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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 >> DTC P2598 or P2599: Turbocharger Boost Control >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition On.
  2. Verify DTC DTC P0045, P0047, P0048, P2263, P2564 or P2565 is not set.
    • If none of the DTCs are set. 
  3. Ignition OFF, verify the conditions listed below do not exist:
    • Leaking, damaged, kinked, restricted or incorrectly routed vacuum lines.
      NOTE: All vacuum lines, including those routed to the EGR cooler bypass valve, brake booster and turbocharger vane position actuator, must be carefully inspected.
    • Damaged Q41 Turbocharger Vane Position Control Solenoid Valve.
    • Damaged turbocharger vane position control actuator.
    • Damaged Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
    • Damaged EGR cooler bypass actuator.
    • Damaged or incorrect installation of power brake booster.
    • Damaged or leaking EGR cooler vacuum tank.
    • If a condition exists 

      Test or replace the component as necessary.

    • If none of the conditions exist 
  4. Disconnect the vacuum hose between the vacuum pump and the EGR cooler vacuum tank at the vacuum pump and cap the hose barb.
  5. Disconnect the power brake booster vacuum pipe from the vacuum pump and connect the GE 23738-A  or a suitable vacuum gauge, to the outlet on the vacuum pump.
  6. Engine idling, verify the vacuum is 90 kPa (26.6 in. Hg.) or greater.
    • If less than 90 kPa (26.6 in. Hg.) 

      Replace the vacuum pump.

    • If 90 kPa (26.6 in. Hg.) or greater 
  7. Ignition Off, reconnect the vacuum supply hoses to the vacuum pump.
  8. Connect the GE 23738-A  or a suitable vacuum gauge, to the center port on the top of the EGR cooler vacuum tank.
  9. Disconnect the remaining vacuum hoses from the top of the EGR cooler vacuum tank and cap the open ports.
  10. Engine idling, verify the vacuum is 90 kPa (26.6 in. Hg.) or greater.
    • If less than 90 kPa (26.6 in. Hg.) 

      Replace the Exhaust Gas Recirculation Valve Vacuum Tank.

    • If 90 kPa (26.6 in. Hg.) or greater 
  11. Reconnect the vacuum hose from the Q41 Turbocharger Vane Position Control Solenoid Valve to the port on the top of the EGR cooler vacuum tank.
    NOTE: Leave the vacuum tank port for the EGR cooler bypass system capped until further instructions.
  12. Engine idling, verify the vacuum dips less than 20 kPa (5.9 in. Hg.) and recovers when commanding the Turbocharger Vane Position Solenoid Valve On and Off multiple times with a scan tool.
    NOTE:
    • The engine must be at normal operating temperature before proceeding with the next step.
    • It may take up to 10 On-Off cycles to verify that the solenoid operates consistently.
    • If 20 kPa (5.9 in. Hg.) or greater or does not recover 
    1. Ignition Off, disconnect the vacuum outlet hose from the Q41 Turbocharger Vane Position Control Solenoid Valve and connect the GE 23738-A  to the outlet port on the valve.
    2. Engine idling, verify the vacuum changes from 0 kPa (0 in. Hg.) to 80 kPa (23.6 in. Hg.) or greater while disconnecting and reconnecting the Q41 Turbocharger Vane Position Control Solenoid Valve harness connector.
      • If less than 80 kPa (23.6 in. Hg.)

        Replace the Q41 Turbocharger Vane Position Control Solenoid Valve.

      • If 80 kPa (23.6 in. Hg.) or greater
    3. Reconnect the vacuum hose at the Q41 Turbocharger Vane Position Control Solenoid Valve.
    4. Verify the turbocharger vane position actuator rod extends and retracts when disconnecting and reconnecting the Q41 Turbocharger Vane Position Control Solenoid Valve harness connector.
    • If the rod does not extend or retract

      Replace the turbocharger.

    • If the rod extends and retracts
    • If less than 20 kPa (5.9 in. Hg.) and recovers 
  13. Reconnect the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve vacuum hose to the port on the top of the EGR cooler vacuum tank.
  14. Engine idling, verify the vacuum dips less than 20 kPa (5.9 in. Hg.) and recovers while commanding the EGR Cooler Bypass Solenoid Valve On and Off multiple times with a scan tool.
    NOTE:
    • The engine must be at normal operating temperature before proceeding with the next step.
    • It may take up to 10 On-Off cycles to verify that the solenoid operates consistently.
    • If 20 kPa (5.9 in. Hg.) or greater or does not recover 
    1. Ignition Off, 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.
    2. Engine idling, verify the vacuum changes from 0 kPa (0 in. Hg.) to 80 kPa (23.6 in. Hg.) or greater while commanding the EGR Cooler Bypass Solenoid Valve On and Off with a scan tool.
      • If less than 80 kPa (23.6 in. Hg.)

        Replace the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve

      • If 80 kPa (23.6 in. Hg.) or greater
    3. Reconnect the vacuum hose at the Q47 Exhaust Gas Recirculation Cooler Bypass Solenoid Valve.
    4. Verify the EGR cooler bypass actuator rod extends and retracts while commanding the EGR Cooler Bypass Solenoid Valve On and Off with a scan tool.
    • If the rod does not extend or retract

      Replace the EGR cooler valve actuator.

    • If the rod extends and retracts
    • If less than 20 kPa (5.9 in. Hg.) and recovers 
  15. All OK
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