GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2003 🢒 CTS - RHD 🢒 Engine 🢒 Engine Controls - 2.6L and 3.2L 🢒 Knock Sensor 1 Replacement

Removal Procedure

    Object Number: 785857 Size: SH
  1. Disconnect the knock sensor pigtail (1) from the electrical connector (2) and bracket.
  2. Remove the generator. 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. 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 (1).
  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. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 21520 Size: SH

    Important: DO NOT use washers, spring washers, or toothed washers when installing the knock sensor. Tighten the bolt to the proper torque.

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

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

    Important: The knock sensor pigtail is guided past the rear timing belt cover by several retaining clips. 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. Refer to Generator Replacement in Engine Electrical.

    5. Object Number: 785857 Size: SH
  5. Connect the knock sensor pigtail (1) to the electrical connector (2) and bracket.