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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: 811 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 B (Acc. Pedal sensor 2 / Throttle
Position Sensor / Boost Pressure Sensor)
Clean the rust /
Rectify
Go to Step 2
2
Is there wiring harness electrical continuity between
ECUpin 126 &Acc. Pedal Sensor Connector pin 1
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the circuit
schematic
3
Is there wiring harness electrical continuity between
ECUpin 223 &Throttle Position Sensor Connector pin 3
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the circuit
schematic
4
Is there wiring harness electrical continuity between
ECUpin 210 &Boost Pressure 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 Boost Pressure Sensor/
ACC. Pedal sensor 2/ Throttle Position Sensor / EMS ECU
Connector
Replace the
connector or wiring
harness
Go to step 6
4
Are there any pins backed out from the at Boost Pressure
Sensor/ ACC. Pedal sensor 2/ Throttle Position Sensor
/EMS ECU Connector
Rectify/Replace
Connectors
Go to Step 7
5
Are EMS ECU pins 210/223/126 Short circuited to Ground /
Battery
Repair the harness
as per the schematic Go to Step 8
7
Is Boost Pressure Sensor/ ACC. Pedal sensor 2/ Throttle
Position 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 A, it should be in the range of 4.7 to 5.3 volts.