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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: 950 of 1203
Copyright ©
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.
Electronic Throttle Body:
The throttle body contains an actuator, a throttle plate and a throttle position Sensor (potentiometer), which are
integrated into one housing. The actuator consists of a DC-Motorand a two-stage gear. The throttle position Sensor is
redundant and provides two output signals. In case of an electrical disconnection, the throttle plate returns to an idle
default position (LHP) which is between lower and upper mechanical stops (LMS and UMS, respectively).
The throttle position Sensor is mounted on intake manifold upstream side and is a part of integrated throttle body. The
TPS is mounted using a screw and tighten to the specified torque. The throttle lever is extended to crank lever which
operates the Sensor, wherein the Circuit resistance varies depending on the variation of movement of throttle lever.
The throttle position Sensor is a linear potentiometer type with a two pin connector blade with integrated 3-way
connector.
Depending on the variation of the external Circuit resistance due to movement of the throttle lever shaft, a fixed DC
input voltage (5V DC) to Sensor provides a variable DC output voltage.
Operating Principle:
EMS ECU controls the input voltage of the DC Motor to control the throttle plate Opening. Throttle position Sensors
provide the position of the throttle plate to EMS ECU to make it a closed loop control.