The sensor provides the management system with the information it needs to control ignition timing, and it lets the computer know when it needs to provide sparks and fuel. Without a functioning crankshaft position sensor, the computerized management system doesn't receive this critical information, and the vehicle will either not start, or 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. Your crank sensor runs off of what is called reference voltage. This means the PCM puts 5 volts to the sensor on the reference wire and then has what is called Low Reference. This is basically the ground that the PCM controls as well. Then the third wire is called the signal wire. Depending on this voltage the PCM knows the engine position. In a two crankshaft position sensor engine, the one that's located behind the crankshaft pulley is known as the 24X CKP sensor and the other is called the same (3X or 7X CKP sensor). Since the 7X (3X) CKP sensor is the one directly responsible for starting the car, this tutorial will show you how to test only this one. You don't have to worry Turn off the ignition, then reconnect the CKP sensor to the harness connector. Set your multimeter to read millivolts through a low DC voltage preset. Connect your multimeter's black lead to the battery's negative terminal. Use the red lead to back probe the black, ground wire at the CKP sensor or harness connector. 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. A magnetoresistive sensor is a device that uses a magnetic field to transform mechanical motion into an electrical signal. It requires a power source to operate. This type of sensor is found in CMP, CKP, ABS,and steering wheel speed sensors due to its increased accuracy and resistance to electromagnetic interference (EMI). Disconnect the negative battery terminal. 2. Locate the sensor in question. The location will vary by engine and sensor type. Many are located on the front of the engine, while others may be on the side or rear. 3. Remove any engine parts that may be blocking access, like plastic engine covers or the air intake tube. During tests we have found that Suzuki DF 40/50 Four Stroke series engines, the engine control unit sometimes stores a CKP Crankshaft Position Sensor error, and that the engine (Fig 1) does not run correctly in this condition. After checking that the sensor was working correctly (resistance of 168-252 ohms and 20°) and the viability of the Meanwhile, some symptoms of a bad crankshaft sensor include: 01. Check the Engine light display. The Check Engine light is undoubtedly triggered by several malfunctions that may occur not only within the crankshaft sensor. However, it is one of the foremost noticeable symptoms of a defective crank sensor. lodkF.