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advance. This is done to meet changing engine oper- The ignition coil is not oil filled. The windings are embedded in an epoxy compound. This provides heat Because of coil design, spark plug cables (second- ary cables) are not used. The cables are integral CRANKSHAFT POSITION SENSOR DESCRIPTION The Crankshaft Position (CKP) sensor is located near the outer edge of the flywheel (starter ringear). OPERATION Engine speed and crankshaft position are provided through the CKP sensor. The sensor generates pulses The sensor is a hall effect device combined with an internal magnet. It is also sensitive to steel within a The flywheel/drive plate has groups of four notches at its outer edge. On 2.5L 4-cylinder engines there The notches cause a pulse to be generated when they pass under the sensor. The pulses are the input The trailing edge of the fourth notch, which causes the pulse, is four degrees before top dead center The engine will not operate if the PCM does not receive a CKP sensor input. CAMSHAFT POSITION SENSOR-2.5L ENGINE DESCRIPTION On the 2.5L 4–cylinder engine the Camshaft Posi- tion (CMP) sensor is located in the distributor. OPERATION The sensor contains a hall effect device called a sync signal generator to generate a fuel sync signal. shaft Position (CKP) sensor to differentiate between Fig. 4 Sensor Operation—2.5L 4-Cyl. Engine 1 – CRANKSHAFT POSITION SENSOR Fig. 5 Sensor Operation—4.0L 6-Cyl. Engine 1 – CRANKSHAFT POSITION SENSOR 8D - 4 IGNITION SYSTEM XJ DESCRIPTION AND OPERATION (Continued) |