New Holland ENG 1803 – ISM-IDI ENGINE: Diesel Particulate Filter (DPF) OUT Temperature sensor: Out of Voltage - High.

The engine control system is receiving a voltage signal from the DPF OUT temperature sensor that exceeds the normal operating range. In automotive and agricultural electrical systems, an "Out of Voltage - High" condition typically indicates an open circuit (such as a disconnected sensor, broken wire, or failed internal thermistor) or a short to a power source.

• L213
• L215
• L218
• L220
• L223
• L225
• L230
• SR130
• SR150
• SR175
• SR210
• SR220
• SR250
• C227
• C232
• C238
• W50C
• W60C
• W70C
• W80C
• W130C
• W170C
• W190C
• W230C
• W270C
• W300C
• B90B
• B100B

1. 1

   Check the DPF OUT temperature sensor (located downstream of the Diesel Particulate Filter) to ensure it is securely plugged in

2. 2

   Inspect the wiring harness between the sensor and the Engine ECU for chafing, melted insulation from exhaust heat, or broken wires that would cause an open circuit

3. 3

   Disconnect the sensor and inspect the connector pins for corrosion, moisture, or damage

4. 4

   Test the sensor's resistance with a multimeter to see if the internal element has failed open

5. 5

   Check the harness side with the key ON to verify the ECU is sending the proper reference voltage

1. 1

   Safety First

   Turn off the machine, disconnect the battery, and allow the exhaust system to cool completely to prevent severe burns.

2. 2

   Locate the Sensor

   Find the DPF OUT temperature sensor on the exhaust pipe, positioned immediately after the Diesel Particulate Filter assembly.

3. 3

   Disconnect

   Unplug the electrical connector from the sensor harness.

4. 4

   Remove

   Using an appropriately sized wrench or sensor socket, carefully unscrew the faulty temperature sensor from the exhaust bung. (Note: Penetrating oil may be required if the sensor is seized from exhaust heat).

5. 5

   Install

   Thread the new exhaust gas temperature sensor into the exhaust pipe and tighten it securely.

6. 6

   Reconnect

   Plug the sensor's electrical connector back into the machine's wiring harness.

7. 7

   Clear Codes

   Reconnect the battery, turn the key on, and use a diagnostic scan tool to clear the ENG 1803 fault code. Start the engine and verify that the code does not return and that the ECU is reading a normal temperature value.