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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: 1019 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 fuel regulator stuck Open
Replace fuel regulator Go to step 2
2
Perform the IO test for Fuel pump relay. Is test
successful?
Go to Step 4
Go to step 3
3
Are there any faults related to Fuel pump relay
Rectify them by
following their
rectification procedure
Go to step 4
4
Is Fuel pump relay stuck Open
Replace Fuel pump
relay
Go to step 5
5
Is Injector time delay correct
Go to step 6
Correct the timing
delay through
calibration
6
Perform the IO test for Throttle Valve. Is test successful?
Go to step 8
Go to step 7
7
Are there any faults related to Throttle valve
Rectify them by
following their
rectification procedure
Go to step 8
8
Is throttle valve stuck closed
Replace throttle valve Go to step 9
9
If the fault still persists
Replace the lambda
Sensor, if the fault still
persists then replace
EMS ecu.
Repeat the
procedure for
confirmation
DTC’s confirmation:-
After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before
handing over to customer.
Recheck the fault with TML diagnostic tool and confirm that fault hasn’t re appear.