140 ENGINE2.2LDICOR Fig. 227 Fig. 228 Fig. 229 4. Knock sensor (Accelerometer) (Fig. 227) The knock sensor is fitted on the cylinder block. The knock sensor is a mechanical vibration sensitive transducer mounted on engine block and generates a vol tage proport ional to the mechanical vibration in a pre determined location. It senses the knocking in the cylinders during combustion. It is a wide brand sensor gives high output and flat response. The injector performance is optimally controlled over the life of engine based on knock sensor output. Note While assembling the knock sensor, ensure that it has to be inclined 30 ± 50 as shown in the fig. 5. SIMAFSensor (Fig. 228) This sensor is mounted between air filter and turbocharger. It gives Information about the amount of air quantity & temperature entering the engine. This input is used by the ECU for corrections of fuel quantity based on amount of air availability for optimization of exhaust gas circulation & the turbocharger control. While assembling, theAMF sensor the point of the arrow should be towards the Turbo charger. 6. Coolant Temperature Sensor (Fig. 229 & 230) A semi conductor material changes its resistance when exposed to variable temperature source. Resistance decreases as temperature increases. There are two temp sensors fitted on water box. White coloured sensor provides engine operating temperature input to the Instrument cluster and the brown coloured sensor provides engine operat ing temperature input to the ECU. Corrections for injection parameters are done by the ECU based on coolant temperature to run the engine wi th maximum ef f iciency at al l temperatures.
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