HARRIER BOOK 2

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

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.

Check Inlet metering valve/MPROP circuit wrong assembly/fitment etc