{Osprey CCM} DTC Troubleshooting Data Version: 2.0 Date: 28-Jul-17 Author: ERC Page: 36 of 244 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. B1F20-11:- Air Temperature Feedback Power Supply- Circuit Short to Ground;: ISO Code B1F20 - 11 Customer Symptom System is less responsive to user control and environmental conditions Fault Effects (On Vehicle) Motor feedback voltage will be affected and motor will not move to desired set point Lamp Status (If Any) NA Fault Detection Condition Temperature Door Control Motor Potentiometer Supply Line - Circuit short to ground Normal Operating Condition With the Temperature door Potentiometer supply line connected to the harness and with Ignition ON, check the voltage between pin no 2 of blue connector & ground of Green connector. The voltage should be constantly 5V Probable Trouble Area 1) Sensor supply wiring is open circuited 2) Sensor supply wiring is short circuited to ground Healing Condition NA Component Details: The actuator controls the position of the temperature blend door based on the voltage signal from the FATC module. Potentiometer, inside the actuator, sends a feedback signal to the controller and controller cuts off the voltage signal coming from the controller when the required door position is achieved. Preliminary Checks: Switch On the IGN & perform the following check. 1) Connect the Diagnostics tool & check the DTC fault code 2) Read ECU parameter Target Position of Temperature Door Flap and Temperature Door flap Position (Internal Value) for actual and target position of Actuator
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