ENGINE 273 MPFI 263 ENGINE Stand Alone Diagnosis Refer 3.11.5 Trouble Shooting and Diagnosis. • Use Multimeter • Measure heater resistance between pin no. 1 & pin no. 2 @ room temp. = 9 Ohm. SystemDiagnosis • Use TATAdiagnostic tool. On vehicle Removal, Inspection & Refitment Procedure Removal of Oxygen sensor • Remove the Coupler of oxygen sensor. Precautions : • Ensure the coupler be unlocked while removing the connection. Inspection of oxygen sensor: • Check the heater coil resistance of the O2 sensor. (Refer 3.11.5 Trouble Shooting and Diagnosis.) Precaution : • Ring spanner should not inserted from the connector side. • Reconnect the coupler. Precaution : • Ensure that the connector is properly locked. VEHICLE SPEED SENSOR Type Hall Effect sensor Location: This vehicle speed sensor is mounted on the transaxle on speedo output location Working Principle This sensor is a semiconductor device, employing Hall Effect switches. It provides On/Off pulses, when a rotating metallic object interrupts the magnetic field. System Integration Vehicle speed sensor sends output pulses to cluster for speed indication. Instrument Cluster provides buffered output to EMS ECU. Signal transfer is 1:1
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