Circuit/System Verification

• If any of the DTCs are set 

  Refer to DTC P0641, P0651, P0697, or P06A3

• Go to next step: If none of the DTCs are set 

• If 90% or greater 

  Refer to Throttle Body Cleaning

• Go to next step: If less than 90% 

Verify the scan tool parameter: Throttle Position Sensor and Sensor 2 = Agree

• If not the specified state 

  Refer to DTC P0121-P0123, P0222, P0223, P2135, U0606, or U0607 

• Go to next step: If the specified state 

• Manifold Absolute Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
• Turbocharger/Supercharger Boost Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure

• If not in the specified range 

• {Manifold Absolute Pressure Sensor}. Refer to: Circuit/System Testing
• {Turbocharger/Supercharger Boost Pressure Sensor}. Refer to DTC P0236, P0237, or P0238 

• Go to next step: If in the specified range 

• Manifold Absolute Pressure Sensor = 26 to 52 kPa (3.8 to 7.5 PSI)
• Manifold Absolute Pressure Sensor = The value should change with accelerator pedal input.

• If not in the specified range or does not change 

  Refer to: Circuit/System Testing

• Go to next step: If in the specified range and changes 

Perform the action while monitoring the parameter:

• Wiggle the harness and connector: B65 Manifold Absolute Pressure and Intake Air Temperature Sensor
• Wiggle the harness and connector: K20 Engine Control Module

• If the value spikes or drops out 

  Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)

• Go to next step: If the value does not spike or drop out 

• If the value does not change 

  Refer to DTC P0236, P0237, or P0238 

• Go to next step: If the value changes 

Verify the scan tool parameter: Mass Air Flow Sensor = The value should not spike or drop out.

• If the value spikes or drops out 

  Refer to DTC P0102, P0103, U060F, or U1319 

• Go to next step: If the value does not spike or drop out 

• If the tool is not available 

  Refer to step 17

• Go to next step: If the tool is available 

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 

• B65 Manifold Absolute Pressure and Intake Air Temperature Sensor - Visible Damage
• B75 Mass Airflow Sensor - Contamination of the measuring element / Visible Damage/Water intrusion
• B111 Turbocharger/Supercharger Boost Pressure Sensor
  • Restricted - Moisture/Ice
  • Skewed
• Q38 Throttle Body
  • Coking/Loose Clamps /Visible Damage
  • Restricted - Moisture/Ice
• 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
NOTE:

It may be necessary to use a scan tool control function to operate a component.

• Linkage @ M128 Turbocharger Wastegate Actuator - Binding or Sticking/Loose/Visible Damage
• Q40 Turbocharger Bypass Valve Solenoid - Binding or Sticking/Loose/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 

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 

• B65 Manifold Absolute Pressure and Intake Air Temperature Sensor - Leaking @ O-Ring - Missing / Visible Damage
• B75 Mass Airflow Sensor - Contamination of the measuring element /Cracked/Loose Clamps / Visible Damage/Water intrusion
• B111 Turbocharger/Supercharger Boost Pressure Sensor
  • Leaking @ O-Ring - Missing / Visible Damage
  • Restricted - Moisture/Ice
  • Skewed
NOTE:

It may be necessary to use a scan tool control function to operate a component.

• M128 Turbocharger Wastegate Actuator - Linkage Binding or Sticking/Loose/Visible Damage
• Q40 Turbocharger Bypass Valve Solenoid - Binding or Sticking/Loose/Visible Damage
• Q38 Throttle Body
  • Coking/Loose Clamps /Visible Damage
  • Restricted - Moisture/Ice
• Air Cleaner Element - Dirty / Restricted
• Catalytic Converter - Blocked / Restricted/Visible Damage
• Charge Air Cooler
  • Leaking / Incorrect connection
  • Restricted - Moisture/Ice
• Engine - Mechanical Condition - Refer to Symptoms - Engine Mechanical
• Exhaust System - Leaking /Restricted/ Visible Damage - Refer to Symptoms - Engine Exhaust
• Intake Air Ductor Turbocharger Inlet Duct - Cracked/ Leaking/ Loose Clamps / Restricted / Visible Damage
• Intake Manifold - Cracked / Loose Clamps / Restricted / Vacuum leak/Visible Damage
• Positive Crankcase Ventilation System
  • Leaking @ O-Ring - Missing / Visible Damage
  • Restricted - Moisture/Ice
  • Incorrect connection /Leaking / Restricted
• Turbocharger - Mechanical damage/Visible Damage - Refer to Compressor Air Intake Turbocharger System Description
• Vacuum leak @ Engine - Oil Level Indicator and Tube /Oil Filler Cap

• If a condition exists 

  Repair or replace as necessary

• Go to next step: If no condition exists 

Verify the DTC does not set.

• If the DTC is set 

  Refer to: Circuit/System Testing

• Go to next step: If the DTC is not set