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: 359 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.

P0193 - 15: Rail pressure sensor (circuit short to battery or open)- circuit short to battery or open

Overview:

DTC Description as per ISO standard

Rail pressure sensor -circuit short to battery or open

ECU Pin Number

Rail pressure sensor pin, A42, A62,A63

Customer Symptom

MIL Lamp ON

Fault Effects (On Vehicle)

Cruise control off, Torque limited, Particulate filter lamp,

Regen off

Lamp Status (If Any)

MIL On

Fault Detection Condition (Root cause)

At ignition On

Normal Operating Condition

No Fault Code

Probable Trouble Area

1. Rail pressure 5V supply short to battery supply

2. Pin A42 open circuit

3. Rail pressure signal pin A62 short to supply

4. Rail pressure sensor signal ECU pin A62 open circuit

5. Rail pressure ground pin A63 open circuit.

6. Rail pressure sensor faulty.

7. EMS ECU

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 (Inlet metering valve) 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.