NEXON DIAGNOSTIC MANUAL

Nexon Gasoline – EMS ECU Bosch

DTC Troubleshooting Manual

Version: 0.1

Date: 26-08-2017

Prepared By: Sunu S Babu/Yogesh Jadhav

Checked By: Yeshwant Jadhav

Approved By: Satish Kumar

Document Part No: 2921 02 224 A1736

Page: 1099 of 1203

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.

Trouble Shooting:-

Step Checks

IF YES

IF NO

Are Relay Contacts weld / Stuck Open?

Replace the Relay

Go to Step 2

Is there wiring harness electrical continuity between ECU

pin 211 & Starter relay coil pin X&& between the Main

Relay supply and the relay Coil pin X. Also check continuity

between the Starter Relay contact pin to Starter Relay-2

contact pin X&& Starter Relay contact pin X and Battery

supply.

Go to Step 3

Establish continuity

by rectifying

harness

connections as per

the Circuit

schematic

3. Are there any pins damaged at EMS ecu Connector

Replace the

connector or wiring

harness

Go to step 4

Are there any pins backed out from the EMS ecu Connector Rectify/Replace

Connectors

Go to Step 5

Is relay getting Supply at its pin

Go to Step 6

Repair the harness

as per the

schematic

Is Starter Relay-2 control Pin 211, Short Circuited to

GND/Battery

Repair the harness

as per the schematic Go to Step 7

Is there DTC P3005-13 also present

Follow its

rectification

procedure and

rectify this fault

Go to step 8

Fault Still Persists?

Replace relay and

then if Fault still

persists then

Replace EMS ecu

Follow the steps

again for

reconfirmation

DTC’s confirmation:-

After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before

handing over to customer.

1. Crank the vehicle, if Vehicle starts then confirm that fault got rectified.