2014 Chevrolet Cruze 2.0L Eng Diesel
DTC P11D7 or P22FE
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC P11D7 NOx Sensor 2 Performance - Sensing Element Status Signal
DTC P22FE NOx Sensor 2 Performance - Sensing Element
Diagnostic Fault Information
|Circuit||Short to Ground||Open/High Resistance||Short to Voltage||Signal Performance|
|NOx Sensor Ignition Voltage||U029D, U029E, P220A, P220B||U029D, U029E||U029D, U029E, P220A, P220B||-|
|High Speed GMLAN Serial Data (+)||U0074, P205D||U010E, P205D||U0074, P205D||-|
|High Speed GMLAN Serial Data (-)||U029D, U029E, U010E, P205D||U010E, P205D||U010E, P205D||-|
|NOx Sensor Ground||-||U029D, U029E||-||-|
The reductant system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located after the selective catalytic reduction (SCR) and monitors NOx levels downstream of the SCR.
Each NOx sensor contains a sensing cell, a pumping cell and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.
The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.
Conditions for Running the DTCs
Conditions for Setting the DTC
- DTCs P0101, P0234, P0299, P0401, P0402, P140B, P140C, P2200, P2202, P2203, P2205, U029D and U029E are not set.
- Battery voltage is greater than 11 V.
- Ambient air temperature is greater than -7°C (19°F)
- Engine speed is less than 1000 RPM for at least 10 s.
- BARO pressure is greater than 75 kPa (11 psi).
- EGT sensor 3 is between 50-500°C (112-932° F).
- NOx 2 NOx Concentration is less than 200 ppm.
- The DTC runs during key off after-run after the above conditions are met and the fault exists for more than 3 events during a key cycle.
Due to aging and poisoning of the sensor element, the characteristics could change and have to be monitored. Therefore, a self diagnosis is implemented within the sensor control unit which is determining a measurement deviation in relation to a reference point defined during sensor production.
The NOx sensor control unit sends a unique message to the ECM upon the self-diagnosis being aborted. The number of aborts is tracked by the ECM. If the number of self diagnostic aborts exceeds a threshold, the DTC is set.
The NOx sensor self diagnostic result is received from the NOx sensor control unit and stored in a ring buffer, which takes the average of the last calibrated number of test results and averages them for comparison to an upper and lower calibrated threshold. If the average result is greater than or less than the calibrated thresholds, a NOx sensor self diagnostic fault will set.
Action Taken When the DTC Sets
DTC P11D7 and P22FE are Type B DTCs.
Conditions for Clearing the DTC
DTC P11D7 and P22FE are Type B DTCs.
- DTC P11D7 may falsely set while the vehicle is in for service if the vehicle is connected to the repair facilities exhaust ventilation system. This is more prevalent in shops where ventilation systems have strong suction.
- If the vehicle has been started and ran for less than 60 s, then shut down, DTC P11D7 may set.
Engine Controls Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Component View Reference
Powertrain Component Views
Description and Operation
- Exhaust Aftertreatment System Description
- Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level) , Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality) , Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering) , Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control)
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information.
- Ignition On.
- Verify DTC UXXXX is not set.
- If a DTC is set Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- Verify the following conditions do not exist:
- Induction system leaks - Refer to Induction System Smoke Test in Charge Air Cooler Diagnosis (Induction System Smoke Test) , Charge Air Cooler Diagnosis (Induction System Air Leak Test) .
- Exhaust system leaks - Refer to Exhaust Leakage
- Physical damage.
- Soot plugged B195 NOx Sensor.
- Loose or missing hardware.
- Loose B195 NOx.
- If a condition is found Repair the intake or exhaust system.
- If no condition is found Replace the B195 NOx Sensor - Position 2.
- Nitrogen Oxide Sensor Replacement - Position 2
- Perform the scan tool NOx Sensor 2 Reset procedure after replacing the NOx sensor 2.
- Control Module References for engine control module replacement, programming and setup.
- Install any components or connectors that have been removed or replaced during diagnosis.
- Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
- Clear the DTCs.
- Ignition Off, all vehicle systems Off, this may take up to 2 minutes.
- Ignition On, perform the Reductant System Quality Test with a scan tool.
- Engine idling for at least 5 min.
- Ignition Off, all vehicle systems Off for 5 min.
- Ignition On, verify the DTC is not set.
- If the DTC is set A condition with the system still exists.
- All OK.