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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: 936 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.
Diagnosis
With ignition key is 'ON' position and supply voltage at 5V DC, use multimeter to measure the signal voltage at pin no.
2 and 3.
Signal Volt = 0.68 V DC at idle position.
Signal Volt = 4.25 ± 0.15V DC at wide Open
throttle (WOT) position.
Connector details :
1.
ECU pin M1A3 : Ground
2.
ECU pin M1B4 : Signal
3.
ECU pin M2C3 : 5V supply
Use diagnostic tester to check throttle Sensor by pressing and releasing the accelerator pedal.