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: 719 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. P0627-13: Fuel Pump Relay Control Circuit – Circuit Open Overview: ISO Code P0627-13 Customer Symptom Engine stalls and does not start Fault Effects (On Vehicle) Engine stalls and does not start Lamp Status (If Any) CE lamp ON after 1 drive cycle Fault Detection Condition This fault gets logged if the Fuel pump relay control pin of EMS ecu is Open Circuited Normal Operating Condition Proper Wiring Harness connections between EMS ecu and Fuel Pump relay. Probable Trouble Area Wiring harness Connections, Fuel Pump Relay Healing Condition Engine Running and 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: Fuel Pump is driven by a DC motor. EMS ecu controls the DC Motor supply voltage through Fuel Pump Relay to control the Fuel Flow / Pressure. EMS ecu energizes the Fuel Pump relay coil to provide power supply to the DC motor which drives the Fuel Pump. Preliminary Checks: 1) Loose/ Damaged Connections between Fuel pump Relay and EMS ecu. 2) Loose/ Damaged Connections between Fuel pump Relay and Battery supply or Ground. 3) Check for back out of pins at ECU connector. 4) Check for damage of pins at ECU connector. 5) Check the continuity from Relay to the ECU pin and From battery/Ground to Relay.