A CKP sensor provides an Engine Control Module (ECM) with its primary engine timing reference signal. The ECM uses it to calculate the engine speed and position for accurate injection and ignition control. Apply the parking brake and block wheels. Ensure the hood is closed. 2. Place the transmission in park for automatics and neutral for manual transmissions. 3. Start the engine and bring it up to operating temperature. 4. Apply the hydraulic brakes. Select and Enable Crankshaft Variation Relearn Procedure using a scan tool. 4. Swing the sensor over the trans and to the passenger side. Go up to the engine compartment and find the connector. (Its behind the oil filter) You will see it. The connector is held in with a plastic locking stud. A flat head screwdriver will pry it off. Disconnect the connector and pull out the sensor. 5. The crankshaft position sensor (CKP) is an important component of the Electronic Injection System since it measures the rotation of the shaft where it is installed and informs the Control Unit (ECU). If the Sensor has problems the vehicle will not work. And what is the function of the CKP sensor? First off, the vehicle is a 2005 6.0, 173,xxx miles, all stock. Came in on the hook for a no start condition. Verified that. Batteries are good. Hooked up IDS, scanned for codes. P0335-crankshaft sensor circuit a. That is it on the codes. The crankshaft sensor is an important electrical device to detect engine RPM and ignition timing. The 3-wire crank sensor comes with a 5V or 12V reference, signal, and ground terminals. These three terminals connect to the vehicle's ECU. "Note: Depending on the model of the vehicle, the crank sensor's wiring diagram might vary." Start the engine of your car. Make sure that the engine oil and coolant levels are optimal; the latter being at 158F. Now, shut down the engine for 10 seconds. Select CASE Learn on your scanner. This is going to prepare the crankshaft position sensor for the learning procedure. The transmission should be in Park. The ECM uses signal pulses from the crank position sensor (CKP) to calculate when a particular cylinder is approaching top dead center. The pulses from the cam position sensor (CMP) are used to decide whether it is on a compression or an exhaust stroke. When either signal is lost, the ECM may shut down ignition, injection or both. kZJ6djd.