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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: 172 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.
P0204: Cylinder Number4 Injector - Open Circuit
Overview:
DTC Description as per ISO standard
Injector Circuit/Open
–
Cylinder 4
ECU Pin Number
44
Customer Symptom
Heavy Engine vibration noticed.
Fault Effects (On Vehicle)
Injector learning strategy (MDP, SPC Updation) is disabled,
Injector Balancing is deactivated,
IMV operates without RPC trims,
Disables RVD from the Cylinder No 3 Injector.
Disables Injector 2 Pulse correction based on wiring resistance BRC.
Reduced torque mode activated/ vehicle lacks performance.
EGR is disabled. This DTC will also cause P 0266 to appear.
Lamp Status (If Any)
CE & MIL Lamp is on.
Fault Detection Condition (Root cause)
This DTC gets logged if the Cylinder - 3 Injector is open circuit.
Normal Operating Condition
Diagnostic tool display the value of Injector status at idling
Probable Trouble Area
Injector Bank, ECU, Grounding points, Wiring harness
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
Loose/ Damaged Connections between injector and EMS ecu.
x
Check for back out of pins at both Injector connector and ECU connector.