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: 637 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. P042E-72: EGR “A” Control stuck open – EGR high pressure valve actuator stuck open Overview: DTC Description (User Friendly) EGR high pressure valve actuator stuck open ECU Pin Number A067, A088, A040, A079, A078 Customer Symptom MIL ON, CEL OFF. Increased fuel consumption Fault Effects (On Vehicle) Slight rough Idle. Lamp Status (If Any) MIL ON, CEL OFF Fault Detection Condition (Root cause) The error condition is tested, when duty cycle has reached the maximum value and finished when 5 sec is elapsed (−> PUSH phase is finished). It is tested only once while EGR valve in CLOSE position. EGR DC Motor measured position > 6.99 mm Normal Operating Condition No fault Probable Trouble Area 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 mechanical damage of EGR valve
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