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: 1188 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. P1E04-12: Engine Start Stop Indication-Circuit short to battery Overview: ISO Code P1E04-12 Customer Symptom 1.ESS Autostop/Autostart function may get affect. 2.ESS Switch Led will not work Fault Effects (On Vehicle) 1.ESS Autostop/Autostart function may get affect. 2.ESS Switch Led will not work Lamp Status (If Any) CE Lamp ON after 1 driving cycle Fault Detection Condition Auto Start stop switch lamp indication pin 130 of EMS ECU short circuited to battery supply 155/156 Normal Operating Condition Auto Start stop lamp indication will turn ON and OFF properly Probable Trouble Area Improper wiring harness connections. Auto Start Stop LED indication shorted to battery supply. Healing Condition After 1 driving cycle and Ignition ON. Fault permanent deletion 1. Scan tool Service 14 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:- 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