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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: 843 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 there any rust/oxidization observed on any Sensor
terminal of Sensor Group A (Acc. Pedal Sensor 1 / AC
Refrigerant pressure Sensor / TMAP Sensor)
Clean the rust /
Rectify
Go to Step 2
2
Is there wiring harness electrical continuity between
ECUpin 138 &Acc. Pedal Sensor Connector pin 2
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
3
Is there wiring harness electrical continuity between
ECUpin 137 &AC Pressure Sensor Connector pin 1
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
4
Is there wiring harness electrical continuity between
ECUpin 125 & TMAP Sensor Connector pin 3.
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
5
Are there any pins damaged at TMAp, ACC. Pedal Sensor
1/ AC Pressure Sensor / EMS ECU Connector
Replace the
connector or wiring
harness
Go to step 6
4
Are there any pins backed out from the at TMAP, ACC.
Pedal Sensor 1/ AC Pressure Sensor /EMS ECU
Connector
Rectify/Replace
Connectors
Go to Step 7
5
Are EMS ECU pins 137/138/125 Short Circuited to
Battery?
Repair the harness
as per the schematic Go to Step 8
7
Is TMAP / AC Pressure Sensor/ Acc. Pedal 1 Sensor
physically Damaged
Replace
corresponding
Sensor
Go to Step 8
8
Fault Still Persists?
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.
Check for the Parameter - Sensor Reference Voltage C, it should be in the range of 4.7 to 5.3 volts.