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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: 73 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.
P0033-13: Turbocharger Bypass Valve Control Circuit– Circuit Open
Overview:
ISO Code
P0033-13
Customer Symptom
Boost Control strategy will not be active Driveability will get affected.
Fault Effects (On Vehicle)
Boost Control strategy will not be active, Bypass valve will be stuck closed.
Driveability will get affected
Lamp Status (If Any)
MIL ON after 3 drive cycles.
Fault Detection Condition
This fault gets logged if the Turbo charger by pass valve (Dump valve)
control pin of EMS ECU is Open Circuited.
Normal Operating Condition
Healthy wiring harness connections between EMS ECU and turbocharger
bypass valve
Probable Trouble Area
Wiring Harness connections, By pass valve (Dump valve), Faulty ECU
Healing Condition
Ignition ON and after 3 driving cycles of fault rectification
Fault permanent deletion:-
1. Clear DTC Command form Scan tool
2. Stack Over Flow.
3. 40 warm up cycles.
4. ECU Flashing.
5. ECU Power-Fail
Component Details:
Turbo Charger bypass (Dump) valve is a solenoid valve, whose magnetic coil is energized to open the valve. Valve
can be opened in any position between its 0% Opening to 100% Opening by controlling the magnetic coil
energization.
Preliminary Checks:
1) Loose/ Damaged Connections between bypass valve and EMS ECU.
2) Check for back out of pins at both bypass valve connector and ECU connector.
3) Check for damage of pins at both bypass valve connector and ECU connector.
4) Check the continuity bypass valve connector pins to the ECU pins.
5) Check whether the bypass valve is getting main relay power supply.
6) Need to check if any obstruction for actuating Dump valve.
7) Faulty ECU.