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: 226 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.

P0122-11: Throttle/Pedal Position Sensor/Switch “A” Circuit Low– Circuit Short to Ground or Open

Circuit

Overview:

ISO Code

P0122-11

Customer Symptom

Vehicle /engine speed will be restricted

Fault Effects (On Vehicle)

1. Vehicle runs with calibratable speed limitation.

Lamp Status (If Any)

MIL ON after 1drive cycle

Fault Detection Condition

This fault gets logged if the throttle position Sensor signal pin 203 is short

Circuited to ground or Open

Normal Operating Condition

Throttle actuator functions as per design

Probable Trouble Area

Throttle Actuator and position Sensor ,wiring harness connections, EMS

ECU

Healing Condition

After 3 drive cycles

Fault permanent deletion

1. Clear DTC Command form Scan tool

2. Stack Over Flow.

3. 40 warm up cycles.

4. ECU Flashing.

5. ECU Power-Fail

Component Details:

A DC motor drive is used to move the throttle valve over the complete movement range. The DC motor is directly

controlled by the ECU of the Gasoline engine. Throttle Valve H-bridge driver of EMS ECU provides bidirectional

control with active recirculation and over current detection.

Preliminary Checks:

1. Check whether dust/mud/any particle is blocking throttle valve.

2. Check whether the throttle valve is stuck closed

3. Check for any throttle body related faults and rectify those faults by following their rectification procedure.

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