John Deere 000108.07 – ECU: Faulty Internal Barometric Sensor Signal

The internal barometric pressure sensor is not providing a valid signal to the Engine Control Unit (ECU). A Failure Mode Identifier (FMI) of 07 indicates that the mechanical system is not responding properly or the signal is invalid, meaning the signal is stuck, not changing as expected, or incorrect even if it falls within the normal voltage range. This prevents the ECU from accurately adjusting the air-fuel mixture and other engine parameters for optimal performance and emissions control at different altitudes.

• 9660 STS Combine
• 9760 STS Combine
• 450D LC Excavator

1. 1

   Perform a visual inspection of the barometric pressure sensor and its wiring harness for cracks, corrosion, loose connections, or debris obstructing the sensor's port.

2. 2

   Check for other active fault codes; multiple sensor-related codes could indicate a broader issue with the sensor power supply or a shared wiring harness.

3. 3

   Disconnect the sensor's electrical connector and inspect the pins for corrosion, moisture, or a loose fit.

4. 4

   Perform a power and ground test using a multimeter to verify the sensor is receiving approximately 5 volts from the ECU and has a solid ground connection.

5. 5

   Perform a 'wiggle test' by gently moving the wiring harness while monitoring the voltage to check for intermittent connections.

6. 6

   Test the signal wire voltage with the ignition on and engine off. The voltage should typically be between 2.5 and 4.5 volts depending on atmospheric pressure. A static reading or a reading outside this range indicates a faulty sensor.

1. 1

   Disconnect battery

   Disconnect the negative battery terminal to prevent any electrical shorts before beginning the repair.

2. 2

   Locate the sensor

   Locate the barometric pressure sensor. Common locations include on the air intake piping near the air filter housing, mounted on top of the engine's valve cover, or integrated with the intake air temperature sensor.

3. 3

   Remove the old sensor

   Disconnect the electrical connector from the sensor. Use a wrench or socket to carefully remove the sensor from its mounting location.

4. 4

   Install the new sensor

   Thread the new sensor into place by hand to avoid cross-threading, then tighten it to the manufacturer's specified torque. Do not overtighten.

5. 5

   Reconnect and secure

   Reconnect the electrical connector to the new sensor, ensuring it clicks into place for a secure connection.

6. 6

   Reconnect battery

   Reattach the negative battery terminal.

7. 7

   Clear fault codes

   Use a diagnostic scanner to clear the 000108.07 fault code from the ECU.

8. 8

   Verify the repair

   Start the engine and let it run for a few minutes. Re-scan for fault codes to ensure the issue is resolved. If required by the system, perform a calibration procedure for the new pressure sensor through the machine's display or diagnostic tool.