GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Engine 🢒 Engine Controls - 3.0L 🢒 Mass Airflow Sensor with Intake Air Temperature Sensor Replacement

Removal Procedure

    Object Number: 477802 Size: SH
  1. Disconnect the wiring harness from the mass air flow / intake air temperature (MAF/IAT) sensor (3).
  2. Loosen the hose clamp at the bottom and top of the MAF/IAT sensor.

    3. Important: Do not disassemble the MAF sensor. Remove and install as a complete unit only. If there is external deformation (e.g. deformation of grid), replace the MAF sensor.

  3. Remove the MAF/IAT sensor from the intake duct. Note the installation position.

Installation Procedure

    Object Number: 21412 Size: SH
  1. Install the MAF/IAT sensor (1) into the lower air intake duct.

    2. An arrow on the MAF/IAT sensor shows the proper flow direction.

  2. Install the air intake duct onto the MAF/IAT sensor to the air cleaning housing.

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    Important: Ensure that all of the hose connections are in good condition and are correctly seated.

  3. Install all of the hose clamps to the air intake ducts.

    4. Tighten
    Tighten the hose clamps to 8 N·m (71 lb in).

  4. Connect the wiring harness to the MAF/IAT assembly sensor.