Fendt 1.2.21 – Engine Control Unit (ECU / EDC 7): K063 - Heater flange relay

Break in wiring or short circuit, or the relay is incorrectly connected, causing the pre-heater (grid heater) to become inoperable and resulting in cold-start issues.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series
• 900 Vario COM III
• 800 Vario S4

1. 1

   Check operating conditions to ensure ambient/engine temperature is less than 5°C (41°F), as the heater flange only engages below this threshold.

2. 2

   Measure voltage at the K063 relay Terminal 86 (inductive input) — it should read 0 VDC when inactive and 12 VDC when active (indicator lamp in the A007 instrument panel illuminated).

3. 3

   Inspect the wiring harness leading to the relay for a cable break or short circuit (refer to Wiring Diagram Sheet 36).

4. 4

   Connect the SERDIA program to read the fault log, check sensor values, and run a function test on the actuators.

1. 1

   Ensure the tractor is turned off and the battery disconnect relay (K068/K069) is open to safely work on the electrical system.

   Safety precaution before working on the electrical system.

2. 2

   Locate the K063 heater flange relay.

   Refer to your specific model's component location chart.

3. 3

   Remove the fixing bolts securing the K063 heater flange relay.

   Prepare the relay for removal.

4. 4

   Pull the relay to one side and disconnect the wiring harness.

   Disconnect the relay from the electrical system.

5. 5

   Inspect the connector pins for corrosion, melting, or pushed-out pins.

   These conditions would cause the 'incorrectly connected' or 'open circuit' fault.

6. 6

   Repair any damaged wiring on the harness side.

   Perform repairs per Wiring Diagram Sheet 36.

7. 7

   Install a new K063 relay if the relay coil is internally shorted or open.

   Secure it with the fixing bolts.

8. 8

   Reconnect the battery and use the SERDIA tool to delete the error code.

   Clear FC:0011, FC:0013, or FC:0014 from the EDC memory depending on the exact sub-code.