Massey Ferguson E9082 – Engine ECU (EEM): Cam speed sensor, reverse connected

This fault code indicates a specific electrical fault with the camshaft speed sensor. The system has detected that the sensor's wiring polarity is reversed, or the signal being received by the control module is inverted/incorrectly phased relative to the expected pulses from the camshaft trigger wheel.

• 8650
• 8660
• 8670
• 8680
• 8690
• 6400 Series
• 7400 Series
• 8400 Series
• 7256
• 9695
• 9795

1. 1

   Inspect wiring polarity for recent repairs, spliced wires, or repinned connectors where signal and ground wires may be backward

2. 2

   Ensure the sensor connector is fully seated, free of corrosion, and pins are not pushed out or damaged

3. 3

   Verify the reference voltage supply (5V or 12V depending on engine) and ground at the connector using a multimeter

4. 4

   Check the signal wire for continuity from the sensor connector back to the Engine ECU to rule out a short or open circuit

1. 1

   Turn off the engine, remove the key, and disconnect the battery to prevent electrical shorts.

   Turn off the engine, remove the key, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the camshaft speed sensor.

   Locate the camshaft speed sensor. It is mounted directly on the engine's timing gear housing.

3. 3

   Carefully depress the locking tab and disconnect the electrical connector from the sensor.

   Carefully depress the locking tab and disconnect the electrical connector from the sensor.

4. 4

   Remove the retaining bolt holding the sensor to the timing gear housing.

   Remove the retaining bolt holding the sensor to the timing gear housing.

5. 5

   Pull the old sensor straight out of the housing.

   Pull the old sensor straight out of the housing. Clean the area around the port to ensure no dirt falls into the timing gear assembly.

6. 6

   Lubricate the O-ring on the new sensor with a small amount of clean engine oil to prevent tearing during installation.

   Lubricate the O-ring on the new sensor with a small amount of clean engine oil to prevent tearing during installation.

7. 7

   Insert the new sensor into the housing, install the retaining bolt, and tighten it to the OEM torque specification.

   Insert the new sensor into the housing, install the retaining bolt, and tighten it to the OEM torque specification.

8. 8

   Reconnect the electrical connector, ensuring it clicks into place with the correct orientation.

   Reconnect the electrical connector, ensuring it clicks into place with the correct orientation.

9. 9

   Reconnect the battery, start the tractor, and use a diagnostic tool to clear the E9082 fault code.

   Reconnect the battery, start the tractor, and use a diagnostic tool to clear the E9082 fault code. Run the engine to verify the code does not return.