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NEXON EV
X114H
DTC Troubleshooting Data
Version: 3.0
Date: 27-May-2020
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88
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.
U007388:- OBC external CAN bus Off
Overview:
ISO Code (If applicable)
U007388
Customer Symptom
HV battery charging will stop.
Fault Effect (On Vehicle)
OBC will stop charging HV battery
Lamp Status (If Any)
NA
DTC Detection Condition
This DTC gets logged due to OBC external CAN connection status
error
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.
.
Pre-Check Points:
KL 30
12V LV supply to OBC
KL 31
LV/Chassis ground to OBC
a) Check for 12V LV Battery Voltage is with in the range ( 7.5V to 14V)
b) Check for OBC CAN pins in LV connector ( CAN H – pin A4 CAN L – pin B4 ) for any damage or backout.
c) Check for equivalent resistance between CAN H & CAN L to be 60Ω
d) Check for voltage between CAN H & CAN L to be 2.5V
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 U007388
is present?
Go to step 2.
Repair complete.
2
Remove the LV connector of OBC.
Check if there is continuity between
OBC signal connector pin A4 (CAN H)
and VCU pin 101. OBC signal connector
pin B4(CAN L) and VCU pin 102.
Is there proper
continuity?
Replace OBC.
Replace the
pins/terminals or replace
the LV harness and
replace OBC.
Go to step 1
On-Board charger
230V AC supply
HV Battery
LV signal connector