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: 11 of 202 B1F23-11:- Evaporator Temperature Sensor Signal - Circuit Short to Ground; ISO Code B1F23- 11 Customer Symptom No cooling Fault Effects (On Vehicle) Evaporator temperature cannot be evaluated, hence cooling cannot be achieved Lamp Status (If Any) AC shall be OFF, Evaporator sensor default value shall be taken as OAT if Air inlet is Fresh / Incar Temp id Air inlet is Recirc Fault Detection Condition Evaporator Temperature Sensor Circuit - Circuit Short to Ground Normal Operating Condition Open Sensor connection and measure voltage between the terminals of the wiring connector (Signal and GND) to check if it measures 4-5V. Probable Trouble Area The sensor wiring is shorted to ground Healing Condition 1) If the values seen on the diagnostics tool in read ECU parameters is not getting updated then replace the sensor 2) If there is a continuity between the sensor signal and ground lines correct the wiring harness (wiring harness short to ground) Component Details: Evaporator temperature sensor is used to measure the evaporator core temperature .The evaporator cools the refrigerant in the HVAC system .Since the evaporator core operates at temperatures very close to 0 DegC, it is important to have an accurate and robust thermistor to measure its temperature to prevent the core from freezing. A frozen core could result in costly damage to the evaporator core and diminished HVAC operation so that the cabin temperature can no longer be controlled Preliminary Checks: 1. Switch On Ignition. Check sensor and its connector located at center position of lower case of the HVAC unit. 2. Read Evaporator Temperature Evaporator Temperature Sensor Signal Input sensor ECU from the diagnostic tool
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