NEXON 3.0 EV DTC Troubleshooting Document for VCU Version: 2.0 Date: 22-Sep-2023 Copyright © TATA MOTORS Ltd. This document must not be used in anyway, such as copying and redistributing to third parties, without the consent of author. P308B - 68: - High Mismatch in requested torque from VECU and E-drive feedback Torque - event information ISO Code P308B - 68 Customer Symptom Drive to neutral Fault Effects (On Vehicle) If vehicle is in driving condition, then it will go from drive to neutral Lamp Status (If Any) HV critical telltale blinking Fault Detection Condition If requested torque from VCU to E-drive and output torque delivered from E-drive to VCU has HIGH mismatch Normal Operating Condition E-drive output torque and VCU desired torque are inline Probable Trouble Area E-drive system Healing Condition Vehicle shutdown and ignition ON Component Details: E-drive system consists of Electric motor, Motor Controller Unit and Gear-Box. It draws power from the HV battery and converts that electric power into kinetic energy which in turn helps to move the vehicle. During braking, vehicle kinetic energy converts in to electric energy. Preliminary Checks: a) Check HV connections of the E-drive terminal are properly connected b) LV Battery voltage c) Check for the proper terminal connection of the 12V LV Battery d) Check for any E-drive DTCs Trouble Shooting: - This DTC is indication for functional safety related to E-drive. E-drive DTC and its parameters need to be checked for root cause. DTC’s confirmation: - NA Circuit Schematic Diagram: NA
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