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: 637 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.

P042E-72: EGR “A” Control stuck open – EGR high pressure valve actuator stuck open

Overview:

DTC Description (User Friendly)

EGR high pressure valve actuator stuck open

ECU Pin Number

A067, A088, A040, A079, A078

Customer Symptom

MIL ON, CEL OFF. Increased fuel consumption

Fault Effects (On Vehicle)

Slight rough Idle.

Lamp Status (If Any)

MIL ON, CEL OFF

Fault Detection Condition (Root cause)

The error condition is tested, when duty cycle has reached the

maximum value and finished when 5 sec is elapsed (−> PUSH

phase is finished). It is tested only once while EGR valve in

CLOSE position.

EGR DC Motor measured position > 6.99 mm

Normal Operating Condition

No fault

Probable Trouble Area

EGR Valve

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

An incomplete burnt gas in exhaust is return to the cylinder. EGR works by recalculating a portion of an engine's

exhaust gas back to the engine cylinder. Intermixing the incoming air with recalculated exhaust gas dilutes the mix with

inert gas and in turn reduce the combustion temperatures for reducing NOx emissions.

Preliminary Checks:

1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above

Table. If yes, go ahead with next steps. If not, check for other DTC’s presence.

2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with

respect to earlier issue closure.

3. Check for mechanical damage of EGR valve