P2216

DTC P2216 NOx Sensor Out Of Range High Sensor 2

Description

The NOx sensor 1 is installed to the rear chamber of diesel particulate filter (DPF) housing and it measures the concentration of NOx in the exhaust gas from the engine at the upstream of SCR catalyst. The NOx sensor 2 is installed to the rear chamber of SCR catalyst housing and it measures the concentration of NOx in the exhaust gas after NOx conversion at the downstream of SCR catalyst. Each sensor element has a heater to maintain its active status. The measurement of NOx concentration in the exhaust gas is started after each NOx sensor status is valid, and the DEF control module switches to the DEF injection control based on actual measurement values of the NOx sensors. The DEF control module uses the modeled NOx concentration calculated from the current engine running conditions before each NOx sensor status is valid. The DEF control module receives NOx sensor information from the each NOx sensor control module via the controller area network (CAN) communication bus. If the DEF control module detects an excessively high NOx concentration condition from the sensor 2 for a certain length of time, this DTC will set.

Condition for Running the DTC

- DTC U029E is not set.
- The battery voltage is between 11 to 16 volts.
- The ignition switch is ON.
- The engine is running.
- The NOx sensor 2 status is valid.

Condition for Setting the DTC

- The DEF Control Module detects an excessively high NOx concentration from the NOx sensor 2 longer than 5 seconds.

Action Taken When the DTC Sets

- The DEF control module requests the ECM to illuminate the MIL. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type A.
- The DEF control module and the ECM apply defaulted warning actions. Refer to Default Action and Fail- Safe List.

Conditions for Clearing the DTC

- Refer to DTC Type Definitions for Conditions for Clearing the DTC - Type A or Type B.

Diagnostic Aids

- If an intermittent condition is suspected, refer to Intermittent Conditions in this section.

Circuit / System Testing DTC P2216