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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: 43 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 mechanically lock pin is proper
or repair or replace
Go to Step 2
2. Check control spring is perfectly fine
Fix if it not fited
properly
Go to Step 3
3. Is there any rust/oxidization observed on VVT actuator
Terminals
Clean the Rust or
repair or replace
Go to Step 4
4
Is there wiring harness electrical continuity between ECU
pin 249 & VVT IN actuator pin 1.
Go to Step 5
Establish continuity
by rectifying
harness
connections as per
the Circuit
schematic
5
Are there any pins damaged at VVT actuator /EMS ecu
Connector
Replace the
connector or wiring
harness
Go to step 6
6
Are there any pins backed out from the VVT Actuator/EMS
ecu Connector
Rectify/Replace
Connectors
Go to Step 7
7.
Is VVT Actuator pin 249 short Circuited to
GND/Battery/Open
Go to Step 8
Repair the harness
as per the
schematic
8
Is VVT Actuator physically Damaged
Replace VVT
Go to Step 9
9
Are there any metallic particles/Burr in VVT actuators Tip?
Clean those
burr/metallic
particles
Go to step 10
10 Are there any faults related to VVT Actuators power supply
voltages
Replace these faults
by following their
rectification
procedure
Go to step 11
11 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.
6. Engine Speed.
7. Vehicle Speed.
8. Spark timing.
9. Absolute throttle position.
10. Distance Travelled after MIL ON.
11. Distance travelled since fault memory last cleared.
12. Battery voltage.
Recheck the fault, fault shall not reappear