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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: 502 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.
P2147: Fuel Injector Group “A” Supply Voltage Circuit Low
Overview:
DTC Description as per ISO standard
Fuel Injector Group “A” Supply Voltage Circuit Low.
ECU Pin Number
7
Customer Symptom
Engine hardly starts. Even after starting it stops.
Fault Effects (On Vehicle)
Disable injector 1 pulse width correction based on current measurement,
this correction is based on battery voltage and coolant temperature
Disable injector 2 pulse width correction based on current measurement,
this correction is based on battery voltage and coolant temperature
Disable injector 3 pulse width correction based on current measurement,
this correction is based on battery voltage and coolant temperature
Disable discharge on injector 1
Disable discharge on injector 2
Disable discharge on injector 3
Disable RPC trim fault detection
Disable injector 1
Disable injector 2
Disable injector 3
Disable cylinder balancing strategy
Disable high pressure leak detection strategy
Lamp Status (If Any)
CE lamp is ON
Fault Detection Condition
This DTC gets logged if any (injector 1, 2, 3,4) Injector high side is short
circuited to ground / EMS ecu pin 7 is shorted to GND.
Normal Operating Condition
No Faults related to Fuel Injectors
Probable Trouble Area
Injector Bank, EMS ECU, Grounding points, Wiring harness connections
between Injectors and EMS ECU
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.