Fendt 1.2.38 – EDC Control Module (A021): Function failure EDC Control Module "Engine - Stop"

This code indicates a functional failure within the Electronic Diesel Control (EDC) module related to the engine stop mechanism (specifically the EDC relay delay time control / engine stop circuit). When this fault is active, the system defaults to a restricted operating mode, resulting in reduced engine power and limited torque.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Farmer 409 Vario
• Farmer 410 Vario
• Farmer 411 Vario
• Farmer 412 Vario
• Favorit 711 Vario
• Favorit 712 Vario
• Favorit 714 Vario
• Favorit 715 Vario
• Favorit 716 Vario
• Favorit 717 Vario
• Favorit 916 Vario
• Favorit 920 Vario
• Favorit 924 Vario
• Favorit 926 Vario
• Favorit 930 Vario
• 815 Vario
• 817 Vario
• 818 Vario
• 300 Vario Series

1. 1

   Voltage Supply Check: Check the main voltage supply (+UB) to the EDC Control Module (A021).

2. 2

   Ignition Circuit Check: Verify that the ignition lock (S002) is properly connecting supply voltage (UB 15) to the Engine Control module A021 at Connector X048.

3. 3

   Relay Delay Time Control (Test 25): Run the specific diagnostic test for the EDC Relay Delay Time Control (Engine Stop) using the FENDIAS/Serdia diagnostic tool.

4. 4

   Wiring and Connector Inspection: Inspect the wiring harness for discontinuities or short circuits, specifically focusing on the EDC Control Module connectors (X047 and X048).

5. 5

   CAN-Bus Communication: Check the CAN-Bus connection between the Enhanced Control Module (A002) and the EDC Control Module (A021) to ensure the module is communicating properly on the network.

1. 1

   Read Active Codes

   Connect the FENDIAS or Serdia diagnostic interface to confirm 1.2.38 is active and check for any secondary voltage or CAN-bus codes.

2. 2

   Inspect Fuses

   Locate and test the fuses supplying power to the EDC control module. Replace any blown fuses and trace the circuit for shorts to ground if a fuse immediately pops.

3. 3

   Test Harness Connections

   Disconnect connectors X047 and X048 at the A021 EDC module. Inspect the pins for corrosion, moisture intrusion, or pushed-out terminals.

4. 4

   Verify Power and Ground

   Using a multimeter, probe the harness side of the EDC connectors to ensure steady battery voltage and solid ground when the key is in the ON position.

5. 5

   Check Engine Stop Relay

   Test the engine stop relay (K021) and its associated wiring, as failures in the engine stop solenoid valve or relay circuit can trigger related A021 engine stop faults.

6. 6

   Replace and Reprogram

   If the wiring harness, relays, and power supply are all intact and within specification, the EDC Control Module (A021) has suffered an internal failure. Replace the module. Note: A new EDC module will require EOL (End of Line) programming via the dealer diagnostic tool to match the engine control unit to the specific tractor model.