P246F
DTC P2080, P2084, P242B, or P246F
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 P2080
- Exhaust Gas Temperature Sensor 1 Performance
DTC P2084
- Exhaust Gas Temperature Sensor 2 Performance
DTC P242B
- Exhaust Gas Temperature Sensor 3 Performance
DTC P246F
- Exhaust Gas Temperature Sensor 4 Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The exhaust gas temperature sensors are variable resistors that measure the temperature of the exhaust gas at the inlet and outlet of the diesel oxidation catalyst and the inlet and outlet of the Diesel Particulate Filter (DPF). The Engine Control Module (ECM) supplies a 5 volt bias to the exhaust gas temperature sensor signal circuit and supplies a ground to the low reference circuit. The exhaust gas temperature information is used by the ECM during the particulate filter cleaning process.
The following table illustrates the relationship between the temperature of the exhaust gas, and the resistance and voltage seen at the exhaust gas temperature sensor.
Conditions for Running the DTC
P2080
* DTC P007C, P007D, P0097, P0098, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0401, P0402, P0403, P0405, P0406, P046C, P0545, P0546, P111C, P111D, P20E2, P2032, P2033, P2228 or P2229 is not set.
* The engine is running for at least 327 s.
* The engine speed is between 700-3000 RPM for 60 s.
* The calculated fuel rate is between 5-80mm(3) for 60 s.
* DPF regeneration or exhaust gas temperature monitoring has not been active in the last 25 minutes.
* Exhaust gas temperature sensor 1 has changed less than 7°C (12.6°F) in 5 s.
* The DTC runs continuously when the above conditions are met.
P2084
* DTC P007C, P007D, P0097, P0098, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0401, P0402, P0403, P0405, P0406, P046C, P0545, P0546, P111C, P111D, P20E2, P2032, P2033, P2228 or P2229 is not set.
* The engine is running for at least 327 s.
* The engine speed is between 700-3000 RPM for 60 s.
* The calculated fuel rate is between 5-80mm(3) for 60 s.
* DPF regeneration or exhaust gas temperature monitoring has not been active in the last 25 minutes.
* Exhaust gas temperature sensor 2 has changed less than 7°C (12.6°F) in 5 s.
* The DTC runs continuously when the above conditions are met.
P242B
* DTC P007C, P007D, P0097, P0098, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0401, P0402, P0403, P0405, P0406, P046C, P111C, P111D, P113A, P20E2, P2032, P2033, P2228, P2229, P242C, or P242D is not set.
* The engine is running for at least 327 s.
* The engine speed is between 700-3000 RPM for 60 s.
* The calculated fuel rate is between 5-80mm(3) for 60 s.
* DPF regeneration or exhaust gas temperature monitoring has not been active in the last 25 minutes.
* Exhaust gas temperature sensor 3 has changed less than 7°C (12.6°F) in 5 s.
* The DTC runs continuously when the above conditions are met.
P246F
* DTC P007C, P007D, P0097, P0098, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0401, P0402, P0403, P0405, P0406, P046C, P111C, P111D, P113A, P20E2, P2228, P2229, P242C, P242D, P2470 or P2471 is not set.
* The engine is running for at least 327 s.
* The engine speed is between 700-3000 RPM for 60 s.
* The calculated fuel rate is between 5-80mm(3) for 60 s.
* DPF regeneration or exhaust gas temperature monitoring has not been active in the last 25 minutes.
* Exhaust gas temperature sensor 4 has changed less than 7°C (12.6°F) in 5 s.
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects the difference between the actual and calculated exhaust gas temperatures is greater than 100°C (180°F) or less than -100°C (-180°F) for greater than 50 s.
Action Taken When the DTC Sets
DTCs P2080, P2084, P242B and P246F are Type B DTCs.
Conditions for Clearing the DTC
DTCs P2080, P2084, P242B and P246F are Type B DTCs.
Diagnostic Aids
* If the engine has cooled overnight, all exhaust gas temperature sensors and the engine coolant temperature sensor values should display within 3°C (5°F).
* During and after a DPF regeneration or exhaust gas temperature monitoring request, the diagnostic will be delayed for 25 minutes.
* If the vehicle was in a DPF regeneration or exhaust gas temperature monitoring condition at shut off, and then restarted within 60 minutes, the diagnostic is delayed for 25 minutes after engine start. If restarted at greater than 60 minutes engine off, the normal 327 s delay is in effect.
* After starting a cold engine, the exhaust gas temperature sensors temperature should rise steadily, then stabilize after the engine reaches operating temperature.
* High resistance in either circuit of an exhaust gas temperature sensor 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)
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
Special Tools
J 25070 - Heat Gun 500-700°F
For equivalent regional tools, refer to Special Tools (Tools and Equipment).
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. Engine running, observe the DTC information with a scan tool. DTCs P2080, P2084, P242B or P246F should not set.
3. 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.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B131 exhaust gas temperature sensor.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the low reference circuit terminal 2 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
3. Ignition ON, verify the scan tool EGT Sensor parameter is greater than 998°C (1,828°F).
• If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
4. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool EGT Sensor parameter is less than -35°C (-31°F).
• If greater 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 K20 ECM.
5. If all circuits test normal, test or replace the B131 Exhaust Gas Temperature Sensor.
Component Testing
Note: The J 25070 - heat gun may be used to evaluate the sensor under high temperature conditions.
Measure and record the resistance of the affected B131 exhaust gas temperature sensor and 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)).
If not within the specified range, replace the B131 Exhaust Gas Temperature Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* 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)
* Control Module References (Programming and Relearning) for ECM replacement, setup and programming