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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: 33 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 240 & 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 240 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:-
After rectification, ensure the following points by referring engine parameters using TML diagnostic tool before
handing over to customer.
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