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NEXON EV
X114H: DTC Troubleshooting Document for BMS
Version: 3.0
Date: 01
th
July 2020
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.
U1301 - 87:- BMS lost communication with VCU - missing message
Overview:
ISO Code
U1301 - 87
Customer Symptom
Vehicle will not crank
Fault Effects (On Vehicle)
NA
Lamp Status (If Any)
Fault occurrence scenario(In the order of
probability)
Normal Operating Condition
Probable Trouble Area
CAN communication network
Healing Condition
Re-igniting the vehcle
System Details:
BMS and VCU communicate with each other via CAN messages . The CAN wires are routed through LV
connector of traction Battery.
Preliminary Checks:
1)
Ensure the vehicle is parked, not in charging and that the vehicle is in ignition ON condition
2)
Check the LV battery voltage. It should be atleast greater than 10V.
3)
If LV battery is discharged fully below 10V, ensure to charge back the LV battery to >12V as per
respective standard procedure and re-install on vehicle.
Inspection Method:
Connect the tool and communicate to the battery pack as instructed through APPENDIX-C
Read DTC information of DTC ID –
U1301 - 87
Rectification Action:
1)
If DTC is appearing in real time, clear DTC information through service tool
2)
If DTC is not appearing in real-time but has only occurred before, store the snapshot data. store the
snapshot data.
3)
Clear the DTC information on the respective DTC ID.
DTC’s confirmation:
After clearing, ensure the following points by referring to BMS DTC list.
1)
Read DTC ID –
U1301 - 87
for the existence of DTC information.
2)
If DTC still exists, reflash the battery pack using the service tool with the latest release SW available
in PLM database.
3)
Read DTC ID –
U1301 - 87
for the existence of DTC information post flashing.
4)
If DTC still exists, the HV battery pack component has to be replaced as instructed by the respective
ECU replacement guide
Component Location & Image;Connector Location; Connector View & Information: -
APPENDIX-A