Crankshaft Position (CKP) Sensor

Crankshaft Position (CKP) Sensor
This system uses a magnetic CKP sensor (2), mounted remotely from the ICM (3). This CKP sensor protrudes into the block within approximately 0.050 inches from the crankshaft reluctor. The graphic illustrates a typical sensor in relationship to the crankshaft reluctor. The reluctor is a special wheel which is cast into the crankshaft with 7 slots machined into the wheel, 6 of which are equally spaced (60 degrees apart). A seventh slot is spaced 10 degrees from one of the other slots and serves to generate sync-pulses. As the reluctor rotates as part of the crankshaft, the slots change the magnetic field of the sensor, creating induced voltage pulses. Based on the CKP sensor pulses, the CKP sensor sends a 7x reference signal to the PCM, which is used to indicate the crankshaft position and the engine speed. The CKP sensor continues to send these reference pulses to the PCM at a rate of seven times per 360 degrees of crankshaft revolution. This signal is called the 7x reference because the signal occurs 7 times per crankshaft revolution. The 7x reference signal is necessary in order for the PCM to determine when to energize the fuel injectors.