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. 2 Remove VCU side and Solenoid side LV connectors Check if there is continuity between supply pin and LSD pin of harness side connector Problem in the wiring between the Solenoid connector and VCU connector. Go to Step 3 3 If there are any inline connectors, remove each of them Check if there is continuity between supply pin and LSD pin of consecutive connectors Problem in wiring between the inline connectors Action: change LV wiring harness connector and repeat step 3 Go to Step 4 4 Check if power supply pin short with Solenoid enable pin C758-2 Check if there is continuity between VCU supply C758-1 and LSD pin in harness side VCU connector C758-2 Problem is in VCU side LV wiring harness connector Action: change LV wiring harness connector and repeat step 4 Go to step 5 5 Remove the VCU connector. Check if there is a continuity between LSD pin C776B-A03 of VCU and the VCU supply pin Problem in VCU connector or VCU. (Change VCU connector or VCU) Action: Go to step 5 DTC’s confirmation: - After rectification, send Clear the DTC command by using TML diagnostic tool. Ensure no DTC is in defect/ confirmed state before handing over to customer. To verify operation of solenoid valve using TML diagnostic tool, ensure vehicle is in ignition mode, vehicle is stationary and LV battery voltage is >11V. Send command to open and close cabin solenoid valve and read back the parameter value to ensure command is sent. Parameter Name: Cabin cooling solenoid valve On Cmd (DID No: 344C)
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