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: 350 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.

P00C6 - 92: Minimum rail pressure (signal below lower limit) - Performance or Incorrect Operation

Overview:

DTC Description as per ISO standard

Minimum rail pressure – Performance or incorrect operation

ECU Pin Number

Rail pressure sensor pin, Inlet metering Valve connection

Customer Symptom

MIL Lamp ON

Fault Effects (On Vehicle)

Vehicle may not start

Lamp Status (If Any)

MIL On

Fault Detection Condition (Root cause)

At ignition On

Normal Operating Condition

No Fault Code

Probable Trouble Area

1. Fuel System leak

2. Fuel pressure sensor

3. Fuel injector(s)

4. Fuel pressure regulator

5. High pressure delivery pump

6. Fuel system contamination

Healing Condition

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

Rail pressure sensor is a piezoelectric type one, which is used to measure the fuel pressure inside the Rail. It provides the

Pressure in terms of voltage to the ECU. This rail possesses an under pressure supply of diesel fuel which is ready to be

Used by the injectors. The drop of pressure in the rail is immediately signalled by the sensor to the engine control unit.

This is followed by the restoration of pressure in the pump. It is the engine control unit that controls the fuel supply of the

rail from a pump possessing very high pressure. This is done by using a valve for controlling the pressure of fuel.

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 Rail pressure, injector, IMV connector as per circuit schematic

and rectify electrical discontinuity if noticed.

5. Check inlet air circuit for clogging; wrong assembly/fitment etc; Clean the inlet air circuit and remove any clogging.