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. ID and Go to step 1 4 Read the vehicle parameter - Battery cooling pump PWM Duty cycle (DID No: 3437) Check whether value is 93. Let the pump to run for 1min and Go to step 5. Go to step 1 5 Check if pump is running. If pump stops abruptly, go to step 1. Repeat the process 3 times Check if pump is running okay If the pump is following the request, conclude that Issue is resolved Replace BCS Pump Removed the LV battery connection Step No. Description Check point If Yes If No 5. Remove VCU side and Pump side LV connectors Check if there is continuity between these connectors Pin C776B Pin 8 and C778 Pin 2 No problem in the wiring between the Pump connector and VCU connector. Go to step 2 Problem is in wiring harness between Pump Valve and VCU Action: replace Wiring harness 6. If there are any inline connectors, remove each of them Check if there is continuity between consecutive connectors No problem in wiring between the inline connectors Go to step 4 Problem is in wiring harness between Pump and VCU. Check if fuse is okay. Action: replace Wiring harness/fuse 7. Observe the pin on the VCU side Check for C776B Pin 8 pin backout on the VECU side Problem in VCU connector or VCU.
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