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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.
U1302 - 87:- BMS host lost communication with slave –missing message
Overview:
ISO Code
U1302 - 87
Customer Symptom
Vehicle will not crank
Fault Effects (On Vehicle)
No drive
No charging
Lamp Status (If Any)
HV fault on cluster
Fault occurrence scenario
(In the order of probability)
Any operation
Normal Operating Condition
No fault
Probable Trouble Area
Internal communication of BMS
Healing Condition
NA
System Details:
Slave hardware is located internal to the pack and communicates to host also internal to the pack. This
communication is not supposed to be lost throughout pack life.
Preliminary Checks:
4)
Ensure the vehicle is parked, not in charging and that the vehicle is in ignition ON condition
5)
Check the LV battery voltage. It should be atleast greater than 10V.
6)
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 –
U1302 - 87
Rectification Action:
4)
If DTC is appearing in real time, clear DTC information through service tool
5)
If DTC is not appearing in real-time but has only occurred before, store the snapshot data. store the
snapshot data.
6)
Clear the DTC information on the respective DTC ID.
DTC’s confirmation:
After clearing, ensure the following points by referring to BMS DTC list.
5)
Read DTC ID –
U1302 - 87
for the existence of DTC information.