Circuit/System Verification

• If the DTC is set 

  Refer to: DTC P0641, P0651, P0697, or P06A3 

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

• Crankcase Ventilation Hose Connection Pressure Sensor = -6 to 6 kPa (-0.8 to 0.8 PSI)
NOTE:

Using the scan tool line graph function may make it easier to identify if the value changes.

• Crankcase Ventilation Hose Connection Pressure Sensor = The value should change with accelerator pedal input.

• If not between -6 and 6 kPa (-0.8 and 0.8 PSI) or does not change 

  Refer to: Circuit/System Testing

• Go to next step: If between -6 and 6 kPa (-0.8 and 0.8 PSI) and changes 

Perform the action while monitoring the parameter:

• Wiggle the harness and connector: B321 Crankcase Pressure 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 

• B65 Intake Manifold Pressure and Air Temperature Sensor - Leaking @ O-Ring - Missing/Visible Damage
• B321 Crankcase Pressure Sensor - Leaking @ O-Ring - Missing/Visible Damage
• Air Cleaner Element - Dirty/Missing/Restricted
• Intake Air Duct & Intake Manifold - Cracked/Loose Clamps/Restricted/Visible Damage
• Oil consumption
  • Piston Ring - Worn
  • Valve Guide - Worn
  • Valve Stem Oil Seal - Leaking

    Refer to: Oil Consumption Diagnosis

• Positive Crankcase Ventilation System - Hoses/Lines
  • Leaking - Loose Clamps/Visible Damage
  • Restricted - Collapsed/Kinked

• 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 sets 

  Repeat steps 4 and 6

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