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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: 653 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.
Is the Brake Switch setting proper?
Go to step 2
Correct the setting
as per the Brake
switch TML
drawing
2.
Is there continuity exists between Main Brake switch pin X
and EMS ECU pin 135 && Main brake switch pin X and
battery supply.
Go to step 3
Rectify the wiring
harness
connections as per
the schematic
3.
Is there continuity exists between Brake redundant switch
pin X and EMS ECU pin 147 && redundant brake switch pin
X and Ignition supply.
Go to step 4
Rectify the wiring
harness
connections as per
the schematic
4.
Check whether EMS ECU pins 135 / 147 shorted to battery
supply / Ground
Go to step 5
Rectify the wiring
harness
connections as per
the schematic
5
Are there any pins damaged at EMS ECU Connector
Replace the
connector or wiring
harness
Go to step 6
6
Are there any pins backed out from the EMS ECU
Connector
Rectify/Replace
Connectors
Go to Step 7
7
Is Brake switch connector damaged or pins got backed out. Rectify/Replace
Connectors
Go to step 8
8
If fault still persists,
then replace brake
switches and if fault
still persists then
replace EMS ECU.
Follow the above
procedure again for
reconfirmation
DTC’s confirmation:-
After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before
handing over to customer.
Turn the Ignition On, press the brake pedal for 3 or 4 times and then check the DTC’s again. DTC shall not reappear.