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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.
P120C - 17:- BMS total voltage high third level alarm - circuit voltage above threshold
Overview:
ISO Code
P120C - 17
Customer Symptom
Vehicle not charging
Fault Effects (On Vehicle)
Vehicle operation stops, Battery pack is disconnected
Lamp Status (If Any)
HV Fault on cluster
Fault occurrence scenario
(
In the order of probability
)
1.Charging not stopped by VCU
2.Heavy and continuous braking
Normal Operating Condition
No fault
Probable Trouble Area
Internal to battery pack
Software bug in VCU
Software bug in BMS
Healing Condition
Charging stop
System Details:
Total battery voltage is detected by the BMS internally and the value of the voltage is populated in
diagnostics through DID parameter
3400
.
Preliminary Checks:
1)
Ensure the vehicle is parked and not in charging
2)
Ensure that the vehicle is in ignition ON condition
Inspection Method:
Connect the tool and communicate to the battery pack as instructed through APPENDIX-C
Read DTC information of DTC ID –
P120C-17
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.
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 –
P120C-17
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 –
P120C-17
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