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: 786 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. Is there wiring harness electrical continuity between ECUpin 131&AC relay pin X. Also Check continuity between the Main Relay supply and the AC relay pin X. Also check continuity from AC Relay pin X to GND. Go to Step 3 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 AC Relay control Pin 131, Short circuited to GND Repair the harness as per the schematic Go to Step 7 7 Is AC Compressor Working or stalled Rectify / Replace AC Compressor Go to Step 8 8 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. Perform Actuator test of AC Relay. Test should be successful.