NEXON EV SERVICE MANUAL

NEXON EV

X114H: DTC Troubleshooting Document for BMS

Version: 3.0

Date: 01

July 2020

This document must not be used in anyway, such as copying and redistributing to third parties, without the consent of author.

P1234 - 16:- BMS power supply low fault - circuit voltage below threshold

Overview:

ISO Code

P1234 - 16

Customer Symptom

Vehicle cannot be cranked

Fault Effects (On Vehicle)

LV Battery voltage is low

Lamp Status (If Any)

HV Fault alarm

Fault occurrence scenario(In the order of

probability)

LV Battery voltage <9 V

Normal Operating Condition

LV Battery voltage is around 12V

Probable Trouble Area

Low voltage supply / DC-DC converter

Healing Condition

Re-igniting the vehicle

Component Details:

LV battery is required to supply a minimum of 9V to the BMS for BMS wakeup. If the LV voltage is below

this, the BMS will not wake up and the pack cannot be cranked.

Preliminary Checks:

Ensure the vehicle is parked and not in charging.

Ensure that the vehicle is in ignition ON condition.

Inspection Method: -

Check whether the LV battery voltage is around 12 V.

If LV is 12V, then check the battery supply across pin A, C in lv connector.

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 rectification, ensure the following points by referring to BMS DID list using TML diagnostic tool

before handing over to customer.

1) Read Parameter 3413 (BMS_InsulationResValue) to confirm that value is more than 500Ω/V.

2) If not replace the battery pack.