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NEXON EV
X114H
DTC Troubleshooting Data
Version: 3.0
Date: 27-May-2020
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91
Author: K Tejaswini Manasa/ Navya Krishnan/Gaurav Jha
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.
U140088:- OBC internal CAN bus off
Overview:
ISO Code (If applicable)
U140088
Customer Symptom
NA
Fault Effect (On Vehicle)
OBC will stop charging HV battery
Lamp Status (If Any)
NA
DTC Detection Condition
This DTC gets logged when OBC internal CAN connection is lost.
Normal Operating Condition
CAN connection is normal.
Probable Trouble Area
CAN circuit is not connected.
Healing Condition
Disconnect the gun and connect back after VCU sleep
Write up for
the system:-
The on-board charger (OBC) takes AC input and converts it to direct current to charge a HV battery. The LV supply of OBC
is from 12V battery. It requires AC HV supply voltage of 230V, 50Hz to charge the HV battery. Without the LV supply
charging is not possible. OBC communicates other ECU through CAN.
Pre-Check Points:
KL 30
12V LV supply to OBC
KL 31
LV/Chassis ground to OBC
a) Check for proper terminal connection of 12V LV Battery
b) Check for 12V LV Battery Voltage is with in the range ( 7.5V to 14V)
TroubleShooting:-
Flow Diagram or table format for diagnosing the fault code
Step no
.
Description
Check Point
if YES
if NO
1
Connect the Charging Gun & switch ON
the AC supply. check for the fault code.
Fault code U140088
is present?
Replace OBC.
Repair complete.
DTC
’
s
confirmation:-
After rectification, ensure the following points by referring OBC parameters using TML diagnostic tool before
handing over to customer.
On-Board charger
230V AC supply
HV Battery
LV signal connector