Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 226 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 Step 4 Check whether the fault is triggered only in foot off. If so, perform SPC and check. If not resolved perform injector back leak test using Delphi DDS tool and replace faulty injector. - Step 5 Perform hydraulic test using Delphi DDS service and IMV buzzing test using TML tool to check IMV is stuck or IMV electric loose connection problem is present - Step 6 Check for continuity between rail pressure sensor - Step 7 Check the IMV and rail pressure sensor connector physically - Step 8 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 on common rail is faulty If rail pressure feedback is above 2200 bar, replace rail. 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 Verification condition: Drive the vehicle in highway condition in 3rd, 4th gear in high acceleration for 15 mins. Component Details: Inlet Metering Unit (IMV) is used to control pressure inside the rail. The IMV delivers metered fuel quantity to high pressure pump. High-pressure pump delivers fuel to common rail. The IMV governing is done by ECU based on the demand to maintain the required rail pressure. The Rail Pressure Sensor is used to determine the actual rail pressure. That value is needed for high-pressure control, engine protection and injection control. The sensor is mounted on the rail. Circuit Schematic Diagram:
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