Crankshaft Angle Sensor CAS CKS Replacement

Car CAS Replacing Procedure

Helpful Information

A crankshaft positing sensor sends feedback data to the engine computer (PCM), when this sensor fails the engine will stall, which could be immediate or intermitted.

Easy steps on how to replace an automotive engine crankshaft angle sensor (CAS or CKS), this information outlines a typical sensor replacement though configurations may vary the process is the same.

Difficulty Scale: 4 of 10

Begin with the vehicle on level ground, safely hoisted and supported by jack stands, engine off (cold) with the emergency brake set.

Step 1 - Locate the crankshaft angle sensor, some are positioned behind components such as the starter which will need to be removed to replace the sensor.

Starter

Step 2 - Before removing the starter disconnect the negative battery cable to avoid electrical damage.

Removing Negative Battery Cable

Step 3 - After disconnecting the battery remove the starter mounting bolts, the starter will become loose.

Removing Starter Bolts

Step 4 - Once the bolts have been removed , support the starter motor while moving it off to the side and out of the way of the crankshaft angle sensor.

Move Starter Motor

Step 5 - By removing the starter motor the sensor can be more easily accessible.

Crankshaft Angle Sensor

Step 6 - Release the connector clip to remove the wiring harness from the sensor.

Release Electrical Connector

Step 7 - Next, locate the sensor mounting bolt and remove it.

Crankshaft Angle Sensor Mounting Bolt

Step 8 - Once the bolt has been removed, use a small pry tool or screw driver to work the sensor loose.

Removing Sensor

Step 9 - After the sensor has been worked loose, firmly grasp the sensor and pull it from the engine block, a small amount of oil may be present.

Failed Crankshaft Position Sensor

Step 10 - Compare the new sensor to the failed sensor to ensure a proper installation.

New Crankshaft Position Sensor

Step 11 - Before installing the new sensor, clean the sensor port to ensure a proper seal to the new sensor.

Sensor Port

Step 12 - Once the port has been cleaned, install the new sensor with a small amount of oil to lubricate the "O" ring seal.

Install New Crankshaft Angle Sensor

Step 13 - After the sensor has been installed, thread the mounting bolt into place and tighten (do not over tighten.)

Install Sensor Bolt

Step 14 - Next, reconnected the electrical connector to the sensor. (Note: Ensure the connector is clean prior to insertion.)

Reinstall Electrical Connector

Step 15 - Once the sensor installation is complete reposition the starter and insert the mounting bolts.

Reposition Starter

Step 16 - Tighten starter bolts evenly and recheck previous work to ensure the job was performed correctly.

Tighten Starter Bolts

Step 17 - Reconnect negative battery cable at the completion of the job, if hard sparking is occurring, remove the starter and check for wiring problems.