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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P205B - P2BAA) And Symptoms) >> Diagnostic Information And Procedures >> DTC P20E8 Or P20E9: Reductant Low/High Pressure >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

The reductant temperature must be greater than -7°C (+19°F) before proceeding.

  1. Test the reductant for contamination. Refer to Contaminants-in-Fuel Diagnosis .
    • If contaminated 

      Repair as necessary

    • Go to next step: If not contaminated 
  2. Ignition - On/Vehicle - In Service Mode
  3. Command the Reductant System Leak Test On with a scan tool. Allow the pressure to build for 2 minutes. Observe the scan tool Reductant Pressure sensor parameter.
  4. Verify the scan tool parameter: Reductant Pressure Sensor = 400 to 650 kPa (58 to 94 PSI)
    • If greater than 650 kPa (94 PSI) 

      Replace the component: A38 Reductant Pump and Sensor Assembly

    • If less than 400 kPa (58 PSI) 
    1. Verify there are no leaks in the reductant lines.
      • If a leak is found

        Repair as necessary

      • If no leak is found
    2. Remove the Q61 Emission Reduction Fluid Injector from the exhaust pipe leaving the reductant line and electrical connector connected. Place the injector into a suitable container.
    3. Command the Reductant System Leak Test On with a scan tool. Allow the pressure to build.
    4. Verify the injector does not leak.
      • If a leak is found

        Replace the Q61 Emission Reduction Fluid Injector

      • If no leak is found
    5. Replace the component: A38 Reductant Pump and Sensor Assembly
    • Go to next step: If between 400 and 650 kPa (58 and 94 PSI) 
  5. All OK.
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