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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 558 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.
P0234: Turbocharger / Super Charger A Over Boost condition
Overview:
Description as per ISO
Standard
Turbocharger/Supercharger "A" Under boost Condition
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)
CE Lamp ON
Fault Detection Condition
This fault gets logged if the error between the Boost demand and boost
pressure feedback is too high.(Boost feedback is far greater then Boost
demand)
Normal Operating Condition
Boost Pressure feedback from sensor is as per the Boost demand through
VGT.
Probable Trouble Area
Inlet Air circuit clogged, Air filter clogged, Charge air leakage in inlet air
circuit, Turbo / Intercooler hoses / pipes damage.
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
Check for damage of Hoses / pipes connected in the Inlet air circuit (Intercooler, Turbo charger)
x
Check for clogging of Air filter / Inlet air circuit.
x
Check f
or P0045 / P0047 / P0048 / P0237 / P0238 / P1235 / P1236 / P1237 / P1238 DTC’s. If found rectify by
following their rectification procedure.