Volvo Workshop Manuals
940 L4-2.3L SOHC VIN 88 B230F (1992)
Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Crankshaft Position/Engine Speed Sensor <--> [Crankshaft Position Sensor] > Component Information > Specifications > Page 2082
Crankshaft Position/Engine Speed Sensor: Description and Operation
Crankshaft Position And Speed Sensor
PURPOSE AND LOCATION
The input signal for crankshaft position and engine speed is generated by the crankshaft position/speed sensor and sent to the ignition ECU (3).
The sensor is mounted close to the flywheel (2) which circumference is provided with a series of drilled holes.
The sensor (1) consists of a permanent magnet (4), a pole tip (5) which concentrates a magnetic field at the end of the device and a coil (6). The
Voltage is induced in the sensor when one of the "teeth" on the flywheel passes the tip. This variable signal is transmitted by wire to the ignition
In effect, the sensor supplies the ignition ECU with a unique altering voltage (an electrical picture) from which the ignition ECU can determine
The frequency (7) of the signal is used to determine the engine speed.
To provide a referance signal for the crankshaft position, one or more "teeth" on the flywheel circumference are made longer than others. The
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