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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: 48 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.
Check oil control valve
Repair or replace
Go to Step 2
2. Check leakage in the oil gallery
Repair or replace
Go to Step 3
3. Check quantity of oil
If less top the oil
Go to Step 4
4
Check oil temperature
Wait to reduce the
temperature
Go to Step 5
5
Check alignment of camshaft
Repair or replace if
there is
missaligment
Go to Step 6
6
Check mechanically lock pin is proper
Repair or replace
Go to Step 7
7.
Check control spring is perfectly fine
Fix if it not fited
properly
Go to Step 8
8
Is there any rust/oxidization observed on VVT actuator
Terminals
Clean the Rust or
repair or replace
Go to Step 9
9
Is there wiring harness electrical continuity between ECU
pin 249 & VVT IN actuator pin 1.
Go to Step 10
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
10 Are there any pins damaged at VVT actuator /EMS ecu
Connector
Replace the
connector or wiring
harness
Go to step 11
11 Are there any pins backed out from the VVT Actuator/EMS
ecu Connector
Rectify/Replace
Connectors
Go to Step 12
12 Is VVT Actuator pin 249 short Circuited to
GND/Battery/Open
Go to Step 13
Repair the harness
as per the
schematic
13 Is VVT Actuator physically Damaged
Replace VVT
Go to Step 14
14 Are there any metallic particles/Burr in VVT actuators Tip?
Clean those
burr/metallic
particles
Go to step 15
15 Are there any faults related to VVT Actuators power supply
voltages
Replace these faults
by following their
rectification
procedure
Go to step 16
16 Fault Still Persists?
Replace VVT
Actuator and then
Fault still persists
then Replace EMS
ecu
Follow the steps
again for
reconfirmation
DTC’s confirmation:-
1. Fuel system status
2. Engine load
3. Engine coolant temperature.
4. Long term fuel trim.
5. MAP Sensor.