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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: 531 of 654
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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.
P268C:
Cylinder 1 Injector Data Incompatible
Overview:
DTC Description as per ISO standard
Cylinder 1 Injector Data Incompatible
ECU Pin Number
-
Customer Symptom
Engine Idle speed will remain high
Fault Effects (On Vehicle)
Engine idle speed will be increased by EMS
Lamp Status (If Any)
CE lamp is on
Fault Detection Condition
This DTC gets logged due to I3C value for the Cylinder 1 Injector is not
written in the EMS ECU
Normal Operating Condition
No faults related to Injector C3I values write in EMS ECU.
Probable Trouble Area
EMS ECU, Injector C3I write not done
Healing Condition
Clear the errors, Ignition OFF to ON, engine idle & fly-up condition
Component Details:
The function of the fuel injection system is to provide the right amount of fuel at the right moment and in a suitable
condition for the combustion process. There must therefore be some form of measured fuel supply, a means of timing the
delivery and the atomization of the fuel.
Injector has two basic parts, the nozzle and the nozzle holder or body. When EMS energizes the injector solenoid, the
high-pressure fuel enters and travels down a passage in the body and then into a passage in the nozzle, ending finally in
a chamber surrounding the needle valve.
The needle valve will open when the fuel pressure acting on the needle valve tapered face exerts a sufficient force to
overcome the spring compression. The fuel then flows into a lower chamber and is forced out through a series of tiny
holes. The small holes are sized and arranged to atomize, or break into tiny drops, all of the fuel oil, which will then readily
burn. Once the EMS turns off the injection pulse, needle valve will shut quickly under the spring compression force.
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 whether the 20-digit alpha numeric character I3C code is available on the injector cylinder 1 sticker. If not
present, then call hot line to get assistance on resolution of issue.