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: 176 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. Is there any rust/oxidization observed on Sensor Terminals Clean the Rust or repair or replace Go to Step 2 2. Is there wiring harness electrical continuity between ECUpins 215,205 &Coolant Temperature Sensor connector pins 1,2. Go to Step 3 Establish continuity by rectifying harness connections as per the Circuit schematic 3. Are there any pins damaged at Sensor/EMS ECU Connector Replace the connector or wiring harness Go to step 4 4 Are there any pins backed out from the Sensor/EMS ECU Connector Rectify/Replace Connectors Go to Step 5 5 Is Sensor Signal Pin 215 Short Circuited to GND/Battery Repair the harness as per the schematic Go to Step 6 6 Is Sensor physically Damaged Replace Sensor Go to Step 7 7 Check the resistance between the pins 215 & 205. Compare this resistance value with the Sensor Temperature – Resistance characteristics and check whether the Temperature corresponding to the Resistance value found is matching the Engine Parameter displayed on tool – Coolant Temperature. Go to Step 8 Replace Sensor 8 Fault Still Persists? Replace Sensor and then 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. Method A: Soak the vehicle for more than 12 hrs (preferably over night) Then check if all the system temperature values (coolant, fuel, inlet air) are close to each other. Method B: Check the resistance between the pins 215 & 205. Compare this resistance value with the Sensor Temperature – Resistance characteristics and check whether the Temperature corresponding to the Resistance value found is matching the Engine Parameter displayed on tool – Coolant Temperature.