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. Battery cooling pump PWM Duty cycle) at 50% dutycycle i.e. (0x32 hex) 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 ID and Go to step 1 4 Read the vehicle parameter - Battery cooling pump PWM Duty cycle (DID No: 3437) Check whether value is 93. Let the pump to run for 1min and Go to step 5. Go to step 1 5 Check if pump is running. If pump stops abruptly, go to step 1. Repeat the process 3 times Check if pump is running okay If the pump is following the request, conclude that Issue is resolved Replace BCS Pump DTC’s confirmation: A diagnostic message will be sent after the third recognized dry run. Since sending the Lifebeat has to be finished before, the first diagnostic message will be started up to 5s later. Lifebeat is sent when there is no error/event detection or when the pump is not running. Sending the diagnostic message ends after a 5s error-free pump run. A diagnostic message is only sent if pump operation is required and will be sent at least 5 times. The PWM line (diagnosis) on the pump provides the following status information.
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