GM Service Manual Online
For 1990-2009 cars only

Crankcase Ventilation System Inspection VIN 1

Removal Procedure

  1. Remove the injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.

  2. Object Number: 12314  Size: MH
  3. While holding down the crankcase ventilation valve access cover (1), remove the 2 access cover retaining bolts.
  4. Remove the crankcase ventilation valve access cover (1).
  5. Remove the crankcase ventilation valve (2), spring, and O-ring (3).

Installation Procedure


    Object Number: 12314  Size: MH
  1. Install the crankcase ventilation valve, spring, and new O-ring.
  2. Reinstall the crankcase ventilation valve access cover.
  3. While holding down crankcase ventilation valve access cover, install the 2 access cover retaining bolts.
  4. Reinstall the injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.

Crankcase Ventilation System Inspection VIN K

Removal Procedure

  1. Remove the injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.

  2. Object Number: 12315  Size: MH
  3. Remove the MAP sensor (1).
  4. Use a 16 mm socket to press the access cover (2) down and rotate 1/4 turn counterclockwise.
  5. Remove the access cover.
  6. Remove the PCV valve (3) and the O-ring (4) from the intake manifold.

Installation Procedure


    Object Number: 12315  Size: MH
  1. Install the crankcase ventilation valve; replace the O-ring if necessary.
  2. Reinstall the access cover.
  3. Reinstall the MAP sensor.
  4. Reinstall the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement in engine mechanical