Kubota P242D – Engine Control Module (ECM) / Engine ECU: Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 3) / Exhaust gas temperature sensor 2: High

The Engine Control Module (ECM) has detected an abnormally high voltage signal from Exhaust Gas Temperature (EGT) Sensor 2 (T2 sensor) at the DPF outlet, indicating an open circuit or a +B (battery voltage) short circuit in the sensor or its wiring harness.

• L4701
• L3560
• L4060
• L4760
• L5060
• L5460
• L6060
• M100GX
• M110GX
• M4N
• M6
• M8560
• M9960
• SVL65-2
• SVL75-2
• SVL90-2
• SVL95-2s
• SVL97-2s
• KX040-4
• KX057-4
• U55-4
• D1803
• V2403
• V2607
• V3307
• V3800

1. 1

   Visually inspect the EGT Sensor 2 connector and wiring harness for damage, melted insulation, corrosion, or pin contamination. Check for a loose sensor connector on top of the DPF muffler.

2. 2

   Use a diagnostic scan tool to read live data for 'Exhaust Temperature B1S3' or 'DPF Outlet Temp (T2)'. A reading of 0°C (32°F) indicates an open circuit, while 1000°C (1832°F) indicates a short.

3. 3

   Disconnect the sensor and use a multimeter to check the resistance across the sensor's terminals. An open circuit (infinite resistance/OL) or an internal short indicates a failed sensor.

4. 4

   Verify good ground continuity between the sensor harness ground and the chassis/ECU. Check the signal wire for a short to battery voltage (+B).

1. 1

   Safety First

   Turn the key switch to the 'OFF' position. Allow the engine and the DPF muffler assembly to cool completely, as exhaust components reach extreme temperatures.

2. 2

   Locate the Sensor

   Locate Exhaust Gas Temperature Sensor 2 (T2), which is positioned at the outlet of the Diesel Particulate Filter (DPF).

3. 3

   Disconnect

   Unplug the electrical connector for the sensor. Pay attention to the connector color, as Kubota uses color-coding (e.g., Black, Gray, White) to differentiate the EGT sensors in the exhaust stream.

4. 4

   Remove the Sensor

   Use a wrench to carefully unscrew the EGT sensor from the DPF housing. If the sensor is seized, apply penetrating oil to avoid stripping the threads in the exhaust housing.

5. 5

   Install the New Sensor

   Thread the new EGT sensor into the housing. Tighten to the OEM specified torque (Kubota manuals generally specify 48 to 55 N·m / 36 to 41 lbf·ft for standard exhaust sensors, but verify with your specific engine manual).

6. 6

   Reconnect

   Securely click the electrical connector back together, ensuring the locking tab engages so it does not vibrate loose.

7. 7

   Clear Codes

   Use a diagnostic scan tool to clear the P242D fault code from the ECM.

8. 8

   Test

   Start the engine, allow it to warm up, and monitor the live exhaust temperature data to confirm the sensor is reading correctly and the code does not return.