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. P3028 - 12: - Cabin cooling Evaporator solenoid valve activation line - circuit short to battery Overview: ISO Code P3028- 12 Customer Symptom Cabin Cooling does not take place even if AC is ON leading to passenger discomfort. Fault Effects (On Vehicle) Cabin cooling does not occur even if AC is ON. Lamp Status (If Any) No Lamp Fault Detection Condition Short circuit of Cabin cooling Evaporator solenoid valve activation line to Battery 12V Normal Operating Condition Solenoid valve will open and close depending on the input received from the VCU Probable Trouble Area LV wiring harness Solenoid valve LV connection Powertrain VCU connector Healing Condition If DTC trigger condition is healed, DTC is present only in memory Component Details: Cabin cooling Evaporator solenoid valve receives electrical input from VCU and for opening and closing of solenoid valve. Preliminary Checks: Loose connection of LV wiring harness between VCU and actuator Damage to LV wiring harness connections between VCU and actuator Trouble Shooting: - 1. Remove the LV battery connections. Step No. Description Check point If Yes If No 1 Remove the LV connector of Solenoid Check continuity between supply pin and LSD pin of Solenoid LV connector Pin 1 and 2 Problem is in the Solenoid. Action: Replace the Solenoid and Go to step 1. Go to Step 2
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