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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P2122 To DTC P2689 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Reductant Fluid Quality Test >> Circuit/System Description

Circuit/System Description

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A Reductant Fluid Quality Test is required when an incorrect reductant composition is monitored or the NOx catalyst efficiency reaches a minimum threshold and a reductant quality warning is displayed on the driver information center (DIC). When a reductant quality test is commanded, the engine control module (ECM) controls the following:

  1. Engine speed is slowly increased to 3, 000 RPM.
  2. The ECM maintains engine speed at 3, 000 RPM for up to 60 minutes until quality test is complete, is cancelled by the technician or is aborted due to abnormal conditions.
  3. The ECM then slowly decreases engine speed to the normal idle speed.
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