The engine control module (ECM) supplies 5 volts to the exhaust gas temperature 1 sensor on the 5-volt reference circuit. The ECM also provides a ground on the low reference circuit. The exhaust gas temperature 1 sensor provides a signal to the ECM on the exhaust gas temperature 1 signal circuit which is relative to the pressure changes in the manifold. The ECM should detect a low signal voltage at a exhaust gas temperature 1, such as low engine load. The ECM should detect high signal voltage at a high exhaust gas temperature 1, such as high engine load. The ECM monitors the exhaust gas temperature 1 sensor signal for voltage outside the normal range of the exhaust gas temperature 1 sensor.

The ECM detects that the catalyst temperature is continuously low.

DTC P244C is a Type A DTC.

DTC P244C is a Type A DTC.

An incorrectly installed DOC exhaust gas temperature sensor will cause this DTC to set.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Verify the integrity of the engine exhaust system and fuel system by inspecting for the following conditions:

Important: You must perform Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the DOC exhaust gas temperature 1 sensor.
2. Ignition OFF, using a DMM, measure the voltage between the signal circuit and a low reference circuit.

⇒	If less than 4.8 volts, test the low reference circuit for an open/high resistance.

3. Ignition ON, verify the scan tool exhaust gas temperature 1 parameter is more than 950°C (1742°F).

⇒	If greater than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the control module.

4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit . Verify the scan tool exhaust gas temperature 1 parameter is less than 50°C (122°F).

⇒	If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the control module.

⇒	If all circuits test normal, test or replace the exhaust gas temperature 1 sensor.

5. Ignition ON for longer than 30 seconds, learning the zero position of DPF differential pressure.
6. Perform the DPF regeneration.
7. Start the engine and operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze Frame/Failure Records.

⇒	If detect the DTC, replace the control module.

8. Ignition OFF, inspect the DPF filter.

⇒	If a broken, clogged, or melted DPF filter is found, replace the DPF filter.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.