Q501 4 Cylinder MT Application DTC Troubleshooting Data Version: 0.1 Date: 21-Sep-2018 Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta Checked By: Yogesh Jadhav Approved By: Satish Kumar P Page: 641 of 1052 Copyright © 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. P049D-22: EGR “A” Control Position Exceeded Learning Limit – EGR high pressure valve positive position deviation (signal above upper limit) Overview: DTC Description (User Friendly) EGR high pressure valve positive position deviation (signal above upper limit) ECU Pin Number A067, A088, A040, A079, A078 Customer Symptom MIL ON, CEL OFF. Increased fuel consumption Fault Effects (On Vehicle) Decreased Engine Performance, Increased fuel consumption. Lamp Status (If Any) MIL ON, CEL OFF Fault Detection Condition (Root cause) Positive control deviation is detected if control deviation > 11.99 mm Normal Operating Condition No fault Probable Trouble Area EGR valve fouled EGR Valve Healing Condition Rectify the error Clear through diagnostic tool Ignition OFF & ON 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: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above Table. If yes, go ahead with next steps. If not, check for other DTC’s presence. 2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with respect to earlier issue closure.\ 3. Check for any leakages in EGR flow path. 4. Check whether the EGR valve is physically damaged 5. Check whether the EGR valve is fouling with any other component. 6. Check for damage of pins at ECU connector. Trouble Shooting: Step Checks IF YES IF NO 1 Run the EGR High Pressure DC Motor Test Routine. Is the Routine Result – OK? Go to Next Step Rectify the wiring Harness connections between EGR Valve and EMS ECU. Repeat the Routine Test again. If the Routine result is negative, then call hotline for
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