NEXON 2.0 EV DTC Troubleshooting Document for VCU Version: 1.0 draft Date: 31-Jan-2022 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. 17 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 Problem may be in VCU sensing circuit Problem is in AC compressor to Edrive wiring harness Action: Change AC compressor to E-drive wiring harness 18 Remove AC compressor side LV connector Check for continuity between C447B-4 and C447B-5 of AC compressor (on E compressor side LV connector) No problem in HVIL wiring of AC compressor Go to Step 16 AC compressor inside HVIL is broken. Action: Check if AC compressor HV connector is connected Still problem persists replace AC compressor 19 Remove AC compressor side LV connector On AC compressor side LV connector check continuity of pin C447B-4 to chassis ground if the VECU parameter Vehicle HVIL Sense PWM dutycycle value is 0 or check continuity of pin C447B-4 to battery supply if the VECU parameter Vehicle HVIL Sense PWM dutycycle value is 100 Replace the AC compressor side LV connector Go to step 20
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