Massey Ferguson E 1136 (2) – Engine Control Unit (ECU): ECU temperature NO SIGNAL

The Engine Control Unit has lost communication with its own internal temperature sensor. This indicates an open circuit, a missing signal, or an internal hardware failure of that specific sensor.

• Massey Ferguson 8600 Series
• Massey Ferguson 7600 Series
• Massey Ferguson 5400 Series
• Massey Ferguson 6400 Series

1. 1

   Check ECU Power and Ground: Inspect the main wiring harness connectors at the ECU. Ensure the 5V DC reference supplies (SPN 9021/9022) and battery voltage signals are stable, as voltage drops or spikes can cause internal ECU logic errors.

2. 2

   Check for Overheating: Ensure the ECU is not being subjected to extreme external heat (e.g., missing heat shields, exhaust leaks) that could have damaged the internal board.

3. 3

   Diagnostic Tool Verification: Connect the AGCO WinEEM3 or WinEEM4 Service Tool. Read the live data for the ECU internal temperature. If the value reads as a default placeholder, erratic noise, or 'No Signal,' the internal sensor has failed.

1. 1

   Disconnect battery

   Disconnect the tractor's battery (negative terminal first) to prevent electrical spikes.

2. 2

   Disconnect harness

   Disconnect the main wiring harness from the Engine Control Unit.

3. 3

   Clean and inspect connectors

   Clean the harness connectors with electrical contact cleaner and inspect for pushed-back pins or moisture intrusion. Reconnect and test.

4. 4

   Evaluate ECU

   If the E 1136 (2) code remains active and cannot be cleared, the ECU itself is defective.

5. 5

   Remove ECU

   Remove the ECU from its mounting bracket.

6. 6

   Repair or replace ECU

   The ECU must either be sent to a specialized agricultural mechatronics repair facility (such as Ilgenfritz Mechatronics) for internal board repair, or replaced entirely.

7. 7

   Reprogram ECU

   If a new or remanufactured ECU is installed, it must be flashed with the correct engine software and paired with the tractor's CAN ID module using the AGCO Service Tool.