Nexon EV Instrument Cluster DTC Troubleshooting Data Version: 1.1 Date: 13-July-2021 Author: Deepak Pujari Page: 48 of 108 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. Trouble Shooting:- Start Read IVN DTCs in IPC If bus off and/or error passive DTC is logged in IPC in current state? No (In history) 1.Remove IPC ECU from vehicle wiring harness. 2.Measure the resistance between following lines in IPC vehicle side wiring harness. CANH &CANL,CANH & Ground, CANL & Battery ,CANH &Battery and CANL &Ground. Is resistance >10ohm ? Check the resistance between CANH(pin no.6) and CANL(pin no.5) of IPC connector in vehicle wiring harness.(with EMS connected on vehicle) Clear DTC Stop There is short circuit failure in between those two lines Do necessary repair in the harness Yes Yes No Is resistance ≠120ohm ? Yes Check the continuity between CANH(pin no.6) &CANL(pin no.5) lines of IPC and EMS vehicle side connector Do necessary repair in the harness No (120ohm) U0028-13 -Vehicle Communication Bus A-open circuit AND/OR U0028-88 -Vehicle Communication Bus A-Bus off
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