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: 166 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.

U0439-81: Invalid Data Received From All Terrain Control Module : Fault to be logged for Drive Mode Function

when: ModeSelectionSwStateStatusNew ==2 (Implausible)

Overview:

DTC Description (User Friendly)

Invalid Data Received From All Terrain Control Module : Fault

to be logged for Drive Mode Function when:

ModeSelectionSwStateStatusNew ==2 (Implausible)

ECU Pin Number

K034 – Input signal to EMS from ECO Mode Switch

Customer Symptom

Engine will run in default normal / City

mode.MIL

, CEL OFF

Fault Effects (On Vehicle)

Engine will run in default normal / City mode.

Lamp Status (If Any)

Fault Detection Condition (Root cause)

Fault to be logged for Drive Mode Function when:

ModeSelectionSwStateStatusNew ==2 (Implausible)

Normal Operating Condition

Sports Mode and Economy mode functions as per design

intention.

Probable Trouble Area

Wiring harness connections, Sports mode switch, Eco mode

switch, EMS ecu.

Healing Condition

After 3 drive cycles of fault rectification.

Component Details:

Sports / Economy mode switch is a Normally Open - latchable rotary Switch. Whose electrical contacts will be closed

when the rotary Switch is rotated to specific positions.

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 whether the contacts of the Drive mode switch are stuck closed.

4. Check for damage of Drive mode switch connector / EMS ECU connector.

5. Check for damage of Drive Mode switch pins / EMS ECU pins.

Trouble Shooting: