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. P0563 - 17: - Battery voltage at VECU - Circuit voltage above threshold Overview: ISO Code P0563 - 17 Customer Symptom Vehicle may not respond as per the inputs given by driver Fault Effects (On Vehicle) Vehicle Electronic Control Unit (VECU) may be nonresponsive for some or all functions on vehicle Lamp Status (If Any) NA Fault Detection Condition As per Supplier strategy, LV Voltage received at VCU supply is >16V Normal Operating Condition VECU functions normally for vehicle drivability. Probable Trouble Area VECU supply Harness Vehicle LV Battery Healing Condition NA Component Details: Vehicle Electronic Control Unit (VECU) is responsible to control the Powertrain components as per the inputs received from user/driver for vehicle drivability. Preliminary Checks: LV battery faulty Loose connection of LV wiring harness between VCU and LV battery Damage to LV wiring harness connections between VCU and LV battery Trouble Shooting: - Step No. Description Check point If Yes If No 1. Check Continuity between EVCU's supply pins and Battery terminals Check continuity between EVCU's supply pin C776A-4,5,6 and battery positive terminal and continuity between EVCU's ground pin C776A-2,3 and battery negative terminal Problem is in EVCU connector or supply. Problem is in wiring harness between Battery and EVCU Action: Repair harness DTC’s confirmation: - After rectification, read DTC using TML diagnostic tool and clear the DTC Ensure no DTC is in defect/confirmed state before handing over to customer.
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