Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 429 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 5 Check for Leakage in High Pressure Circuit. Arrest it, if leaking - Step 6 Check the IMV physically for any damage - Step 7 If the issue is in foot off and foot on also then it is due to IMV. Perform hydraulic test using Delphi DDS tool if test fails replace FIP. - Step 8 If the issue is seen only in foot off then it is due to improper RVD (injector problem). Perform SPC check problem is resolved. If not perform injector back leak test using Delphi DDS tool and if test fail, replace injector If 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 Verification condition: 1. Drive the vehicle in highway condition for 15 mins. 2. Verify in normal idle to free acceleration in neutral gear. 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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