NEXON 3.0 EV DTC Troubleshooting Document for VCU Version: 2.0 Date: 22-Sep-2023 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. P3086 - 68: - Difference in High voltage between PDU and HV battery - event information ISO Code P3086 - 68 Customer Symptom HV critical Alert Lamp ON Fault Effects (On Vehicle) Vehicle may not crank after charging cycle. In normal running condition it will get cranked and will be drivable with HV lamp On Lamp Status (If Any) HV critical Alert Lamp ON Fault Detection Condition No HV voltage CAN signal received to VCU from both DC-DC and Compressor in vehicle crank/charging state Normal Operating Condition HV voltage signal received to VCU via CAN signal from DC-DC and Compressor Probable Trouble Area DCDC CAN message time-out Compressor CAN message time-out DCDC and Compressor internal error HV cable connecting DC-DC converter to 3IN1 COMBO HV cable connecting compressor to 3IN1 COMBO HV fuse of DC-DC inside 3IN1 COMBO HV fuse of compressor inside 3IN1 COMBO Healing Condition If the fault condition is not present and VCU sleep cycle is complete (Vehicle off and in locked state for > 2 mins) Component Details: 3in1 combo - PDU is used to connect other High voltage systems to HV battery. DC-DC converter and Compressor units are connected via HV cables to the 3IN1 COMBO which is connected to HV battery. Preliminary Checks: Check for both 1 and 2 conditions are satisfied 1. Check if following conditions are satisfied a. DC-DC CAN message timeout happened - check for DC-DC DTCs in confirmed state- Check DC-DC Converter LV Connectors for pin backout or connector damage
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