LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P24A5 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition On.
  2. Verify DTC P0071, P0072, P0073, P0074, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P011E, P0128, P245A, P245C, or P245D is not set.
    • Go to next step : If none of the DTCs are set 
  3. Ignition OFF, verify the conditions listed below do not exist :
      NOTE:

      All vacuum lines, including those routed to the EGR cooler bypass valve and brake booster must be carefully inspected.

    • Leaking, damaged, kinked, restricted or incorrectly routed vacuum lines.
    • Damaged Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
    • Damaged EGR cooler bypass actuator.
    • Damaged or incorrect installation of power brake booster.
    • If a condition exists 

      Repair or replace as necessary.

    • Go to next step : If none of the conditions exist 
  4. Disconnect the vacuum supply hose at the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve and connect the GE 23738 - A  , or a suitable vacuum gauge, to the hose.
  5. Engine idling, verify the vacuum is 50 kPa (14.8 in. Hg.) or greater.
    • If less than 50 kPa (14.8 in. Hg.) 

      Check the vacuum pump for proper operation and the vacuum reservoir for leaks.

    • Go to next step : If 50 kPa (14.8 in. Hg.) or greater 
  6. Ignition Off, reconnect the vacuum supply hose to the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
  7. Disconnect the vacuum outlet hose from the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve and connect the GE 23738 - A  to the outlet port on the valve.
  8. Engine idling, verify the vacuum changes from 0 kPa (0 in. Hg.) to 40 kPa (11.8 in. Hg.) or greater while commanding the EGR Cooler Bypass Solenoid Valve On and Off with a scan tool.
    • If less than 40 kPa (11.8 in. Hg.)

      Replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve

    • Go to next step : If 40 kPa (11.8 in. Hg.) or greater
  9. Reconnect the vacuum hose at the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
  10. Verify the EGR cooler bypass actuator linkage extends and retracts while commanding the EGR Cooler Bypass Solenoid Valve On and Off with a scan tool.
    • If the linkage does not extend or retract 
    1. Disconnect the EGR cooler bypass valve actuator linkage from the EGR manifold.
    2. Verify the linkage extends and retracts while commanding the EGR Cooler Bypass Solenoid Valve On and Off with a scan tool.
      • If the linkage does not extend or retract, replace the EGR cooler bypass valve actuator.
      • If the linkage extends and retracts, repair or replace the EGR manifold as necessary.
    • Go to next step : If the linkage extends and retracts 
  11. Clean or replace the EGR cooler.
scientia non olet · About LEMON Manuals