GM 90541521 Sensor,Knock

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For four-cylinder models, ensure the ignition key is turned to OFF, raise the front of the vehicle securely on jackstands, and remove the starter motor. Disconnect the knock sensor electrical connector, remove the knock sensor retaining bolt, and then remove the knock sensor. Installation is the reverse of removal, ensuring the retaining bolt is tightened to the specified torque. For V6 models, start by turning the ignition key to OFF and disconnecting the negative battery terminal cable. Disconnect the knock sensor No. 1 electrical connector, remove the accessory drivebelt and tensioner pulley, and the upper alternator mounting bolt. Raise the front of the vehicle on jackstands, remove the right front splash shield, and the accessory drivebelt tensioner. Disconnect the alternator electrical connectors and remove the lower mounting bolt, moving the alternator aside for access to the knock sensor. Note the routing of the knock sensor No. 1 wire harness, detach it from routing clips, remove the retaining bolt, and then the knock sensor. Installation is the reverse, ensuring the retaining bolt is tightened to the specified torque before reconnecting the negative battery terminal cable. For knock sensor No. 2, turn the steering wheel to the right, turn the ignition key to OFF, and disconnect the negative battery terminal cable. Disconnect the electrical connector and detach the lead from the CMP sensor clip, disengaging it from the attachment clip further down the wire. Tie a string or wire to the knock sensor No. 2 connector and a fixed component near the CMP sensor, loosen the power steering pump pulley bolts, and remove the accessory drivebelt. Remove the power steering pump pulley bolts and pulley, then raise the vehicle securely on jackstands. Remove the retaining bolt for knock sensor No. 2, guiding it out with the string or wire. Disconnect the knock sensor from the string or wire without removing the string or wire from the engine. Tie the new knock sensor to the string or wire and guide it back into place, completing installation in reverse order and ensuring the retaining bolt is tightened to the specified torque.

Disconnect the cable from the negative battery terminal.