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. Step No. Description Check point If Yes If No 1. Remove the LV connector of relay Check continuity between supply pin and LSD pin of relay Go to Step 2 Problem is in the relay. Action: Replace the relay and Go to step 1. 2. Remove VCU side and relay side LV connectors Check if there is continuity between these connectors No problem in the wiring between the relay connector and VCU connector. Go to Step 3 Issue is between the relay to VCU wiring harness Action: replace wiring harness 3. 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 Issue is between the relay to VCU wiring harness inline wiring harness Action: replace wiring harness 4. Remove the VCU connector. Check if there is a continuity between A10 Pin No. of VCU and the ground (Chassis). Problem in VCU connector or VCU. (Change VCU connector or VCU) TBD Action: Go to step 4
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