Suzuki DF200/DF225/DF250 V6 4-Stroke Outboards Service Manual, Page 71Get this manual
ENGINE CONTROL SYSTEM
SENSOR AND SWITCH
CKP (Crankshaft Position) SENSOR There is one (1) CKP sensor installed below the flywheel rotorWhen the reluctor bars on the flywheel pass the sensor, signal (voltage pulse) is generated and sent to the ECMThis is the fundamental signal used to judge engine speed and crankshaft angleThere are 34 reluctor bars, spaced 10 degrees apart, followed by 20 degree index spaceDuring one crankshaft rotation, 34 signals are input to the ECMCMP (Camshaft Position) SENSOR #1 For DF250 model: CMP sensor #1 is mounted on the PORT cylinder head cover with trigger vanes pressed onto the end of the PORT exhaust camshaftThis sensor detects piston position For DF200225 models: CMP sensor #1 is mounted on the STBD cylinder head cover with trigger vanes pressed onto the end of the Intake camshaftThis sensor detects piston position Signals received from this sensor are also used by the ECM to determine sequential fuel injection controlThe CMP sensor contains "Hall Effect" semiconductor and magnetThe semiconductor generates voltage in proportion to the line of magnetic force passed through itWhen trigger vane on the camshaft reluctor aligns with the sensor' internal magnet, large amount of magnetic force is generated allowing high voltage to pass through the semiconductorWhen the trigger vane moves away from the sensor, no magnetic force is generated and low voltage passes through the semiconductorThese generated voltages are rectified to create "ON" (high voltage)"OFF" (low voltage) signals to the ECMThe four camshaft trigger vanes provid four high voltage signals from CMP sensor to ECM during one rotation of camshaft (two rotations of crankshaft)