Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 472 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent Step 7 Check for Air or Exhaust leak. Arrest leakages. - Step 8 If the problem persists, replace the O2 sensor 1 and check - Step 9 If the problem persists, refit the old O2 sensor 1, replace the O2 sensor 2 and check - Step 10 If the problem persists, replace both the O2 sensors and check - Verification condition: Drive the vehicle in city and highway conditions for 20 mins. Circuit Description: The only way to differentiate an Air Fuel Control issue from a WRAF sensor offset is to perform a cross check comparing the 2 WRAF sensor signals. The fault design is the same than for the WRAF 1 and WRAF 2 rationality diagnostics and the pumping current error is calculated as WRAF 2 pumping current minus WRAF 1 pumping current. Circuit Schematic Diagram:
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