GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 Engine 🢒 Engine Controls - 3.0L (L81) 🢒 Knock Sensor 1 Replacement

Removal Procedure
  1. Disconnect the knock sensor from the wiring harness.
  2. Remove the generator and the drive belt tensioner. Refer to Generator Replacement in Engine Electrical.

    3. Important: The knock sensor pigtail is guided past the rear timing belt cover by several retaining clips. Only one retainer clip is shown. Note the positioning of the knock sensor pigtail.

  3. Remove the knock sensor pigtail from the retaining clips on the rear timing belt cover.

    4. Object Number: 21520 Size: SH
  4. Remove the bolt in the center of the knock sensor.
  5. Remove the knock sensor (1) from the engine block.

Installation Procedure
  1. Thoroughly clean the mating surfaces of the knock sensor and the engine block. The entire contact surface of the knock sensor must lie directly on the engine block.

    2. Object Number: 21520 Size: SH

    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: DO NOT use washers, spring washers, or toothed washers when installing the knock sensor. Tighten all of the fasteners to the proper torque.

  2. Install the knock sensor (1) on to the engine block.

    3. Tighten
    Tighten the sensor to 20 N·m (15 lb ft).

    Important: The knock sensor pigtail is guided past the rear timing belt cover by several retaining clips. Only one retainer clip is shown. Install the knock sensor pigtail as noted during removal.

  3. Install the knock sensor pigtail into the retaining clips. Ensure that the pigtail does not contact any moving parts.
  4. Install the generator and the drive belt tensioner. Refer to Generator Replacement in Engine Electrical.
  5. Connect the knock sensor connector.