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: 995 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 the Brake Switch setting proper? Go to step 2 Correct the setting as per the Brake switch TML drawing 2. Is there continuity exists between Main Brake switch pin X and EMS ECU pin 135 && Main brake switch pin X and battery supply. Go to step 3 Rectify the wiring harness connections as per the schematic 3. Is there continuity exists between Brake redundant switch pin X and EMS ECU pin 147 && redundant brake switch pin X and Ignition supply. Go to step 4 Rectify the wiring harness connections as per the schematic 4. Check whether EMS ECU pins 135 / 147 shorted to battery supply / Ground Go to step 5 Rectify the wiring harness connections as per the schematic 5 Are there any pins damaged at EMS ECU Connector Replace the connector or wiring harness Go to step 6 6 Are there any pins backed out from the EMS ECU Connector Rectify/Replace Connectors Go to Step 7 7 Is Brake switch connector damaged or pins got backed out. Rectify/Replace Connectors Go to step 8 8. Is there any rust/oxidization observed on Accelerator Pedal Sensor Terminals Clean the Rust or repair or replace Go to Step 9 9. Is there wiring harness electrical continuity between ECUpins 121,138, 105 &Accelerator pedal Sensor 1 Sensor connector pins 4,2,3. Go to Step 10 Establish continuity by rectifying harness connections as per the Circuit schematic 10. Are there any pins damaged at Sensor/EMS ECU Connector Replace the connector or wiring harness Go to step 11 11 Are there any pins backed out from the Sensor/EMS ECU Connector Rectify/Replace Connectors Go to Step 12 12 Is Sensor Supply Pin 138 Short Circuited to GND/Battery. Repair the harness as per the schematic Go to step 13 13 Is Sensor Signal Pin 121 Short Circuited to GND/Battery? Repair the harness as per the schematic Go to Step 14 14 Is Sensor physically Damaged Replace Sensor Go to Step 15 15 Fault Still Persists? Replcae 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.  Turn the Ignition OFF and then turn it ON. Recheck the fault, Fault shall not reappear.