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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: 585 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.
P0403: EGR Solenoid Valve Control - EVRV- Circuit Open
Overview:
Description as per ISO Standard
Exhaust Gas Recirculation Control Circuit “A” Low
ECU Pin Number
45
Customer Symptom
Possible Loss of power / black smoke
Fault Effects (On Vehicle)
Possible Loss of power / black smoke
Lamp Status (If Any)
MIL lamp is on
Fault Detection Condition
This DTC gets logged if OC is detected at EGR valve drive EMS ecu pin
Normal Operating Condition
No Faults related to EGR Valve drive.
Probable Trouble Area
ECU, Grounding points, Wiring harness
Healing Condition
Clear the errors, Ignition OFF to ON, engine idle & fly-up condition
Component Details:
An incomplete burnt gas in exhaust is return to the cylinder. EGR works by recalculating a portion of an engine's exhaust
gas back to the engine cylinder. Intermixing the incoming air with recalculated exhaust gas dilutes the mix with inert gas
and in turn reduce the combustion temperatures for reducing NOx emissions.
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. Check for pin back out at EMS ecu connector or EGR valve connector.
x
Check for connector damages at EMS ECU & EGR valve.
x
Perform actuator test for EGR drive and ensure that EGR valve is activated and de-activated.