Jeep 5149188AA Sensor-Knock

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To remove the camshaft reference sensor on 3.3L and 3.8L models, detach the sensor lead, loosen the bolt, and remove the sensor. If reusing, clean the sensor face and replace the spacer and O-ring. To install a new sensor, ensure it has a paper spacer and mount the O-ring. For the charge temperature sensor, unplug the connector, replace the sensor, and secure it with tape. For the coolant sensor, replace the cap, and the sensor, and check the coolant level. For the crankshaft sensor, unplug the connector, loosen the bolt, remove the sensor, and replace the spacer if reusing. For the TPS, check resistance readings, and replace if it is incorrect.

The knock sensors are located in the valley between the cylinder heads.

The sensor nearest the front of the engine is Sensor no. 1 and the sensor nearest the rear of the engine is Sensor no.2.

Over or under-tightening can impact sensor performance and the PCM's spark control ability.

To replace the knock sensors, start by disconnecting the cable from the negative battery terminal. Then, disconnect the knock sensor electrical connector, which is located at the rear of the engine, behind the intake manifold. If you can't find the connector, wait until you have removed the intake manifold and locate the two knock sensors and trace their leads back to the common connector. Remove the intake manifold and then remove the knock sensor assembly by removing the mounting bolts. Make sure to clean the holes for the mounting bolts before installing the new knock sensor assembly. For 3.7L V6 engines, note that the left knock sensor is identified by an identification tag and has a larger mounting bolt. Do not install the left knock sensor in the right sensor mounting position and vice versa, as it will confuse the PCM and cause a Diagnostic Trouble Code. Installation is the reverse of removal, making sure to tighten the knock sensor mounting bolts to the common connector. Remove the intake manifold and then remove the knock sensor assembly by removing the mounting bolts. Make sure to clean the holes for the mounting bolts before installing the new knock sensor assembly. For 3.7L V6 engines, note that the left knock sensor is identified by an identification tag and has a larger mounting bolt. Do not install the left knock sensor in the right sensor mounting position and vice versa, as it will confuse the PCM and cause a Diagnostic Trouble Code. Installation is the reverse of removal, making sure to tighten the knock sensor mounting bolts to the correct torque.