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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: 248 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.
P0490: EGR Solenoid Valve EVRV Control – Short Circuit to Battery Positive
Overview:
DTC Description as per ISO standard
Exhaust Gas Reci
rculation Control Circuit “A” High
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 SC to Supply is detected at EMS ecu EGR valve
drive pin.
Normal Operating Condition
No Faults related to EGR valve drive
Probable Trouble Area
Grounding points, Wiring harness connections btw EGR valve and EMS
ecu.
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.