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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: 585 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.
Injector standalone diagnosis:-
Injectors:
The injector is an indirect electrically driven valve (nozzle) that sprays high pressure fuel in an engine combustion
chamber. The fuel delivery is a function of the pressure at the nozzle seat.
The fuel injector is solenoid ball valve, top feed with a 2 pin connector. The solenoid valve normally closed by a ball
and a cone seat, Opens when the electromagnetic core is energized. Fuel under pressure in common rail flows
through metering orifice, where fine atomization of the fuel takes place and flows consistently for a given injector
Opening time.
The injector which is normally in closed position, receives drive signal from ECU to Open for a given pulse width (few
milli
seconds), depending on the engine operating conditions.
Functional Characteristics:-
A:- Pressure Range:-
Min operating pressure:- The injector starts to inject at an inlet pressure above 150 bar
Max normal operating pressure:- The maximum nominal operating inlet pressure under normal conditions is 1600 bar.
Max peak operating pressure:- The injector is able to endure up to 2100 bar inlet pressure for 10 hours and the
injector characteristics remain within original tolerances when a normal operating pressure is used after this condition.
Stand alone diagnosis:
Diagnosis
Connector details
Injector 1
1. ECU pin M2H2 : signal
2. supply voltage - 12V
Injector 2
1. ECU pin M2G3 : signal
2. supply voltage - 12V
Injector 3
1. ECU pin M2G2 : signal
2. supply voltage - 12V
Injector 4
1. ECU pin M2H3 : signal
2. supply voltage - 12V
Use multimeter to check coil resistance
which should be 12.25ohms ± 0.5ohms