Case IH 19449 – Engine Control Module (ECM) or Vehicle Control Module (VCM): Fault Check for enhanced SRC-Min of third exhaust gas temperature

This code indicates that the third Exhaust Gas Temperature (EGT) sensor in the exhaust aftertreatment system is registering a temperature that is below the minimum threshold required for the emissions system to function properly.

• Tier 4b
• Farmall series (100C, 105A, 105C, 105U, 110A, 110C, 110U, 115A, 115C, 115U, 120U)
• Maxxum series (115, 120, 125, 130, 140, 145, 150)
• Puma series
• Optum series
• Quantum series
• Vestrum series
• N-Series Tractor Loader Backhoes (TLBs)

1. 1

   Inspect the third EGT sensor and its 2-pin wiring harness for physical damage, melted wires, or loose connections

2. 2

   Inspect the exhaust piping upstream of the sensor for leaks that could cause exhaust gases to escape before reaching the sensor

3. 3

   Verify that the engine itself is reaching proper operating temperature (e.g., check for a stuck-open thermostat)

4. 4

   Use a multimeter to test the sensor's resistance/voltage to determine if the internal thermistor has failed out of specification

1. 1

   Cool Down

   Turn off the machine and allow the engine and exhaust system to cool completely. Exhaust aftertreatment components get incredibly hot and pose a severe burn risk.

2. 2

   Locate the Sensor

   Locate Exhaust Gas Temperature Sensor 3 in the exhaust aftertreatment piping.

3. 3

   Disconnect Wiring

   Carefully disconnect the 2-pin Bosch-style electrical connector from the sensor harness.

4. 4

   Remove the Sensor

   Apply penetrating oil to the sensor threads if it appears seized. Use a wrench (typically 17mm) to unscrew the faulty EGT sensor from the exhaust pipe.

5. 5

   Prepare the New Sensor

   Apply a high-temperature anti-seize compound to the threads of the new sensor to make future removal easier. Caution: Do not get anti-seize on the sensor probe itself, as this will skew readings.

6. 6

   Install

   Thread the new sensor into the exhaust pipe and tighten it to the OEM specified torque.

7. 7

   Reconnect

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

8. 8

   Clear Codes

   Use a diagnostic scan tool to clear the 19449 fault code from the ECM/VCM. Run the engine or perform a manual regeneration to verify the sensor is reading correctly and the code does not return.