Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 222 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent Trouble Shooting Steps: Sr. No. Steps Specifications Step 1 Check whether the rail pressure sensor connector is connected properly. Remove and connect again properly - Step 2 Check for continuity between IMV sensor connector pins 1, 2 and ECU pins (B3, B5 or B6)T87, A25, respectively. - Step 3 Check for continuity between rail pressure sensor - Step 4 Check whether the fault is triggered only in foot off. If so, perform SPC and check. If problem perform back leak test using Delphi DDS tool Refer step 9 Step 5 Perform hydraulic test and IMV buzzing test using service tool to check IMV is stuck or IMV electric loose connection problem is present - Step 6 Check the IMV and rail pressure sensor connector physically - Step 7 Use the freeze frame data of the overpressure fault to know whether the rail pressure is above 2000 bar for few seconds and identify whether PLV is faulty If rail pressure feedback is above 2200 bar, replace rail. Step 8 Use the freeze frame data of the overpressure fault to know whether the rail pressure is above 2000 bar in 0% pedal. If it is in 0% pedal, then check the injector back leak lines for any clogging. Perform injector back leak test using Delphi DDS tool - Step 9 If back leak is found abnormal, perform SPCS and re perform the back-leak test. If again found abnormal, replace the injector - Associated Parameters: Parameter Label Description DID Monitoring Main injection fuel demand chkd Main injection fuel demand. FE65 Ranges from 1 mg/st to 55 mg/st based on engine load IMV current demand IMV current demanded by the ECU FE14 “IMV current demand” and “Measured current in the IMV actuator” closely matches in normal operation. Measured current in the IMV actuator IMV current feedback to the ECU FE61 State of the rail pressure control State of the rail pressure control FE63 Rail pressure control state to be noted Rail pressure error Rail pressure error FE20 Error should be less than 100 bar for normal operation Rail pressure feedback Rail pressure sensor feedback FE1 A Rail pressure feedback to be noted
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