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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.
P1238 - 16:- BMS_PrechargeFaultAlarm - circuit voltage below threshold
Overview:
ISO Code
P1238 - 16
Customer Symptom
Vehicle cannot be cranked
Fault Effects (On Vehicle)
Battery will be non functional
Lamp Status (If Any)
HV Fault alarm
Fault occurrence scenario(In the order of
probability)
Battery will be disconnected
Normal Operating Condition
_
Probable Trouble Area
Precharging circuit internal to battery
Healing Condition
NA
Component Details:
Precharge relay closes the contactor based on HVIL detect and when the circuitry of the pack is complete
and ready to discharge or charge.
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 –
P1238-16
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 –
P1238-16
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 –
P1238-16
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