New Holland ENG 3797 – ENGINE Controller: Diesel Particulate Filter (DPF) Pressure Sensor: SRC High for Particulate Filter Differential Pressure Sensor

The Engine Control Unit (ECU) is receiving a voltage signal from the DPF Differential Pressure Sensor that exceeds the maximum allowable threshold. This condition typically indicates an electrical fault, such as a short circuit to a power source on the signal wire, an open circuit on the sensor's ground wire, or an internal failure of the sensor itself.

• L225
• L230
• C232
• C238
• L316
• L318
• L320
• T6 series
• CR9090
• CX8080
• CX8090

1. 1

   Verify the ENG 3797 code is active using the Electronic Service Tool (EST).

2. 2

   Visually inspect the DPF Differential Pressure Sensor, wiring harness, and connector for chafing, melting, corrosion, or loose pins.

3. 3

   Test the sensor's signal wire for a short to battery voltage/power.

4. 4

   Test the sensor's ground circuit for an open connection.

5. 5

   Inspect the two hoses running from the DPF to the sensor to ensure they are not melted, cracked, or clogged with soot.

6. 6

   Verify proper 5V reference, good ground, and continuity on the signal wire to the ECU to determine if the sensor has failed internally.

1. 1

   Preparation

   Turn off the machine, remove the key, and disconnect the battery to prevent electrical shorts during repair.

2. 2

   Locate the Sensor

   Find the DPF Differential Pressure Sensor, which is typically mounted near the DPF assembly and connected to it via two small pressure hoses.

3. 3

   Disconnect

   Unplug the electrical connector from the sensor.

4. 4

   Remove Hoses

   Carefully release the hose clamps and pull the upstream and downstream pressure hoses off the sensor. Note which hose goes to which port, as reversing them will cause immediate fault codes.

5. 5

   Remove Sensor

   Unbolt the sensor bracket and remove the faulty sensor.

6. 6

   Install New Part

   Mount the new DPF Differential Pressure Sensor and secure the bolts.

7. 7

   Reconnect

   Reattach the pressure hoses to their correct ports and secure the clamps. Plug in the electrical connector.

8. 8

   ECU Reset

   Reconnect the battery. Connect the Electronic Service Tool (EST). Navigate to the emissions configuration menu, select the Differential Pressure Sensor (Delta P), and click the 'RESET' button to initialize the new component with the ECU.

9. 9

   Clear and Test

   Clear the inactive fault codes, start the engine, and verify that code 3797 does not return.