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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 P245A-P245D: Exhaust Gas Recirculation (EGR) Cooler Bypass Solenoid Valve >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Disconnect the vacuum source from the EGR Cooler Bypass valve.
  2. Connect the EN-23738-A  Mityvac to the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve vacuum supply hose.
  3. Engine running, verify the vacuum is greater than -50 kPa (-7.25 PSI).
    • If less than -50 kPa (-7.25 PSI) 
    1. Ignition OFF.
    2. Inspect the vacuum supply hose and filter for a leak or restriction
      • If the vacuum supply hose and filter are damaged, repair as necessary.
      • If the vacuum supply hose and filter are not damaged, replace the vacuum pump.
    • Go to next step: If greater than -50 kPa (-7.25 PSI) 
  4. Connect the vacuum source to the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve. Engine running, command the EGR Cooler Bypass valve OFF with a scan tool.
  5. Connect the EN-23738-A  Mityvac to the EGR Cooler Bypass valve vacuum port on the EGR Cooler Bypass valve.
  6. Verify the vacuum is at 0 kPa (0 PSI).
    • If greater than 0 kPa (0 PSI) 

      Replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.

    • Go to next step: If 0 kPa (0 PSI) 
  7. Command the EGR Cooler Bypass valve ON with a scan tool.
  8. Verify the vacuum is greater than -50 kPa (-7.25 PSI).
    • If less than -50 kPa (-7.25 PSI) 

      Refer to Circuit/System Testing.

    • Go to next step: If greater than -50 kPa (-7.25 PSI) 
  9. All OK.
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