TATA BSVI Gasoline_Bifuel Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.9 Date: 24-01-2022 Prepared By: Veer K. Singh / Prudhvi B Varma Checked By: Yeshwant Jadhav Approved By: Sanjeev M. Document Part No: 2921 02 xxx xxxx Page: 1163 of 1692 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. 2. Stack Over Flow. 3. 40 warm up cycles. 4. ECU flashing 5. ECU power fail Component Details: It is a non latch able switch. Its operating temperature is -40 to 85 deg C and operating voltage is 9 to 16V. its lifecycle is 1,00,000 cycles. Preliminary Checks: 1) Loose/ Damaged Connections between Auto Start Stop Lamp indication and EMS ECU. 2) Loose/ Damaged Connections between Auto Start Stop Lamp indication pin 130 & Battery supply pin 155/156. 3) Check for back out of pins at Auto Start Stop connector. 4) Check for damage of pins at Auto Start Stop connector. Trouble Shooting:- DTC’s Healing Confirmation: - After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before handing over to customer. Auto Start stop lamp indication will turn ON and OFF properly Circuit Schematic Diagram: Step Checks IF YES IF NO 1. Is there wiring harness electrical continuity between ECU pin 130 & Auto Start Stop LED Lamp indicator Go to Step 2 Establish continuity by rectifying harness connections as per the circuit schematic 2. Are there any pins damaged at EMS ECU Connector Replace the connector or wiring harness Go to step 3 3 Are there any pins backed out from the EMS ECU Connector Rectify/Replace Connectors Go to Step 4 4 Is ESS lamp indication Pin 130, Short circuited to GND/Battery Repair the harness as per the schematic Go to Step 5 5 Fault Still Persists? Replace switch and then if Fault still persists then Replace EMS ECU Follow the steps again for reconfirmation
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