1.2L REVOTRON ENGINE 183 V. CRANKSHAFT POSITION SENSOR COMPONENT DETAILS: The circuit decodes the signal given by an inductive based sensor (Variable Reluctance). Intended target is a wheel uniformly cut with 60 teeth and 2 teeth removed. The sensor output signal approximates a sine wave whose frequency is proportional to engine speed and amplitude is approximately proportional to engine speed. Active edge is generated from zero crossing point positive to negative transition. COMPONENT LOCATION PRELIMINARY CHECKS 1. Loose/Damaged Connections between sensor and EMS ECU. 2. Check for back out of pins at both sensor connector and ECU connector. 3. Check for damage of pins at both sensor connector and ECU connector. 4. Check the continuity from sensor connector pins to the ECU pins. 5. Physical damage to flywheel. 6. Improper Air Gap between sensor and flywheel. CONNECTOR DETAIL PINOUT DETAILS PIN DESCRIPTION 1 Ground - 2 Signal COMPONENT SPECIFICATION Crank angle sensor provides engine speed and crank angle input to ECU. 58 teeth are spaced at an angle of 60 each on the flywheel and two teeth missing at 114° ATDC (Top Dead Centre) of cylinder 1 allows the piston position to be determined. Crank angle sensor is positioned on these teeth, so that an AC voltage is induced in sensor coil, when the flywheel tooth projection passes through the sensor. The AC voltage is proportional to the speed of rotation. The sensor is mounted in the engine compartment. It is used for the detection of the crankshaft position and speed. The sensor detects the slots and teeth of a ferromagnetic target wheel and delivers an electrical signal according to the movements of the target wheel. Therefore the signal represents the speed and position of the crankshaft. Proper function of the sensor can only be covered, if the specified mating connector is properly assembled. All wire seals have to be in place. With an unsealed connector the sensor will not be waterproof. Crank angle sensor is an inductive type 2 pin connector, is mounted on cylinder block over the crank sensor wheel. Sensor gap to be maintained -: 1.0 ± 0.4 mm Mount the sensor using a suitable bracket and tighten the bolt to the specified torque. OPERATING PRINCIPLE Due to the rotation of a ferromagnetic target wheel in front of the DG the magnetic field of a magnet is modulated at the place of a coil, i.e. with a tooth in front of the DG the magnetic flux through the coil will increase, with a slot it will decrease. This modulation results in changes of the output signal/voltage. The change of the
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