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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0234 or P0299 >> Circuit/System Testing

Circuit/System Testing

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

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

  1. Ignition/Vehicle - Off
  2. 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 
  3. Verify the following conditions do not exist:
    • B65 Intake Manifold Pressure and Air Temperature Sensor - Visible Damage
    • B75C Multifunction Intake Air Sensor - Contamination of the measuring element/Visible Damage/Water intrusion
    • B111 Turbocharger Boost Sensor
      • Restricted - Moisture/Ice
      • Skewed
    • Q38 Throttle Body
      • Coking/Loose Clamps/Visible Damage
      • Restricted - Moisture/Ice
    • Q40 Turbocharger Bypass Valve Solenoid - Binding or Sticking/Loose/Visible Damage
    • Q42 Turbocharger Wastegate Solenoid Valve - Linkage Binding or Sticking/Loose/Visible Damage
    • Air Cleaner Element - Dirty/Restricted
    • Catalytic Converter & Exhaust System - Blocked/Leaking/Restricted/Visible Damage - Refer to Symptoms - Engine Exhaust
    • Charge Air Cooler - Restricted - Moisture/Ice
    • Intake Air Duct - Collapsed/Restricted/Visible Damage
    • Intake Manifold - Restricted/Visible Damage
    • Positive Crankcase Ventilation System - Restricted - Moisture/Ice
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  4. Verify the following conditions do not exist: Engine - Mechanical Condition
      NOTE:

      The list is not all encompassing - Refer to Symptoms - Engine Mechanical

    • Compressor Air Intake Turbocharger or Turbine Shaft Seal - Leaking - Engine Oil
    • Compressor Air Intake Turbocharger - Low oil pressure
    • Compressor Air Intake Turbocharger - Mechanical Condition/Worn
    • Camshaft Lobe(s) - Visible Damage/Worn
    • Exhaust Valve or Intake Valve - Stuck Open/Visible Damage
    • Exhaust Valve Seat or Intake Valve Seat - Visible Damage
    • Piston - Cracked/Visible Damage
    • Piston Ring - Seized/Visible Damage/Worn
    • 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 Pump Assembly
  6. Install - EN-23738-A Vacuum Pump @ Vacuum Hose - Hose/line going to the component: Vacuum Pump Assembly
  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
      • If a condition exists - Repair or replace as necessary
      • Go to next step: If no condition exists
    3. Test or replace the component: Vacuum Pump Assembly
    • 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 Pump Assembly
  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
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