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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: 517 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 Sensor Terminals Clean the Rust or
repair or replace
Go to Step 2
2.
Is there wiring harness electrical continuity between
ECUpins201,213 &Crank Sensor connector pins 1,2. Also
Check continuity between the Main Relay supply and the
Lambda Sensor Connector pin 1.
Go to Step 3
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
3. Are there any pins damaged at Sensor/EMS ECU
Connector
Replace the
connector or wiring
harness
Go to step 4
4
Are there any pins backed out from the Sensor/EMS ECU
Connector
Rectify/Replace
Connectors
Go to Step 5
5
Is EMS pin 201 short Circuited to GND/Battery
Go to Step 6
Repair the harness
as per the
schematic
6
Is EMS pin 213 short Circuited to GND/Battery
Repair the harness
as per the schematic Go to Step 7
7
Is Sensor physically Damaged
Replace Sensor
Go to Step 8
8.
Are there any metallic particles/Burr in Sensor Tip or
Flywheel teeth?
Clean those
burr/metallic
particles
Go to step 9
9.
Any Physical damage to flywheel?
Replace Flywheel
Go to Step 10
10 Is the Air Gap between Sensor tip and Flywheel according
to specification?
Go to step 11
Re-align the Crank
Sensor.
11 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.
a) Start the engine, in neutral gear and press the accelerator pedal fully (as quickly as possible) for engine to go from
Idle to fly up.
b) Stay at fly up for few seconds and suddenly release the accelerator for the engine to come back to idle.
Repeat the above cycle 3 to 4 times and check the DTC does not reappear.