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: 100 of 202 B1F3F-54:- Fresh Air/RECIRC Drive Motor – Missing calibration; ISO Code B1F3F- 54 Customer Symptom No air selection control (manual or automatic) Fault Effects (On Vehicle) The motor is blocked and its motion toward either end is not possible Lamp Status (If Any) 1.On First power up if calibration fails then It has to update the default values from NVM. 2.After first successful calibration, If Calibration fails Subsequently then Controller should load last saved calibration values from NVM. 3.Controller will retry Calibration process in Next ignition cycle untill it gets successful. Fault Detection Condition Fresh/RECIRC Door Control Motor Calibration Fault Normal Operating Condition With the Fresh/RECIRC feedback line connected to the harness and with Ignition ON, check the voltage between blue connector pin no 7 & ground or 23 & ground. The voltage range should be in between 0.4 to 4.47 V Probable Trouble Area Motor learning is not accomplished because of 1) Shorting of Motor drive to battery or ground 2) Motor is stuck while calibrating 3) System over/under voltage during calibration 4) Motor feedback fault short to battery or ground Healing Condition Check the mechanical mountings and fitment of camshaft placed on the actuators Component Details: The recirculation/fresh air selector door actuator motor controls the position of the door which allows fresh air or recirculation air, or a combination of the two, into the vehicle. The motor is mounted on the recirculation /fresh air duct. Preliminary Checks: Switch On the IGN & perform the following check. 1) Connect the Diagnostics tool & check the DTC fault code 2) If the fault code exists, refer the corrective actions
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