Crankshaft Position Sensor: Description and Operation

Camshaft Position (CMP) A and B (Top Dead Center (TDC) 1 and 2), and Crankshaft Position (CKP) Sensors
The CMPA (TDC 1) and CMPB (TDC 2) sensors detect the position of the No.1 cylinder as a reference for sequential fuel injection to each cylinder. The CKP sensor detects engine speed and determines ignition timing and timing for fuel injection of each cylinder.