New Holland ENG 3887 – ENGINE controller (ECU): Diesel Oxidation Catalyst (DOC) IN Temperature is over 700 °C (1292 °F)

The exhaust gas temperature sensor located at the inlet of the DOC is detecting an abnormally high temperature that exceeds the safe operating threshold, which triggers an Amber warning level.

• L213
• L215
• L216
• L218
• L220
• L223
• L225
• L230
• L313
• L316
• L318
• L320
• SR130
• SR150
• SR160
• SR175
• SR200
• SR210
• SR220
• SR240
• SR250
• SR270
• SV185
• SV250
• SV280
• SV300
• SV340
• TR270
• TR310
• TR320
• TR340
• TV370
• TV380
• TV450
• TV620

1. 1

   Check for related sensor circuit fault codes (1801, 1802, 1805) that might indicate a failed sensor rather than an actual overheating event.

2. 2

   Inspect the DOC inlet temperature sensor (exhaust gas temp sensor #1) wiring harness and connector for melting, chafing, or an open/short circuit.

3. 3

   Test the resistance between the sensor pins (typically pins 2 and 3) using a multimeter to determine if the sensor has failed internally.

4. 4

   Evaluate the exhaust/burner system to see if raw fuel is entering the exhaust (over-fueling injector) or if there is a malfunction in the DPF burner/regeneration system causing a runaway thermal event.

1. 1

   Cool Down

   Ensure the machine is turned off and the exhaust system has been allowed to cool completely. The DOC/DPF assembly reaches extreme temperatures and poses a severe burn hazard.

2. 2

   Locate the Sensor

   Locate the DOC inlet temperature sensor (exhaust gas temp sensor #1) at the front/inlet section of the Diesel Oxidation Catalyst assembly.

3. 3

   Disconnect

   Unplug the electrical connector from the sensor harness.

4. 4

   Remove

   Carefully unscrew the temperature sensor from the exhaust pipe/DOC housing.

5. 5

   Prepare the New Sensor

   Apply a high-temperature anti-seize compound to the threads of the new sensor (be careful not to get any on the sensor probe itself).

6. 6

   Install

   Thread the new sensor into the DOC inlet. Torque the exhaust temperature sensor to the manufacturer specification (typically 25 - 35 N·m or 18.4 - 25.8 lb-ft).

7. 7

   Reconnect

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

8. 8

   Clear Codes

   Use a diagnostic tool or CAN-Bus DTC Eraser to clear the ENG 3887 fault code from the Engine ECU. Run the machine and monitor the DOC intake temperature to verify the repair.