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: 1010 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. P0254-12: Metering Unit electrical failure (circuit short to battery) Overview: DTC Description as per ISO standard Metering Unit electrical failure (open circuit) ECU Pin Number A06, A07 Customer Symptom MIL ON. Engine stop. Fault Effects (On Vehicle) Engine Stop (Starting disabled) Lamp Status (If Any) MIL ON1 (Lamp turn On immediately when fault detected) Fault Detection Condition (Root cause) Ignition ON Normal Operating Condition No Fault Code Probable Trouble Area Electrical connection from Inlet metering valve to ECU circuit short to battery. Healing Condition Repair the connection between ECU pin A06 & A07 and inlet metering valve. Clear through diagnostic tool Ignition OFF & ON Component Details: High pressure pump/Inlet metering valve or MPROP creates the system pressures required by the Common Rail Injection System for all operating conditions of the engine.The system pressure governing is by single actuator control strategy. 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. Check for any other faults presence related to ECU Internal power supplies; Follow rectification process for those faults, before proceeding further. 4. Check for electrical continuity between ECU to Inlet metering valve/MPROP connector as per circuit schematic and rectify electrical discontinuity if noticed. 5. Check Inlet metering valve/MPROP circuit wrong assembly/fitment etc
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