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: 911 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

Is there any rust/oxidization observed on Sensor Terminals Clean the Rust or

repair or replace

Go to Step 2

Is there wiring harness electrical continuity between

ECUpins 223,203, 220 &Throttle Position Sensor connector

pins 3, 6, 5?

Go to Step 3

Establish continuity

by rectifying

harness

connections as per

the Circuit

schematic

3. Are there any pins damaged at Sensor/EMS ECU

Connector

Replace the

connector or wiring

harness

Go to step 4

Are there any pins backed out from the Sensor/EMS ECU

Connector

Rectify/Replace

Connectors

Go to Step 5

Is Sensor Supply Pin 223 Short Circuited to Battery/GND or

Open and throttle actuator control motor Pin 251 or Pin 252

gets Open Circuited?

Repair the harness

as per the schematic Go to step 6

Is Sensor Signal Pin 203/220 Short Circuited to

battery/GND or Open Circuited?

Repair the harness

as per the schematic Go to Step 7

Is Sensor physically Damaged

Replace Sensor

Go to Step 8

Fault Still Persists?

Replcae Sensor and

then 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.

Pls. perform the Throttle Actuator IO Control test. IF test is successful then the fault rectification is confirmed.