John Deere 000108.02 – ECU: Barometric Pressure Sensor Fault

The Engine Control Unit (ECU) has detected an invalid signal or problem with the barometric pressure sensor. This sensor measures atmospheric pressure, which is crucial for the ECU to make precise adjustments to the air-fuel mixture and other engine parameters to ensure optimal performance at different altitudes.

• 6230
• 6330
• 6430 Premium
• 7130
• 7230
• 7330
• 7430
• 7530
• 7630
• 7730
• 7830
• 7930
• 8130
• 8230
• 8330
• 8430
• 8530
• 8225R
• 8230T
• 8245R
• 8270R
• 8295R
• 8320R
• 8330T
• 8345R
• 9230
• 9330
• 9430
• 9530
• 9630
• 9570RX
• 9560 STS
• 9660 STS
• 9670 STS
• 9770 STS
• 9870 STS
• S550
• S660
• S670
• 333G
• 316GR
• 318G

1. 1

   Carefully inspect the barometric pressure sensor and its wiring harness for any visible damage, such as chafed or broken wires, and loose or corroded connectors.

2. 2

   Disconnect the sensor's electrical connector and inspect the terminals for cleanliness and a tight fit. Clean any corrosion found.

3. 3

   Using a multimeter, check for a stable 5-volt reference signal at the sensor's connector.

4. 4

   Verify a good ground connection at the sensor connector.

5. 5

   Check the signal wire for continuity back to the ECU.

6. 6

   With the engine running, measure the sensor's output voltage. This reading should typically be between 2.5 and 4.5 volts, depending on the atmospheric pressure at your location. A reading outside of this range often indicates a faulty sensor.

1. 1

   Confirm the fault

   After performing the diagnostic checks, if the wiring is confirmed to be good but the sensor's output is incorrect or the fault code persists, the sensor itself is likely faulty.

2. 2

   Locate the sensor

   The location of the barometric pressure sensor varies depending on the machine. It may be a standalone sensor or integrated with the Manifold Absolute Pressure (MAP) sensor. On some models (e.g., 333G), it is located on top of the valve cover at the flywheel end of the engine.

3. 3

   Replace the sensor

   Disconnect the negative battery terminal. Disconnect the electrical connector from the sensor. Carefully remove any fasteners holding the sensor in place and remove the old sensor. Install the new sensor, ensuring it is seated correctly. Reconnect the electrical connector and the negative battery terminal.

4. 4

   Clear fault codes

   Use a diagnostic tool to clear the 000108.02 fault code from the ECU.

5. 5

   Verify the repair

   Start the engine and let it run to ensure the fault code does not reappear.