Fendt 1.2.04 – EMR: B041, B042 - Sensor, EMR camshaft / crankshaft — Overspeed shutoff.

This code indicates that the engine management system has detected an engine overspeed condition via the camshaft (B041) and/or crankshaft (B042) position sensors. As a protective measure, the system triggers an automatic engine shutoff. The tractor will subsequently be forced into 'Push' mode, and the diesel engine will die. This can be caused by a genuine overspeed event, a failing sensor providing erratic high-speed signals, an incorrect sensor gap, or damaged wiring.

• 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
• Fendt 300 Vario
• Fendt 400 Vario
• Fendt 700 Vario
• Fendt 800 Vario
• Fendt 900 Vario
• 916
• 920
• 924
• 926
• 930

1. 1

   Inspect the wiring harnesses for both the B041 (camshaft) and B042 (crankshaft) sensors for breaks, chafing, or short circuits.

2. 2

   Check the physical gap between the sensors and the camshaft sprocket/flywheel. A gap that is too wide will cause signal errors and dropouts.

3. 3

   Use an oscilloscope to check the peak-to-peak voltage and amplitude of the signals coming from the sensors. A weak or erratic signal can trick the EMR into reading an overspeed condition.

4. 4

   Check the EMR actuator (Y035) using the SERDIA (Deutz) diagnostic program.

1. 1

   Access the Sensors

   Locate the B041 camshaft position sensor (near the camshaft sprocket) and the B042 crankshaft position sensor (near the flywheel).

2. 2

   Test and Adjust

   If the wiring is intact but the signal is weak, adjust the sensor depth/gap to the manufacturer's specification.

3. 3

   Replace Faulty Components

   If a sensor fails the oscilloscope test or has internal resistance failure, replace the faulty sensor(s). Note: If both sensors fail simultaneously, the engine will not run at all.

4. 4

   Check the Y035 Actuator

   If the sensors are functioning perfectly, the fault may lie in the EMR actuator (Y035) failing to regulate fuel/speed properly. Replace if it fails the SERDIA diagnostic test.

5. 5

   Clear Codes

   Connect the SERDIA diagnostic tool to the diagnostic connector (X412) to clear the fault memory and reset the EMR.