Q501 4 Cylinder MT Application DTC Troubleshooting Data Version: 0.1 Date: 21-Sep-2018 Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta Checked By: Yogesh Jadhav Approved By: Satish Kumar P Page: 214 of 1052 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. P0628-11: Fuel pump relay command (circuit short to ground) Overview: DTC Description as per ISO standard Fuel pump relay command – circuit short to ground ECU Pin Number K71 Customer Symptom MIL ON Fault Effects (On Vehicle) Vehicle may not start. Lamp Status (If Any) MIL ON Fault Detection Condition (Root cause) Fuel pump relay command open circuit WH Fuel pump relay EMS ECU Normal Operating Condition No Fault Code Probable Trouble Area Fuel pump relay command open circuit Wiring harness Fuel pump relay EMS ECU Healing Condition Clear through diagnostic tool Ignition OFF & ON Component Details: Fuel pump relay connected to EMS ECU, ECU drive the fuel pump relay. Preliminary Checks: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes, go ahead with next steps. If not, check for other DTC’s presence. 2. Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier issue closure. 3. Fuel circuit 4. Loose/ Damaged Connections between fuel pump relay command and EMS ECU. 5. Check for back out of pins at both fuel pump connector and ECU connector. 6. Check for damage of pins at both fuel pump connector and ECU connector. 7. Atmospheric pressure sensor faulty?
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