Gravitas FATC Gen 3 DTC Troubleshooting Data Version: 1.0 Date: 15-July-2023 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. Author: ERC Page: 291 of 301 ISO Code U1622-81 Customer Symptom Some or all functionality may be lost Fault Effects (On Vehicle) Remote AC feature might get affected Lamp Status (If Any) HVAC uses default data values Fault Detection Condition Invalid Data Received From vehicle Control Unit - Invalid Serial Data Received Normal Operating Condition VCU ECU sends correct data in normal condition. Probable Trouble Area Incorrect data received from VCU. Healing Condition After rectifying relevant functional failures in the VCU ECU Trouble Shooting:- U1622-81-Invalid Data Received From VCU
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