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. 3. Visually inspect 3 in 1 Combo for damage Trouble Shooting: - 1. Remove the LV battery connections. For short to Battery: Step No. Description Check point If Yes If No 1 Remove the LV connector of 3 in 1 Combo Check if there is continuity between 3 in 1 Combo-PDU connector’s input pin 12, 13 and Pin 1 Problem is in the 3 in 1 Combo. Action: Replace the PDU and Go to step 1. Go to Step 2 2 Remove the 3 in 1 Combo side LV connector Check if there is continuity between 3 in 1 Combo LV connector Pin C813-12, C813-13 and C813-1 Problem is in the wiring or the connector Action: Replace the LV connector/wiring and Go to step 2. Go to Step 3 3 Remove VCU side and 3 in 1 Combo side LV connectors Check if there is continuity between these connectors (C813 Pin-12 and C776A Pin 77) And (C813 Pin-13 and C776A Pin 16) No problem in the wiring between the 3 in 1 Combo connector and VCU connector. Problem is in the wiring or the connector Action: Replace the LV connector/wiring and go to step 4 4 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 5 5 Remove the VCU connector. Check if there is a continuity between K77 and VCU supply pin NOTE: Recheck that LV battery is Problem in VCU connector or VCU. (Change VCU connector or VCU) TBD
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