Q5/X451 FATC DTC Troubleshooting Data Version: 1.0 Date: 16-Oct-2018 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: 162 of 202 U0028-13:- Vehicle Communication Bus A-open circuit Overview: ISO Code U0028-13 Customer Symptom Reduced climate control functionality and performance. Fault Effects (On Vehicle) Reduced climate control functionality and performance. Lamp Status (If Any) 1) The HVAC outputs (motors and compressor request signal) should be functional using default data values where CAN data not available. For Default values refer the CAN communication matrix (dbc or function net file) 2) Error frames should observe on CAN bus. 3] The vehicle communication bus "A" open circuit DTC is in passive state in fault memory. 4) The HVAC outputs (motors and compressor request signal) should respond to the panel request. 5) CAN communication should be normal. Fault Detection Condition 1. HVAC connector is not connected properly or disconnected from its location 2. CAN Stub wire from HVAC connector side is disconnected. Normal Operating Condition HVAC ECU communicates properly with TML diagnostic Tool. Probable Trouble Area Disconnection of the HVAC connector Healing Condition To fix the HVAC connector correctly and Fix the wiring harness issues from HVAC side.
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