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. Preliminary Checks: 1. Check for design intended LV Battery. Voltage should be in range of 8V – 14V 2. Check if coolant is present until prescribed level of coolant tank. 3. Check for any abnormalities such as damage/short circuit in wire harness and LV connectors Troubleshooting: Step Description Check point If Yes If No 1 Check whether the vehicle is in Ignition State, vehicle speed is 0 and LV battery voltage is >11 V. Using TML Diagnostic Service Tool give command to operate actuator: ‘Battery cooling pump PWM Duty cycle’ (DID No: 3437- Battery cooling pump PWM Duty cycle) at 50% dutycycle i.e. (0x32 hex) Confirm whether positive response is received. Go to step 2 Ensure the preconditions to be OK (Vehicle is in Ignition mode; vehicle speed is 0 and LV battery Voltage is >11 V) Check for the negative response ID and Go to step 1 2 Read the vehicle parameter - Battery cooling pump PWM Duty cycle (DID No: 3437) Check whether value is 50. Let the pump to run for 1 min and proceed to step 3 Go back to step 1 3 Change the duty cycle value – actuator command- Battery cooling pump PWM Duty cycle to 93 % (0x 5D hex) Confirm whether positive response is received. Go to step 4 Ensure the preconditions to be OK (Vehicle is in Ignition mode; vehicle speed is 0 and LV battery Voltage is >11 V) Check for the negative response
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