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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: 1074 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.
Is there any rust/oxidization observed on Accelerator Pedal
Sensor Terminals
Clean the Rust or
repair or replace
Go to Step 9
9.
Is there wiring harness electrical continuity between
ECUpins 121,138, 105 &Accelerator pedal Sensor 1
Sensor connector pins 4,2,3.
Go to Step 10
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
10. Are there any pins damaged at Sensor/EMS ECU
Connector
Replace the
connector or wiring
harness
Go to step 11
11 Are there any pins backed out from the Sensor/EMS ECU
Connector
Rectify/Replace
Connectors
Go to Step 12
12 Is Sensor Supply Pin 138 Short Circuited to GND/Battery.
Repair the harness
as per the schematic Go to step 13
13 Is Sensor Signal Pin 121 Short Circuited to GND/Battery?
Repair the harness
as per the schematic Go to Step 14
14 Is Sensor physically Damaged
Replace Sensor
Go to Step 15
15 Fault Still Persists?
Replcae Sensor and
then Fault still
persists then
Replace EMS ECU
Follow the steps
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.
x
Turn the Ignition OFF and then turn it ON. Recheck the fault, Fault shall not reappear.