1A-10 Engine Control System Pump CMP (Cam Position) Sensor (Engine Rotation Sensor ) = NE Sensor CKP (Crank Position) Sensor CKP sensor to detect the crank position is installed to the flywheel housing. The sensor detects the rotating angle of the crankshaft in non-contact condition with the pointer installed to the flywheel and sends pulse signal to ECM. ECM calculates the injection timing at the pump cam position based on this pulse signal. The pump CMP sensor is positioned on the outer surface of the cam ring of the pump chamber.
The pulser installed to the injection pump drive shaft interrupts the magnetic flux generated by the permanent magnet and iron core of the sensor according to the shaft rotation to generate AC wave signal to the coil. This is transmitted to ECM (engine control module) and converted to square wave signal. engine speed and cam position are calculated by this signal. Calculation of engine speed: No. of pulses per hour is counted. Calculation of cam position: When the cam ring slides, timing of signal read from the pulse of the sensor installed to the cam ring varies. ECM calculates the time difference between this signal and signal of the crank position sensor and calculates the cam position.
Legend 1. (–) Pin 2. (+) Pin Legend 1. Iron core 2. Magnetic flux 3. Permanent magnet 4. Coil 5. Pulser 1 2 LNW21AMH000101 1 2 4 3 5 LNW21ASH000701