Access diagnostic mode

   Use the tractor's display panel or dashboard to confirm 10.03.26 is active and check for accompanying Engine ECU codes.

2. 2

   Resolve sensor issues

   If an ECT sensor code is present in the Engine ECU (sensor failure cause), replace the Engine Coolant Temperature sensor and clear the codes.

3. 3

   Repair CAN BUS wiring

   If the sensor is functioning but the AC module isn't receiving data (wiring failure cause), use a multimeter to test continuity and resistance of the CAN High and CAN Low lines between the Engine ECU and the AC Module. Repair any breaks or shorts in the harness.

4. 4

   Clean connectors

   Apply electrical contact cleaner to the AC module harness connectors and reconnect securely.

5. 5

   Replace AC module

   If the wiring is perfectly intact, the CAN BUS network is healthy, and the ECT data is verified as broadcasting (module failure cause), the CAN transceiver inside the AC Module has likely failed. Replace the AC Module.

6. 6

   Clear codes

   Enter the diagnostic menu and clear the stored fault codes, then run the tractor to verify the AC system operates and the code does not return.