258 ENGINE 273 MPFI Refitment of T-MAP sensor • Check the O-ring fitment of the T-MAP sensor. • Refit the screws of the T-MAP sensor by screw driver. • Refit the T-MAP sensor connector. Stand Alone Diagnosis Refer 3.11.5 Trouble Shooting and Diagnosis. SystemDiagnosis • Use TATAdiagnostic tool. On vehicle Removal, Inspection & Refitment Procedure Removal of T-MAP sensor • Remove the T-MAP sensor connector. Precaution : • Pull the connector after pressing the lock. • Remove the screws of the T-MAP sensor. • Take out the T-MAP sensor. Inspection of T-MAP sensor • Check the resistance of T-MAP sensor. KNOCK SENSOR : Working Principle: Knock sensor is directly mounted on the cylinder block. When knock occurs due to the uncontrolled combustion, vibrations are generated on the block. These vibration forces cause a charge transfer and a voltage is generated by the sensor element. This is tapped off by contact discs and passed to the ECU where it is processed. System Integration: Sensor is fitted on to block directly so that the structure borne vibrations generated by the ‘knocking’ can be detected effectively. This will enable the ECU to limit the Ignition timing (advance) for optimum efficiency, without the knock damaging the engine.
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