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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: 129 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.
Component Specification:-
Sensor Stand alone Diagnosis:-
The lambda Sensor is mounted on the closed couple catcon. The lambda Sensor has a four pin connector with a
special ceramic body and gas permeable platinum electrodes on the surface. When the ceramic body is exposed to
temperature 350
0
C, oxygen in the air diffuses into ceramic body. Depending on the porosity electrodes which are
exposed to gas having varied level of oxygen. The lambda Sensor provides air/fuel ratio signal in mili volts to ECU as
a function of
varying air/fuel ratio.
At 350
0
C,
Lambda
= 0.97 - 800 mV ± 55 mV(Rich mixture)
Lambda
= 1.1 - 50 mV ± 30 mV (Lean mixture)
Diagnosis:-
Connector details
Terminal 1 :- 12 V Supply
Terminal 2 :- ECU pin number M1E2 (Heater)
Terminal 3 :- ECU pin number M2B3 (-ve)
Terminal 4 :- ECU pin number M2A3 (+ve)
Use TATA diagnosis tool to check for :
Signal voltage - > than 0.5V or < than 0.4V
Switching frequency - > than 0.2 Hz
Use multimeter to check the heater function by measuring the heater resistance.
Heater resistance at room temperature
–
90
ohms
Supply voltage - 5V DC
Check the signal voltage (Between pin number 2 and 3)
Signal Voltage - 0.68 ± 0.25V DC- at idle position
Signal Voltage - 04.25 ± 0.45V DC
–
at WOT position
Lifetime of the Sensor:-
The technical development of the Sensor is aligned to a service life of160.000 km and a maximum life time of 10
years.A Sensor with the protection tube variation is designedfor a service life of 250.000 km and a maximum life time
of 15 years.
Temperature dependant Heater Resistance plot:-