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. P3033 – 86: - Traction Cooling Pump - signal invalid Overview: ISO Code P3033 - 86 Customer Symptom Coolant pump not working Fault Effects (On Vehicle) No coolant circulation in traction system- E-drive, DCDC, OBC. May lead to subsequent failure of over- temperature in traction system components during operation of driving/charging. Lamp Status (If Any) Service Indicator Lamp is ON, on the cluster If temperature of traction system is reached above operable threshold, high temperature alert for motor is seen on cluster. Fault Detection Condition As per Bosch base software, wrong PWM pattern at the Traction cooling pump Normal Operating Condition Low voltage battery voltage between 8V – 14V. Recommended coolant present until prescribed level of coolant tank. Pump operated at requested duty cycle. Probable Trouble Area 1. Coolant not present in the TCS coolant tank 2. Leakage in coolant line 3. No/improper deaeration of coolant line Healing Condition 1. Fill the coolant in TCS reservoir as per procedure 2. Deaerate the cooling system as per procedure 3. POR (Power-On Reset, i.e. remove the negative terminal of LV battery for 2s) 4. Adjust the Traction cooling pump PWM Duty Cycle as per troubleshooting table Component Details: The TCS pump operates on LV supply. It has the following electrical connections: Switched supply voltage (+ve) UPump, Input signal / diagnosis connection (S = PWM) and Ground (terminal 31, GND, -ve).
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