TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

TATA BSVI Gasoline Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.2 Date: 18-12-2019 Prepared By: Sunita Mandlik Checked By: Yeshwant Jadhav Approved By: Satish Kumar Document Part No: 2921 02 xxx xxxx Page: 99 of 1498 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. Trouble Shooting:- Step Checks IF YES IF NO 1. Check the bypass valve Connector for any damage Replace connector Go to step 2 2. Is there any dirt or Rust on Connector Remove the connector and clean it and refit it tightly Go to Step 3 3 Perform the bypass valve actuator test. Is the test successful Go to step 4 Some problem in Wiring harness connections 4. Check the continuity between the EMS ECU pin 149 and connector pin 2. Check the continuity between the bypass valve connector pin 1 and EMS main relay supply. Is continuity test successful Go to step 5 Establish continuity by rectifying wiring harness connections as per the schematic. 5. Is the bypass connector pin 1 short Circuited to battery/Ground? Perform this test by keeping Ignition Off. Go to Step 6 Rectify Wiring Harness connections as per the schematic 6. Check whether the bypass valve control pin 149 is Short Circuited to battery/Ground or Open Circuited Rectify Wiring Harness connections as per the schematic Go to step 7 7. Is the resistance across the bypass valve terminals less than X ohms? Go to Step 8 Replace the Bypass valve 8 Check whether any bypass pins are backed out at ECU Connector or bypass valve connector Rectify the connections Go to Step 9 9 Is there any physical damage to bypass valve connector / ECU Connector Replace the respective connectors Go to step 10 10 If the fault still persists Replace the EMS ECU Repeat the above procedure for reconfirmation DTC’s confirmation:- After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing over to customer. Perform the actuator test for bypass valve / Dump valve. Test result should be successful.