P244D
DTC P244D
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P244D
- Catalyst High Temperature During Regeneration
Circuit/System Description
The diesel oxidation catalyst (DOC) or catalytic converter, main function is to control emissions of Non Methane Hydro Carbons (NMHC) and soluble organic fraction (SOF). The secondary function of the catalytic converter is to assist with the diesel particulate filter (DPF) regeneration, by obtaining and sustaining the temperature necessary for regeneration. The engine control module (ECM) monitors the exhaust gas temperature (EGT) sensors.
Conditions for Running the DTC
* DTC P0545, P0546, P2032, P2033, P2080, P2084, P242B, P242C, P242D, P246F, P2470 and P2471 are not set.
* The engine speed is greater than 600 RPM.
* The DTCs run continuously once the above conditions are met.
Conditions for Setting the DTC
The ECM detects the exhaust gas temperature sensor 1 and 2 are greater than 800°C (1,472°F) for greater than 6 s.
Or
The ECM detects the exhaust gas temperature sensor 3 and 4 are greater than 800°C (1,472°F) for greater than 6 s.
Action Taken When the DTC Sets
* DTCs P244D is a Type A DTC.
* The driver information center, if equipped, displays Reduced Engine Power message.
Conditions for Clearing the DTC
DTCs P244D is a Type A DTC.
Diagnostic Aids
* If the engine has sat overnight, all EGT sensor values should be within 3°C (5°F).
* After starting a cold engine, the EGT sensors temperature should rise steadily, then stabilize.
* High resistance in any of the circuits of the EGT sensors could set a DTC.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation Reference
Exhaust Aftertreatment System Description (Emission Control Systems)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. Verify no other DTCs are set.
• If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.
2. Measure and record the resistance of the B131 exhaust gas temperature sensor 1, 2, 3, and 4. Compare the measurements to the Temperature Versus Resistance (IAT Sensor 2) (Temperature Versus Resistance (IAT Sensor 2)) Temperature Versus Resistance (EGT Sensors) (Temperature Versus Resistance (EGT Sensors)) Temperature Versus Resistance (ECT Sensors) (Temperature Versus Resistance (ECT Sensors)) Temperature Versus Resistance (EGR Temperature Sensors) (Temperature Versus Resistance (EGR Temperature Sensors)) Temperature Versus Resistance (EGT Sensors 3 and 4) (Temperature Versus Resistance (EGT Sensors 3 and 4)) Temperature Versus Resistance (Fuel Temperature Sensor) (Temperature Versus Resistance (Fuel Temperature Sensor)) table. The resistance values should be within the specified range indicated in the table.
• If not within the specified range, replace the appropriate exhaust gas temperature sensor.
3. Remove the Q57 indirect fuel injector outlet nozzle from the exhaust. Connect a piece of hose to the Q57 indirect fuel injector outlet nozzle and place the other end into a suitable container.
4. Engine idling, observe the Q57 indirect fuel injector. The injector should not be leaking.
• If the Q57 indirect fuel injector is leaking, replace the Q57 indirect fuel injector.
5. Inspect for the following conditions:
* Leaks in the exhaust system-Refer to Exhaust Leakage (Exhaust Leakage).
* Leaks in the intake air ducts and the turbocharger ducts. Perform the Induction System Smoke Test in Charge Air Cooler Diagnosis (Induction System Smoke Test) (Charge Air Cooler Diagnosis (Induction System Smoke Test)) Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) (Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test)) Charge Air Cooler Diagnosis (Full System Air Leak Test) (Charge Air Cooler Diagnosis (Full System Air Leak Test)).
* Leaking Q17 fuel injectors-Refer to Fuel Injector Diagnosis (Fuel Injector Diagnosis)
* Engine cooling system condition-Refer to Engine Overheating (Engine Overheating)
* An engine mechanical condition-Refer to Symptoms - Engine Mechanical (Symptoms - Engine Mechanical).
• If a condition is found, repair as necessary.
6. Inspect the SCR/DPF and the catalytic converter for any of the following conditions:
* Physical damage or alterations
* Internal rattles caused by a damaged catalyst substrate
* Internal restrictions--Refer to Restricted Exhaust (Restricted Exhaust).
• If a condition is found, replace the SCR/DPF or the catalytic converter.
7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Catalytic Converter Replacement (V6) (Catalytic Converter Replacement) Catalytic Converter Replacement (V8) (Catalytic Converter Replacement) Catalytic Converter Replacement (LMM) (Catalytic Converter Replacement) Catalytic Converter Replacement (LGH) (Catalytic Converter Replacement)
* Exhaust Temperature Sensor Replacement - Position 1 (Exhaust Temperature Sensor Replacement - Position 1)
* Exhaust Temperature Sensor Replacement - Position 2 (Exhaust Temperature Sensor Replacement - Position 2)
* Exhaust Temperature Sensor Replacement - Position 3 (Exhaust Temperature Sensor Replacement - Position 3)
* Exhaust Temperature Sensor Replacement - Position 4 (Exhaust Temperature Sensor Replacement - Position 4)
* Exhaust Particulate Filter Replacement (LMM) (Service and Repair) Exhaust Particulate Filter Replacement (20 Series) (Service and Repair) Exhaust Particulate Filter Replacement (35 Series) (Service and Repair)
* Indirect Fuel Injector Replacement (Indirect Fuel Injector Replacement)
* Perform the following scan tool reset procedures after replacing the SCR/DPF:
1. NOx Catalyst Reductant Loading Reset
2. NOx Catalyst Reset
3. DPF/Catalyst 2 Reset
4. Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration)
* Perform the following scan tool reset procedures after replacing the Catalytic Converter:
1. NOx Catalyst Reductant Loading Reset
2. Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration)