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: 1055 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. Are Relay Contacts weld / Stuck Open Replace the Relay Go to Step 2 2. Check supply at ECU pin 155 & PIN 156 If supply is available after powerlatch time of ECU then relay check the wiring harness , Check Main relay & relace if requried Establish continuity by rectifying harness connections as per the circuit schematic 3. Are there any pins damaged at EMS ECU Connector Replace the connector or wiring harness Go to step 4 4 Are there any pins backed out from the EMS ECU Connector Rectify/Replace Connectors Go to Step 5 5 Is relay getting Supply at its pin Go to Step 6 Repair the harness as per the schematic 6 Is Main Relay control Pin 115, Short circuited to UBat Repair the harness as per the schematic Go to Step 7 7 Fault Still Persists? Replace relay and then if Fault still persists then Replace EMS ECU Follow the steps again for reconfirmation DTC’s confirmation:- After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing over to customer. Crank the Engine, Bring the Key position from Ignition ON to Ignition OFF, Engine shall stop.