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: 1050 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. P302F-1: Detection of an Early Opening Main Relay– General Electrical Failure Overview: ISO Code P302F-1 Customer Symptom 1. ECU will be switched off immediately without completing postdrive(loss of data may occur) 2..In long term ECU can be damaged Fault Effects (On Vehicle) 1. ECU will be switched off immediately without completing postdrive(loss of data may occur) 2..In long term ECU can be damaged Lamp Status (If Any) No Lamp Indication Fault Detection Condition This fault gets logged if the Main relay control pin of EMS ECU is not getting supply from battery. Normal Operating Condition Healthy wiring harness connections between Main Relay and EMS ECU Probable Trouble Area Wiring Harness Connections, Main Relay Pin Connection, Main Relay Condition, Faulty Fuse, Low Battery Healing Condition Ignition On or Engine After Run & after 1 drive cycles of fault rectification. Fault permanent Deletion 1. Clear DTC Command form Scan tool 2. Stack Over Flow. 3. 40 warm up cycles. 4. ECU Flashing. 5. ECU Power-Fail Component Details: Majority of the EMS components gets the power supply after the Main Relay is switched on by EMS ECU. Preliminary Checks: 1. Check Relay Control Pin 2. Check Supply line from Battery to ECU also Battery to Main Relay 3. Check Main Relay is in Good Condition 4. Check whether Fuse is faulty. 5. Check the Battery condtion.