Sensor And Switch - Suzuki DF150 Service Manual

SENSOR AND SWITCH

CKP (Crankshaft Position) SENSOR
There is one (1) CKP sensor installed below the flywheel rotor.
When the reluctor bars on the flywheel pass the sensor, a signal
(voltage pulse) is generated and sent to the ECM.
This is the fundamental signal used to judge engine speed and
crankshaft angle.
There are 34 reluctor bars, spaced 10 degrees apart, followed
by a 20 degree index space. During one crankshaft rotation, 34
signals are input to the ECM.
CMP (Camshaft Position) SENSOR #1
• CMP sensor #1 is mounted on the cylinder head cover with
trigger vanes pressed onto the end of the exhaust camshaft.
This sensor detects piston position.
• Signals received from this sensor are also used by the ECM
to determine sequential fuel injection and ignition control.
• The CMP sensor contains a "Hall Effect" semiconductor and a
magnet. The semiconductor generates a voltage in proportion
to the line of magnetic force passed through it. When a trigger
vane on the camshaft reluctor aligns with the sensor' internal
magnet, a large amount of magnetic force is generated allow-
ing a high voltage to pass through the semiconductor. When
the trigger vane moves away from the sensor, no magnetic
force is generated and low voltage passes through the semi-
conductor.
These generated voltages are rectified to create "ON" (high
voltage) & "OFF" (low voltage) signals to the ECM.
• The ten camshaft trigger vanes provide ten high voltage sig-
nals from CMP sensor to ECM during one camshaft rotation
(two rotations of crankshaft).
ENGINE CONTROL SYSTEM
1
1. CKP sensor
2. Reluctor bar
1
1. CMP sensor #1
Camshaft
Trigger vane
"Hall Effect" semiconductor
Magnet
CMP sensor
High voltage
Low voltage
3-9
2