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. Restart attempts will take place after certain pause times as mentioned in figure 7. Pause time between the restart attempts 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 leak in coolant lines. 4. Check for the pump connection with VCU using LV schematic 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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