1762 / 5157
OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 551 of 654
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.
P0048: Turbocharger/Supercharger Boost Control “A” Circuit High
Overview:
Description as per ISO
Standard
Turbocharger/Supercharge
r Boost Control “A” Circuit High
ECU Pin number
08
Customer Symptom
Engine restricted performance
Probable black smoke
Fault Effects (On Vehicle)
Disables EGR by setting desired rate to 0. This will affect
EGRH rate, EGRL rate, IFLAP, Throttle, Intake manifold
pressure and boost pressure.
Reduced Torque Mode gets activated.
Speed Pilot control dynamic will get disabled (Injector dynamic learning).
VGT actuator control will be disabled
Lamp Status (If Any)
MI Lamp ON
Fault Detection Condition
This fault gets logged if the VGT valve control pin of EMS ECU is short
circuited to battery supply.
Normal Operating Condition
Healthy wiring harness connections between EMS ECU and VGT Valve
Probable Trouble Area
Wiring Harness connections between VGT valve and EMS ECU, VGT Valve,
EMS ECU
Healing Condition
Ignition ON and after 1 driving cycles of fault rectification
Component Details:
A
Variable Turbine Geometry
turbocharger is also known as a
variable geometry turbocharger (VGT)
, or a
Variable
Nozzle Turbine (VNT)
. A turbocharger equipped with Variable Turbine Geometry has little movable vanes which can
direct exhaust flow onto the turbine blades. The vane angles are adjusted via an actuator. The angle of the vanes varies
throughout the engine RPM range to optimize turbine behavior.
Preliminary Checks:
x
Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If yes,
go ahead with next steps. If not, check for other DTC’s presence.
x
Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to earlier
issue closure.
x
Loose/ Damaged Connections between VGT Actuator and EMS ecu? If found rectify as per schematics.
x
Check for back out of pins at both VGT Actuator connector and EMS ECU connector. If found rectify
x
Check for damage of pins at both VGT Actuator and EMS ECU connector. If found rectify / replace connectors.
Trouble Shooting:
Step Checks
IF YES
IF NO
1.
Check whether the VGT Actuator connector is fitted
properly.
Go to Next Step
Fit the connector
properly