Fendt B042 – EMR: Crankshaft Push Mode Fault

The EMR system has detected a signal error or complete loss of signal from the crankshaft position sensor. This can be caused by wiring damage, an incorrect sensor gap, or sensor failure. When active, the engine control system substitutes the missing signal with the camshaft sensor (B041) to maintain operation. This fault can trigger an overspeed shutoff and cause the tractor to enter 'Push' mode.

• 300 Vario (COM III)
• 400 Vario (COM III)
• 700 Vario (COM III)
• 712 Vario (COM III)
• 714 Vario (COM III)
• 716 Vario (COM III)
• 718 Vario (COM III)
• 800 Vario (COM III)
• 818 Vario (COM III)
• 820 Vario (COM III)
• 900 Vario (COM III) up to 930

1. 1

   Connect to the tractor using the SERDIA diagnostic software to read the exact fault code and any associated codes.

2. 2

   Inspect the wiring harness and connector for the crankshaft position sensor for signs of damage, corrosion, loose pins, or breaks in the cable.

3. 3

   Verify the air gap between the crankshaft sensor and the flywheel using a feeler gauge (often around 0.030" to 0.060" or 0.8mm to 1.5mm).

4. 4

   Using a multimeter, test the sensor's resistance and check for a voltage signal while cranking the engine.

5. 5

   Review other active or stored fault codes, paying particular attention to any fault with the camshaft sensor (B041).

1. 1

   Safety First

   Ensure the tractor is on level ground, the engine is off, and the battery is disconnected to prevent electrical shorts.

2. 2

   Locate the Sensor

   Locate the crankshaft sensor on the engine block, positioned to read the teeth of the flywheel.

3. 3

   Disconnect the Electrical Connector

   Carefully unplug the electrical connector from the sensor. Inspect the connector for any damage or corrosion and clean if necessary.

4. 4

   Remove the Old Sensor

   Unscrew the retaining bolt that holds the sensor in place and remove the sensor from the engine block.

5. 5

   Install the New Sensor

   Insert the new crankshaft position sensor into its mounting hole.

6. 6

   Set the Air Gap

   If the sensor mounting is adjustable, set the correct air gap between the sensor tip and the flywheel teeth according to the manufacturer's specifications.

7. 7

   Secure the Sensor

   Reinstall and tighten the retaining bolt to the manufacturer's specified torque.

8. 8

   Reconnect and Test

   Reconnect the electrical connector, ensuring it clicks securely into place. Reconnect the battery.

9. 9

   Clear Fault Codes

   Start the engine and use a diagnostic tool to clear the B042 fault code from the EMR module. Verify that the code does not reappear.