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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: 303 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.
Trouble Shooting:-
Step Checks
IF YES
IF NO
1
Check the Injector Connector for any damage
Replace connector
Go to step 2
2.
Is there any dirt or Rust on Connector
Remove the
connector and clean
it and refit it tightly
Go to Step 3
3
Perform the Injector cylinder 1 actuator test. Is the test
successful
Go to step 4
Some problem in
Wiring harness
connections
4.
Check the continuity between the EMS ECU pin 244 and
connector pin 1. Check the continuity between the injector
connector pin 2 and EMS main relay supply. Is continuity
test successful
Go to step 5
Establish continuity
by rectifying wiring
harness
connections as per
the schematic.
5.
Is the Injector connector pin 1 short Circuited to
battery/Ground. Perform this test by keeping Ignition Off.
Go to Step 6
Rectify Wiring
Hanress
connections as per
the schematic
6.
Check whether the Injector LSD and EMS ECU pin 244 is
Open Circuited.
Rectify Wiring
Harness
connections as per
the schematic
Go to step 7
7
Is the resistance between the Injector 1 and EMS ECU less
than 1 ohm?
Go to Step 8
Replace the
Injector 1 wiring
Hanress
8. Is the resistance across the injector terminals less than
12.25 ohms?
Go to Step 9
Replace the
Injector of cylinder
1
9.
Check whether any injector pins are backed out at ECU
Connector or Injector connector
Rectify the
connections
Go to Step 10
10 Is there any physical damage to Injector connector / ECU
Connector
Replace the
respective
connectors
Go to step 11
11 If the fault still persists
Replace the EMS
ECU
Repeat the above
procedure for
reconfirmation
DTC’s confirmation:-
After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before
handing over to customer.
1. Perform the Injector of cylinder 1 actuator test. Test result should be successful.
2. Check the resistance across the injector of cylinder 1, it should be less than 12.25 ohms.
3. Remove the injector connector and check the wiring harness resistance between the EMS ECU and the
connector, it should be less than 1 ohm.