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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Controls And Fuel - 3.6L (LF4) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P0234, P0299, or P16E7 >> Circuit/System Testing

Circuit/System Testing

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NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Ignition/Vehicle - Off
  2. Verify the tool is available: GE-52250  Variable Pressure Leak Detector
    • If the tool is not available 

      Refer to step 4

    • Go to next step: If the tool is available 
  3. Perform the following procedure/test: Component/System Leak Test

    Verify the procedure/test passes.

    • If the procedure/test does not pass 

      Repair or replace as necessary

    • Go to next step: If the procedure/test passes 
  4. Verify the following conditions do not exist:
    • Air Cleaner Element - Dirty / Restricted
    • Intake Air Duct - Cracked / Leaking /Loose Clamps / Restricted / Visible Damage
    • Linkage @ Turbocharger Wastegate Actuator - Binding or Sticking/Loose/Visible Damage/Worn
    • Vacuum Hoses - Kinked / Incorrect connection /Leaking / Restricted
    • Vacuum leak @ Engine - Oil Level Indicator and Tube /Oil Filler Cap
    • Positive Crankcase Ventilation System
      • Incorrect connection /Leaking / Restricted
      • Leaking @ O-Ring - Missing / Visible Damage
      • Restricted - Moisture/Ice
    • B74 Manifold Absolute Pressure Sensor - Leaking @ O-Ring - Missing / Visible Damage
    • B75 Mass Air Flow Sensor - Contamination of the measuring element /Cracked/Loose Clamps / Visible Damage/Water intrusion
    • B111B Turbocharger/Supercharger Boost Pressure and Intake Air Temperature Sensor
      • Leaking @ O-Ring - Missing / Visible Damage
      • Restricted - Moisture/Ice
      • Skewed
    • Q38 Throttle Body
      • Coking/Loose Clamps /Visible Damage
      • Restricted - Moisture/Ice
    • Catalytic Converter & Exhaust System - Blocked / Leaking /Restricted/Visible Damage - Refer to: Symptoms - Engine Exhaust
    • Charge Air Cooler
      • Incorrect connection / Leaking
      • Restricted - Moisture/Ice
    • Engine - Mechanical Condition - Refer to: Symptoms - Engine Mechanical
    • Intake Manifold - Cracked / Loose Clamps / Restricted / Vacuum leak/Visible Damage
    • Turbocharger - Mechanical Condition
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  5. Disconnect the component: Vacuum Hose @ Q42 Turbocharger Wastegate Solenoid Valve - Hose/line going to the component: Vacuum reservoir
  6. Install - EN-23738-A  Vacuum Pump @ Vacuum Hose - Hose/line going to the component: Vacuum reservoir
  7. Engine - Idling
  8. Verify the tool reading: EN-23738-A  Vacuum Pump =-50 kPa (-0.5 bar, 15 in Hg) can be achieved and holds steady
    • If the desired pressure/vacuum cannot be achieved or does not hold steady 
    1. Ignition/Vehicle - Off
    2. Verify a condition does not exist with the component: Vacuum Hoses - Incorrect connection /Kinked/Leaking /Restricted/Visible Damage
      • Vacuum Hoses - Incorrect connection /Kinked/Leaking /Restricted/Visible Damage
      • Vacuum reservoir - Cracked/Restricted/Leaking/Visible Damage
      • If a condition exists - Repair or replace as necessary
      • Go to next step: If no condition exists
    3. Test or replace the component: Vacuum reservoir
    • Go to next step: If the desired pressure/vacuum can be achieved and holds steady 
  9. Engine - Off
  10. Connect the component: Vacuum Hose @ Q42 Turbocharger Wastegate Solenoid Valve - Hose/line going to the component: Vacuum reservoir
  11. Disconnect the component: Vacuum Hose @ Turbocharger Wastegate Actuator - Hose/line going to the component: Q42 Turbocharger Wastegate Solenoid Valve
  12. Install - EN-23738-A  Vacuum Pump @ Hose/line going to the component: Q42 Turbocharger Wastegate Solenoid Valve
  13. Engine - Idling
  14. Verify the tool reading: EN-23738-A  Vacuum Pump = Less than -17 kPa (-0.17 bar, 5 in Hg)
    • If -17 kPa (-0.17 bar, 5 in Hg) or greater 

      Test or replace the component: Q42 Turbocharger Wastegate Solenoid Valve

    • Go to next step: If less than -17 kPa (-0.17 bar, 5 in Hg) 
  15. Engine Speed @ Wide Open Throttle - For 2 s

    Verify the tool reading: EN-23738-A  Vacuum Pump = Greater than -50 kPa (-0.5 bar, 15 in Hg)

    • If -50 kPa (-0.5 bar, 15 in Hg) or less 
    1. Ignition/Vehicle - Off
    2. Verify a condition does not exist with the component: Vacuum Hoses - Incorrect connection /Leaking /Visible Damage
      • If a condition exists - Repair or replace as necessary
      • Go to next step: If no condition exists
    3. Test or replace the component: Q42 Turbocharger Wastegate Solenoid Valve
    • Go to next step: If greater than -50 kPa (-0.5 bar, 15 in Hg) 
  16. Test or replace the component: Turbocharger Wastegate Actuator
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